Free Online Calculators
119+ calculators for finance, math, health, business, and everyday life. No registration. No ads. Just results.
💰 Finance (39)
Simple Interest Calculator
Calculate simple interest on any amount
Investment Calculator
Project investment growth and returns
Savings Calculator
Plan savings with regular deposits
Mortgage Calculator
Calculate monthly mortgage payments
Loan Calculator
Calculate any loan payment and interest
Auto Loan Calculator
Calculate car loan monthly payments
Personal Loan Calculator
Calculate personal loan payments
Student Loan Calculator
Plan student loan repayment
Credit Card Payoff Calculator
Find your debt-free date
Retirement Calculator
Plan your retirement savings
401(k) Calculator
Project 401(k) growth with employer match
Roth IRA Calculator
Calculate Roth IRA tax-free growth
CD Calculator
Calculate CD interest and APY
Annuity Calculator
Calculate annuity payments and value
ROI Calculator
Calculate return on any investment
CAGR Calculator
Calculate compound annual growth rate
Dividend Calculator
Calculate dividend income and yield
FIRE Calculator
Find your financial independence number
Net Worth Calculator
Calculate your total net worth
Income Tax Calculator
Estimate federal income taxes
Salary Calculator
Convert salary between time periods
Paycheck Calculator
Calculate take-home pay after taxes
Hourly to Salary Calculator
Convert hourly wage to annual salary
Inflation Calculator
See how inflation affects your money
Amortization Calculator
Generate loan amortization schedule
Home Affordability Calculator
Find out how much house you can afford
Down Payment Calculator
Calculate home down payment savings
Rent vs Buy Calculator
Compare renting vs buying a home
Mortgage Refinance Calculator
Calculate refinance savings
Debt Payoff Calculator
Plan your path to debt freedom
Debt-to-Income Calculator
Calculate your DTI ratio
Savings Goal Calculator
Plan monthly savings for any goal
Emergency Fund Calculator
Calculate your emergency fund target
Present Value Calculator
Calculate present value of future money
Future Value Calculator
Calculate future value of investments
Bond Yield Calculator
Calculate bond yields and prices
Stock Profit Calculator
Calculate stock trading profits
DCA Calculator
Simulate dollar cost averaging
Rule of 72 Calculator
Find how fast your money doubles
🔢 Math (20)
Percentage Calculator
Calculate any percentage problem
Percentage Change Calculator
Calculate percent increase or decrease
Percentage Difference Calculator
Find percentage difference between values
Fraction Calculator
Perform operations with fractions
Fraction to Decimal Calculator
Convert fractions to decimals
Scientific Calculator
Full-featured scientific calculator
Square Root Calculator
Calculate square root of any number
Exponent Calculator
Calculate powers and exponents
Logarithm Calculator
Calculate logarithms of any base
Average Calculator
Calculate mean, median, and mode
Standard Deviation Calculator
Calculate standard deviation of data
GPA Calculator
Calculate grade point average
Random Number Generator
Generate random numbers in any range
Prime Number Calculator
Check primes and find factors
Ratio Calculator
Simplify and solve ratios
Binary Calculator
Binary conversion and arithmetic
Hex Calculator
Hexadecimal calculations and conversions
Number to Words Converter
Convert numbers to English words
LCM Calculator
Find least common multiple
GCF Calculator
Find greatest common factor
❤️ Health & Fitness (16)
BMI Calculator
Calculate your body mass index
Calorie Calculator
Find your daily calorie needs
TDEE Calculator
Calculate total daily energy expenditure
Macro Calculator
Calculate your daily macros
Protein Calculator
Calculate daily protein needs
Body Fat Calculator
Estimate your body fat percentage
Ideal Weight Calculator
Find your ideal weight range
BMR Calculator
Calculate calories burned at rest
Pregnancy Due Date Calculator
Calculate pregnancy due date
BAC Calculator
Estimate blood alcohol content
Water Intake Calculator
Calculate daily water needs
Sleep Calculator
Find your optimal sleep schedule
One Rep Max Calculator
Estimate your one-rep max
Pace Calculator
Calculate running pace and splits
Heart Rate Zone Calculator
Find your training heart rate zones
Age Calculator
Calculate exact age from birth date
🔄 Conversion (16)
Length Converter
Convert between length units
Weight Converter
Convert between weight units
Temperature Converter
Convert F, C, and Kelvin
Volume Converter
Convert between volume units
Area Converter
Convert between area units
Speed Converter
Convert between speed units
Data Storage Converter
Convert between data units
Time Converter
Convert between time units
Energy Converter
Convert between energy units
Pressure Converter
Convert between pressure units
Fuel Economy Converter
Convert fuel economy units
Angle Converter
Convert degrees, radians, gradians
Cooking Measurement Converter
Convert cooking measurements
Shoe Size Converter
Convert shoe sizes between regions
Time Zone Converter
Convert between time zones
Roman Numeral Converter
Convert Roman numerals
📊 Business (14)
Profit Margin Calculator
Calculate gross and net profit margins
Markup Calculator
Calculate markup and selling price
Discount Calculator
Calculate sale price after discount
Break Even Calculator
Find your break-even point
Sales Tax Calculator
Calculate sales tax on purchases
VAT Calculator
Calculate value added tax
Margin Calculator
Calculate margin from revenue and cost
Revenue Calculator
Calculate and forecast revenue
Invoice Calculator
Calculate invoice totals with tax
Commission Calculator
Calculate commission earnings
Depreciation Calculator
Calculate asset depreciation
Cash Flow Calculator
Analyze business cash flow
Payroll Calculator
Calculate employer payroll costs
Startup Cost Calculator
Estimate startup launch costs
🏠 Everyday (14)
Tip Calculator
Calculate tips and split bills
Date Calculator
Calculate days between dates
Time Calculator
Add and subtract time durations
Gas Cost Calculator
Calculate fuel cost for trips
Electricity Cost Calculator
Calculate electricity running costs
MPG Calculator
Calculate fuel efficiency (MPG)
Unit Price Calculator
Compare prices per unit
Grade Calculator
Calculate weighted grades
Concrete Calculator
Calculate concrete needed
Paint Calculator
Calculate gallons of paint needed
Tile Calculator
Calculate tiles needed for area
Moving Cost Calculator
Estimate moving costs
Wedding Budget Calculator
Plan wedding budget by category
Pet Cost Calculator
Calculate pet ownership costs