Free Online Calculators
Simple, fast, and accurate tools for finance, health, and everyday math.
I built ToolCalcs because I got tired of calculator sites that wanted my email before showing me a simple mortgage payment. Everything here is free, no sign-up required, and your data never leaves your browser. There are 157 calculators, 200+ guides, 95+ printable worksheets, and 42 tests — all using real formulas cross-checked against IRS publications, WHO standards, and Federal Reserve data. Here's my story.
Compound Interest Calculator
Calculate how your savings grow over time with compound interest. See the power of compounding with visual charts.
Loan Amortization Calculator
Generate a full loan amortization schedule. See monthly payments, interest breakdown, and payoff timeline.
Take-Home Pay Calculator
Estimate your net pay after federal and state taxes, Social Security, and Medicare deductions.
Mortgage Calculator
Calculate monthly mortgage payments including principal, interest, taxes, and insurance. Compare loan terms.
Retirement Savings Calculator
Plan your retirement by projecting savings growth. See if you are on track for your retirement goals.
Savings Goal Calculator
Find out how much you need to save each month to reach your financial goal by your target date.
Auto Loan Calculator
Calculate monthly car payments, total interest, and compare different auto loan terms and rates.
Paycheck Calculator
Estimate your paycheck after taxes and deductions. Calculate hourly, weekly, biweekly, and monthly take-home pay.
Inflation Calculator
Calculate the impact of inflation on purchasing power over time. See how prices change with CPI data.
Tax Calculator
Estimate your federal income tax for 2025. See your effective tax rate, marginal bracket, and tax breakdown.
Investment Calculator
Project investment growth with regular contributions. Compare different strategies with compound returns.
Credit Card Payoff Calculator
Find out how long it takes to pay off credit card debt. Compare minimum payments vs fixed monthly payments.
Debt-to-Income Calculator
Calculate your debt-to-income ratio to see where you stand for mortgage and loan approvals.
Net Worth Calculator
Calculate your total net worth by listing all assets and liabilities. Track your financial health over time.
Home Affordability Calculator
Find out how much house you can afford based on income, debts, down payment, and interest rate.
Rent vs Buy Calculator
Compare the true cost of renting versus buying a home over time. See which option builds more wealth.
Margin Calculator
Calculate profit margin, markup, and revenue from cost and selling price. Supports gross and net margin.
Crypto Profit Calculator
Calculate cryptocurrency investment profit or loss. Enter buy and sell prices to see your returns and ROI.
401(k) Calculator
Estimate your 401(k) balance at retirement. Factor in contributions, employer match, salary growth, and investment returns.
Student Loan Calculator
Calculate monthly student loan payments, total interest, and payoff timeline. Compare repayment plans.
Refinance Calculator
See how much you could save by refinancing your mortgage. Compare old vs new loan terms and break-even point.
ROI Calculator
Calculate return on investment from initial cost and final value. See annualized ROI and total gain or loss.
Down Payment Calculator
Calculate how much to save for a home down payment. See monthly savings goals and PMI thresholds.
Capital Gains Tax Calculator
Estimate capital gains tax on stocks, real estate, or other investments. Short-term vs long-term rates.
Break-Even Calculator
Calculate your business break-even point in units and revenue. Find contribution margin and safety margin.
Rental Yield Calculator
Calculate gross and net rental yield, cap rate, and NOI for investment properties.
DCA Calculator
Calculate dollar-cost averaging returns. See how regular monthly investments grow with compound returns.
Payroll Tax Calculator
Estimate federal income tax, Social Security, Medicare, and state tax from your salary.
FIRE Calculator
Calculate your Financial Independence number, years to retire early, and savings rate with the 4% rule.
Estate Tax Calculator
Estimate federal and state estate taxes, exemptions, and effective tax rates for estate planning.
Business Loan Calculator
Calculate monthly payments, total interest, and amortization schedule for business loans and SBA loans.
Debt Payoff Calculator
Compare snowball and avalanche methods to pay off multiple debts. See payoff timeline, total interest, and the best strategy.
Mortgage Amortization Calculator
Generate a full mortgage amortization schedule. See monthly principal and interest breakdown over the life of your loan.
Car Lease Calculator
Calculate monthly car lease payments, total lease cost, and compare leasing vs buying with a detailed cost breakdown.
Rent Affordability Calculator
Find out how much rent you can afford based on income, debts, and savings goals using the 30% rule and other methods.
BMI Calculator
Calculate your Body Mass Index and understand what your BMI means for your health.
TDEE Calculator
Find your Total Daily Energy Expenditure to plan your diet for weight loss, maintenance, or muscle gain.
Calorie Calculator
Calculate your daily calorie needs based on age, sex, height, weight, activity level, and fitness goals.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method. See your fat mass, lean mass, and fitness category.
Ideal Weight Calculator
Find your ideal body weight using four proven medical formulas. Compare results by height and frame size.
Pregnancy Due Date Calculator
Calculate your estimated due date, current pregnancy week, trimester, and key milestone dates.
Pace Calculator
Calculate running pace, speed, distance, or finish time. Plan your training for 5K, 10K, half marathon, and marathon.
Ovulation Calculator
Predict your most fertile days and ovulation date based on your menstrual cycle. Plan or prevent pregnancy naturally.
Sleep Calculator
Find the best time to sleep or wake up based on 90-minute sleep cycles. Optimize your rest for better energy.
Macro Calculator
Calculate your daily protein, carbs, and fat targets based on calories and diet goals. Customize macro splits.
Water Intake Calculator
Find out how much water you should drink daily based on weight, activity level, and climate.
Pregnancy Weight Gain Calculator
Calculate recommended pregnancy weight gain by week based on pre-pregnancy BMI. Track healthy weight targets per trimester.
Protein Intake Calculator
Calculate your daily protein needs based on body weight, activity level, and fitness goals. Includes meal planning breakdown.
BAC Calculator
Estimate your blood alcohol concentration based on drinks consumed, body weight, gender, and time elapsed.
BMR Calculator
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation. See daily calorie needs by activity level.
Calorie Deficit Calculator
Calculate your daily calorie target for weight loss using the Mifflin-St Jeor equation with safe deficit recommendations.
Percentage Calculator
Calculate percentages easily. Find what percent of a number is, percentage increase/decrease, and more.
Fraction Calculator
Add, subtract, multiply, and divide fractions. See step-by-step solutions with simplified results.
GPA Calculator
Calculate your cumulative GPA from course grades and credits. Supports standard 4.0 scale and weighted GPA.
Random Number Generator
Generate random numbers within any range. Perfect for lotteries, games, decisions, and statistical sampling.
Standard Deviation Calculator
Calculate mean, standard deviation, variance, and other statistics for any data set. Supports population and sample.
Area Calculator
Calculate the area of common shapes including circle, rectangle, triangle, trapezoid, and more with formulas.
Probability Calculator
Calculate single event, multiple event, and conditional probability. Includes permutations and combinations.
Scientific Calculator
Free online scientific calculator with trigonometry, logarithms, exponents, square roots, factorial, and more advanced math functions.
Average Calculator
Calculate mean, median, mode, and range for any set of numbers. Paste or type your data for instant descriptive statistics.
Triangle Calculator
Solve any triangle using SSS, SAS, or right triangle mode. Calculate all sides, angles, area, and perimeter with step-by-step formulas.
LCM & GCF Calculator
Find the Least Common Multiple and Greatest Common Factor of two or more numbers. Shows prime factorization and step-by-step work.
Prime Number Checker
Check if any number is prime. See prime factorization, all factors, and nearest primes instantly.
Quadratic Formula Calculator
Solve any quadratic equation. See discriminant, roots (real or complex), vertex, and axis of symmetry.
Volume Calculator
Calculate volume and surface area of sphere, cube, cylinder, cone, and rectangular prism with formulas.
Percentage Change Calculator
Calculate the percentage increase or decrease between two values. See absolute change, direction, and step-by-step formula.
Slope Calculator
Find slope, rise, run, line equation (y = mx + b), angle in degrees, and distance between two points.
Age Calculator
Calculate your exact age in years, months, and days. See your next birthday countdown and day of birth.
Date Difference Calculator
Find the exact number of days, weeks, months, and years between any two dates including business days.
Days Until Calculator
Count down the days until any future date. See weeks, months, and business days remaining.
Time Zone Converter
Convert times between world time zones instantly. See current time in any city and plan across time zones.
Business Days Calculator
Count working days between two dates, excluding weekends and US federal holidays for accurate project planning.
Time Duration Calculator
Add or subtract hours and minutes, or find the exact duration between two clock times with midnight crossing support.
Timestamp Calculator
Convert Unix timestamps to human-readable dates and vice versa. See the current epoch time updating live.
Day of Week Calculator
Find what day of the week any date falls on, plus day of year, ISO week number, and calendar facts.
Hours Calculator (Time Between)
Calculate the exact hours and minutes between two clock times. Supports AM/PM, next-day crossing, and decimal hours.
Unit Converter
Convert between units of length, weight, temperature, volume, and more. Fast and accurate conversions.
Currency Converter
Convert between world currencies with up-to-date exchange rates. Compare rates for popular currency pairs.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly. Includes cooking temperature charts and reference tables.
Cooking Measurement Converter
Convert between cups, tablespoons, teaspoons, fluid ounces, milliliters, liters, pints, quarts, and gallons for any recipe.
Length Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles instantly.
Weight Converter
Convert between milligrams, grams, kilograms, metric tons, ounces, pounds, and stones instantly.
Speed Converter
Convert between miles per hour, kilometers per hour, meters per second, feet per second, knots, and Mach.
Data Size Converter
Convert between bytes, KB, MB, GB, TB, and PB using binary 1024-based conversion. See all unit conversions at once.
Tip Calculator
Calculate tip amounts and split bills easily. Quick buttons for common tip percentages with per-person totals.
Discount Calculator
Calculate sale prices, savings amounts, and final costs after discounts and sales tax.
Hours Calculator
Calculate total work hours from time entries. Track daily hours, overtime, and weekly totals.
Square Footage Calculator
Calculate square footage for rooms, floors, walls, and yards. Estimate material costs for your project.
Gas Cost Calculator
Estimate fuel costs for any trip based on distance, gas mileage, and fuel price. Compare vehicle efficiency.
Electricity Cost Calculator
Calculate electricity usage and costs for any appliance. Estimate monthly and yearly power bills.
Word Counter
Count words, characters, sentences, and paragraphs in any text. Estimate reading and speaking time.
Dog Age Calculator
Convert your dog's age to human years using the latest veterinary science. Accounts for breed size and life stage.
Sales Tax Calculator
Calculate sales tax amount, total price, and per-item cost. Quick-select buttons for common US tax rates.
Grade Calculator
Calculate your overall course grade using simple or weighted averages. See letter grade, GPA, and what you need on the final.
Cat Age Calculator
Convert your cat's age to human years using veterinary guidelines. Includes life stage and indoor vs outdoor lifespan data.
Fuel Economy Calculator
Calculate MPG, cost per mile, L/100km equivalent, and annual fuel cost from distance driven and fuel consumed.
Age Difference Calculator
Find the exact age gap between two people in years, months, and days. Includes current ages and the half-your-age-plus-7 rule.
Hourly to Salary Calculator
Convert hourly wages to annual salary, monthly, biweekly, and weekly pay. Adjust for hours per week and weeks per year.
Love Calculator
Test your love compatibility with a fun name-based love calculator. Enter two names and see your love score.
Time Card Calculator
Calculate hours worked, overtime, and gross pay from daily clock in/out times for the entire week.
Concrete Calculator
Calculate cubic yards of concrete needed for slabs, footings, columns, and stairs. Estimate bags and cost.
Paint Calculator
Estimate gallons of paint needed for any room. Subtract doors and windows for accurate coverage.
Roofing Calculator
Estimate roofing materials including shingles, underlayment, and nails from roof dimensions and pitch.
Flooring Calculator
Calculate materials needed for hardwood, laminate, tile, vinyl, or carpet with waste factor built in.
Mulch Calculator
Calculate cubic yards of mulch, gravel, or topsoil for landscaping. Includes weight and bag estimates.
Fence Calculator
Estimate posts, rails, and pickets needed for any fence. Supports privacy, picket, and ranch styles.
Drywall Calculator
Calculate drywall sheets, joint compound, and tape for rooms. Accounts for doors and window cutouts.
Deck Calculator
Estimate decking boards, joists, posts, and hardware for your deck project with cost estimates.
Solar Panel Calculator
Calculate solar panel system ROI, payback period, and 25-year savings based on system size and local sun hours.
Gravel Calculator
Calculate tons and cubic yards of gravel needed for driveways, paths, and landscaping. Includes cost estimates by gravel type.
Stair Calculator
Calculate stair dimensions including rise, run, number of steps, and stringer length. Ensures building code compliance for safe stairs.
Tile Calculator
Calculate how many tiles you need for any room with wastage allowance, boxes needed, and cost estimates.
Zodiac Sign Calculator
Find your zodiac sign based on your birthday. Get detailed personality traits, strengths, weaknesses, and compatibility insights.
Zodiac Compatibility Calculator
Check zodiac sign compatibility for love, friendship, and work. Get a detailed compatibility score and relationship analysis.
Numerology Calculator
Calculate your Life Path Number from your birthday and discover what it reveals about your personality, strengths, and life purpose.
Angel Number Calculator
Look up the meaning of any angel number. Discover what messages the universe may be sending you through repeating numbers.
Tarot Card Reading
Get a free interactive tarot card reading. Draw cards for a Past-Present-Future spread or a single daily guidance card.
Chinese Zodiac Calculator
Find your Chinese zodiac animal and element based on your birth year. Learn about your personality traits and compatibility.
Life Insurance Calculator
Calculate how much life insurance coverage you need based on income, debts, dependents, and existing assets.
Term vs Whole Life Insurance Calculator
Compare term life vs whole life insurance costs and benefits. See which policy type saves you more money.
Auto Insurance Calculator
Estimate your car insurance premium based on coverage type, deductible, vehicle value, and driving history.
Home Insurance Calculator
Estimate your homeowners insurance cost based on home value, location, coverage level, and deductible.
Renters Insurance Calculator
Calculate how much renters insurance you need and estimate your monthly premium for personal property and liability.
Federal Income Tax Calculator
Calculate your 2026 federal income tax using current tax brackets. See your effective tax rate, marginal rate, and full tax breakdown.
Self-Employment Tax Calculator
Calculate self-employment tax (Social Security + Medicare), the SE deduction, and your total tax bill as a freelancer or contractor.
Capital Gains Tax Calculator
Estimate capital gains tax on stocks, real estate, and other assets. Compare short-term vs long-term rates by income level.
Tax Withholding Calculator
Find out if you are withholding enough from your paycheck to avoid a tax bill — or if you are over-withholding and giving the IRS a free loan.
Sales Tax Calculator
Add or remove sales tax from any price. Includes current sales tax rates for all 50 states and major cities.
Property Tax Calculator
Estimate annual property taxes based on home value and local tax rate. See how your bill breaks down and compare rates by state.
Rental Property Calculator
Analyze rental property profitability with monthly cash flow, cap rate, cash-on-cash return, and gross rental yield in one tool.
Cap Rate Calculator
Calculate the capitalization rate of any investment property. Enter NOI and property value to evaluate and compare real estate deals.
Mortgage Refinance Calculator
Calculate monthly savings, break-even point, and total interest saved when refinancing your mortgage to a lower rate.
Home Affordability Calculator
Find out how much house you can afford based on income, debts, down payment, and interest rate. See max purchase price and monthly payment.
Closing Cost Calculator
Estimate buyer and seller closing costs for your home purchase or sale. See itemized fees including title, escrow, origination, and taxes.
Real Estate ROI Calculator
Calculate total return on real estate investment including appreciation, rental income, equity paydown, and tax benefits.
Break-Even Calculator
Calculate your business break-even point in units and revenue. See contribution margin, margin of safety, and profit at any sales volume.
Profit Margin Calculator
Calculate gross margin, operating margin, and net profit margin. Convert between markup and margin percentages for any product or business.
LLC vs S-Corp Tax Calculator
Compare self-employment tax under LLC vs S-Corp structure. Find the optimal salary/distribution split and annual tax savings.
Payroll Cost Calculator
Calculate the true cost of an employee including salary, payroll taxes, benefits, and overhead. See total employer cost and cost multiplier.
SBA Loan Calculator
Calculate monthly payments and total cost for SBA 7(a) and 504 loans. Compare SBA vs conventional business loan rates and terms.
Business ROI Calculator
Calculate return on investment for any business decision — marketing, equipment, hiring, or expansion. See payback period and annualized ROI.
GPA Calculator
Calculate your weighted and unweighted GPA. Add courses, credit hours, and grades to see your cumulative and semester GPA.
College Cost Calculator
Estimate the total 4-year cost of college including tuition, room and board, books, and fees with inflation adjustments.
Student Loan Repayment Planner
Compare student loan repayment plans: Standard, Graduated, Extended, IBR, PAYE, and REPAYE. See monthly payments and total interest.
Scholarship Impact Calculator
See how scholarships and grants reduce your total college cost and student loan burden. Compare multiple award scenarios.
SAT Score Calculator
Convert SAT raw scores to scaled scores, see section breakdowns, and check your competitiveness for target colleges.
Car Payment Calculator
Calculate your monthly car payment with trade-in value, down payment, sales tax, and interest rate. Compare loan terms side by side.
Car Depreciation Calculator
Estimate how much your car will be worth over time. See year-by-year depreciation based on make, age, and mileage.
Fuel Cost Calculator
Calculate fuel costs for any trip or commute. Enter distance, fuel economy, and gas price to see total and per-mile cost.
EV vs Gas Cost Calculator
Compare the total cost of owning an electric vehicle vs a gas car. Includes purchase price, fuel, maintenance, insurance, and tax credits.
Car Affordability Calculator
Find out how much car you can afford based on your income, monthly budget, down payment, and credit score.
Total Cost of Ownership Calculator
Calculate the true 5-year cost of owning a car: loan payments, insurance, fuel, maintenance, depreciation, and registration fees.
Freelance Hourly Rate Calculator
Calculate the hourly rate you need to charge as a freelancer based on target income, business expenses, tax rate, and billable hours.
Freelance Project Pricing Calculator
Price freelance projects accurately by estimating hours, buffer time, complexity, and your hourly rate to avoid underpricing.
Self-Employment Tax Calculator
Calculate your self-employment tax (Social Security + Medicare) plus income tax estimate for freelancers, contractors, and gig workers.
Invoice Calculator
Create invoice totals with line items, sales tax, discounts, and late fees. Export calculations for freelance and small business invoicing.
Side Hustle Profit Calculator
Calculate true profit from your side hustle after accounting for taxes, expenses, time invested, and effective hourly rate.
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Reaction time, CPS, typing speed, number memory, color blindness, visual memory, and more. Challenge yourself and track your scores.
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25 toolsPrintable Worksheets
Free math, reading, language arts, and seasonal worksheets for Pre-K through 10th grade. Print unlimited copies.
95+ worksheetsPopular Tests & Quizzes
View all tests →Quick IQ Test
Test your cognitive ability with 20 timed questions. Get your estimated IQ score instantly.
Mental Age Test
Discover your psychological age based on personality, habits, and preferences.
DISC Personality Test
Find your DISC type — Dominance, Influence, Steadiness, or Conscientiousness.
Anxiety Test (GAD-7)
Clinically validated screening tool to assess your anxiety severity level.
Memory Age Test
Test your visual memory and find out your brain's memory age.
Dark Triad Test
Measure Machiavellianism, narcissism, and psychopathy traits with this psychology quiz.
Most Popular Guides
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Save thousands on investment taxes with this step-by-step guide to harvesting losses.
16 Personality Types (MBTI) Guide
Complete guide to all 16 MBTI types, the four dimensions, and what your type reveals.
Running Pace Calculator Guide
Learn the pace formula, find target paces for 5K to marathon, and hit your race goals.
How BAC Works
Understanding Blood Alcohol Concentration: the Widmark formula, legal limits, and myths.
Best High-Yield Savings Accounts 2026
Compare 10 top HYSA rates, fees, minimums, and features from leading online banks.
Asset Allocation by Age Guide
How to build the right portfolio at every decade. Stocks vs bonds ratios and rebalancing.
Telling Time Worksheets
Free printable clock worksheets for K-3. Practice reading analog clocks and digital time.
HSA vs FSA Comparison
Complete comparison: tax benefits, contribution limits, rollover rules, and which saves more.
Born In Year — How Old Am I?
Look up any birth year from 1920 to 2025. See age, generation, Chinese zodiac, and life milestones.
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Calculate how much solar panels save you per year. Covers system cost, tax credits, payback period, electricity savings, and ROI by state.
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April 14, 2026 FinanceHow Much Does Dating Cost? Average Relationship Expenses Breakdown
Average cost of dating in 2026: dinner dates, gifts, trips, and more. Full breakdown of relationship expenses by stage and tips to budget for love.
April 14, 2026 PsychologyINFJ Personality Type: The Rarest Type Explained
Everything about the INFJ personality type: traits, strengths, weaknesses, career matches, famous INFJs, and how INFJs differ from other types.
April 11, 2026 HealthHow to Start Running: A Complete Beginner Guide
Complete guide for new runners: couch-to-5K progression, proper form, shoes, nutrition, injury prevention, and a week-by-week training plan.
April 11, 2026 HealthStandard Drink Chart: How Many Drinks Is Too Many?
Understand standard drink sizes for beer, wine, and spirits. BAC estimation by weight and gender, safe drinking guidelines, and when to stop.
April 11, 2026 FinanceCapital Gains Tax Rates 2026: Short-Term vs Long-Term
Complete 2026 capital gains tax rate guide: short-term vs long-term rates by income, tax brackets, exemptions, and strategies to minimize capital gains tax.
April 11, 2026 PsychologyINTJ vs INFJ: Differences, Similarities, and Compatibility
Detailed comparison of INTJ and INFJ personality types: cognitive functions, decision-making styles, career preferences, and relationship compatibility.
April 11, 2026Why ToolCalcs?
All calculations run in your browser. Your data never leaves your device.
Use any tool instantly. No accounts, no paywalls, no premium tiers.
Every calculator uses industry-standard formulas from authoritative sources like IRS, WHO, and BLS.
We show step-by-step breakdowns so you can understand and verify every result.