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Free Online Calculators

74+ free calculators for finance, health, and everyday conversions. No sign-up required. Instant results.

💰

Core Financial

11 tools
Compound Interest Calculator
See how your investments grow with compound interest
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Investment Return Calculator
Calculate returns with lump sum and monthly contributions
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Simple Interest Calculator
Calculate simple interest on loans and deposits
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Future Value Calculator
Project the future value of any investment
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Savings Calculator
Model your savings growth with compound interest
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Savings Goal Calculator
Find out how long to reach any savings target
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How Long to Save Calculator
Calculate months to reach a savings goal
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Net Worth Calculator
Calculate your total assets minus liabilities
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APY Calculator
Convert APR to APY and compare savings rates
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Inflation Calculator
See the real purchasing power of money over time
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Percentage Calculator
Calculate percentages, increases, and decreases
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🏦

Loans & Debt

10 tools
Mortgage Calculator
Monthly payment, total interest, and amortization
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Amortization Calculator
Full amortization schedule for any loan
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Loan Calculator
Personal loan payment and total cost calculator
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Auto Loan Calculator
Car loan monthly payment and interest calculator
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Loan Payoff Calculator
Find out when your loan will be paid off
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Loan Extra Payments Calculator
See how extra payments shorten your loan
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Mortgage Refinance Calculator
Calculate break-even on a mortgage refinance
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Credit Card Payoff Calculator
Payoff timeline and total interest for credit card debt
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HELOC Calculator
Home equity line of credit payment calculator
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Interest Rate Calculator
Solve for the interest rate on any loan or investment
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🔥

Retirement & FIRE

8 tools
Retirement Calculator
Project your retirement balance and income
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FIRE Calculator
Calculate your FIRE number and years to financial independence
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Coast FIRE Calculator
Find your Coast FI number — when you can stop contributing
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DCA Calculator
Dollar-cost averaging investment growth calculator
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SIP Calculator
Systematic Investment Plan return calculator
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Portfolio Calculator
Model portfolio growth across multiple assets
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ETF Calculator
ETF investment growth and fee impact calculator
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Money Longevity Calculator
How long will your retirement savings last?
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📈

Investing

9 tools
CAGR Calculator
Compound annual growth rate calculator
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ROI Calculator
Return on investment percentage calculator
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IRR Calculator
Internal rate of return for cash flow series
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Dividend Calculator
Dividend income and growth calculator
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Dividend Yield Calculator
Calculate dividend yield from price and payout
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Stock Average Calculator
Average down or up your cost basis
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Margin Calculator
Profit margin and markup calculator
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APY Calculator
Annual percentage yield calculator
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Currency Converter
Live exchange rates for 30+ currencies
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💵

Income & Budget

5 tools
Salary Calculator
Convert salary between hourly, weekly, monthly, annual
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Pay Raise Calculator
Calculate new salary after a raise or promotion
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Overtime Calculator
Overtime pay and total earnings calculator
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Tip Calculator
Split bills and calculate tips easily
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Cash Back Calculator
Compare cash back rewards across credit cards
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🏠

Real Estate

5 tools
Rental Property Calculator
Cash flow, cap rate, and ROI for rental properties
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Cap Rate Calculator
Capitalization rate for investment properties
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House Flip Calculator
Profit and ROI calculator for house flipping
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Price Per Square Foot Calculator
Compare property prices per sq ft
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MMA Calculator
Money market account return calculator
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❤️

Health & Lifestyle

4 tools
BMI Calculator
Body Mass Index — metric and imperial
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TDEE Calculator
Total Daily Energy Expenditure and calorie needs
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Age Calculator
Calculate exact age in years, months, and days
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Date Calculator
Days between dates and date arithmetic
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🔨

Home & DIY

10 tools
Square Footage Calculator
Area for rooms in any shape
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Paint Calculator
Gallons of paint needed for any room
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Flooring Calculator
Flooring material needed with waste factor
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Cubic Yards Calculator
Mulch, gravel, concrete, and topsoil volume
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Cubic Feet Calculator
Volume in cubic feet for any shape
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Gravel Calculator
Gravel and crushed stone weight and volume
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Mulch Calculator
Cubic yards of mulch for garden beds
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Asphalt Calculator
Asphalt tonnage for driveways and paths
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LED Savings Calculator
Energy and cost savings from switching to LED
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Electricity Cost Calculator
Annual electricity cost by appliance
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📐

Unit Converters

9 tools
Length Converter
mm, cm, m, km, inches, feet, yards, miles
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Weight Converter
kg, g, lbs, oz, stone, metric tons
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Temperature Converter
Celsius, Fahrenheit, Kelvin, Rankine
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Area Converter
m², ft², acres, hectares and more
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Volume Converter
Liters, gallons, cups, fl oz and more
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Speed Converter
mph, km/h, m/s, knots and more
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Time Converter
Seconds, minutes, hours, days, years
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Data Converter
Bytes, KB, MB, GB, TB — decimal and binary
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Currency Converter
Live rates for 30+ world currencies
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⚡

Automotive & Energy

3 tools
MPGe Calculator
Miles per gallon equivalent for EVs
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Miles Per kWh Calculator
EV efficiency and energy cost calculator
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CBM Calculator
Cubic metre shipping volume calculator
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