99% of
everyday math.
The other 1%? Ask a mathematician.
233 calculators and counting.
233 calculators
Featured calculators
Most popular
-
Online Calculator
Type a sum and get the answer: + − × ÷, brackets, powers, roots and percent. -
Currency Converter
Convert between 30 currencies at today’s European Central Bank reference rates. -
Percentage of a Number Calculator
Find X% of any number, like 20% of 85. -
Tip Calculator
Work out the tip and the total, split between everyone. e.g. Tip = 12.75 -
Mortgage Calculator
Your full monthly mortgage payment: loan, taxes, insurance, PMI and HOA. e.g. Monthly payment = 2,917.11 -
Age Calculator
Your exact age in years, months and days, and when your next birthday is. e.g. Age = 35 years -
Days Between Dates Calculator
Count the days between two dates, and see it in weeks and months too. e.g. Days between = 358 days -
BMI Calculator
Calculate body mass index in metric or imperial units. e.g. Your BMI = 22.9
Every calculator
Percentages
9 calculators
Shopping & pay
30 calculators
Shopping and everyday
- Currency Converter
- Tip
- Discount
- Sales Tax
- VAT
- Split the Bill
- Unit Price
- Price per Use
- Electric vs Gas Car Cost
- Canada Sales Tax Calculator (GST/HST)
- Cost of Owning a Car
- Stacked Discount
Pay and tax
- Salary Calculator: Hourly to Annual
- Paycheck Calculator (US)
- Federal Income Tax Calculator (US)
- Pay Raise
- Overtime Pay
- Pro Rata Salary
- UK Take-Home Pay
- UK Holiday Entitlement
- German Net Salary Calculator (Brutto Netto)
- French Net Salary Calculator (Brut to Net)
- Vacation Accrual
Working for yourself
- Self-Employment Tax Calculator (US)
- Freelance Hourly Rate
- Commission
- Markup and Margin
- Break-Even
- Late Payment Interest
- Meeting Cost
- See all
Loans & saving
59 calculators
Mortgages and renting
- Mortgage
- How Much House Can I Afford?
- Down Payment
- Rent or Buy
- Refinance
- Home Equity and LTV
- Mortgage Payoff
- Rent Split
- German Mortgage Calculator (Tilgung)
- How Much Rent Can I Afford?
- Closing Cost
- Property Tax
- Mortgage Points
- Loan-to-Value (LTV)
Loans and debt
- Loan and Mortgage Payment
- Car Loan
- Student Loan
- Credit Card Payoff
- Debt Payoff
- Balance Transfer
- Loan Amortization Schedule
- Debt-to-Income Ratio
- Car Lease vs Buy
- APR to APY
- Credit Card Interest
- How Much Car Can I Afford?
- Car Lease
- Loan Comparison
- Car Refinance
- Credit Utilization
- Car Depreciation
- Loan Interest Rate
Saving and investing
- Compound Interest
- Savings Goal
- ROI Calculator: Return on Investment
- Retirement
- 401(k) Calculator with Employer Match
- CD Calculator (Certificate of Deposit)
- Simple Interest
- Inflation
- Rule of 72
- Dividend Yield
- Present Value
- FIRE
- How Long Will My Money Last?
- Savings Interest
- Stock Profit
- Roth IRA
- ROI
- CAGR
- Crypto Profit
- Dollar-Cost Averaging
- College Savings Calculator (529)
Budgeting
- Budget Calculator (50/30/20 Rule)
- Emergency Fund
- Net Worth
- Subscription Cost
- Travel Budget
- Wedding Budget
- See all
Time & dates
22 calculators
Dates
- Days Between Dates
- Age
- Countdown to a Date
- Add or Subtract Days from a Date
- What Day of the Week Was It?
- Business Days
- Week Number
- Leap Year
- German Working Days
- Dog Age Calculator: Dog Years to Human Years
- Age Difference
- Baby Age
Hours and clocks
- Hours Between Times
- Time Zone Converter
- Timesheet Calculator: Weekly Hours
- Time Duration
- Military Time Converter (24-Hour Clock)
- Time Unit Converter
- Unix Timestamp Converter
- Speed, Distance and Time
- Road Trip Time
- Time Saved by Driving Faster
- See all
Health
25 calculators
Body and weight
- BMI
- Body Fat
- Ideal Weight
- Waist-to-Hip Ratio
- BMR and Calorie
- Child Height Predictor
Food, drink and nutrition
- Calorie Deficit
- Macro
- Protein
- Water Intake
- Goal Weight Date
Coffee, alcohol and smoking
- Blood Alcohol (BAC)
- Caffeine
- Quit Smoking Savings
Fitness and sleep
- Calories Burned
- Running Pace
- Heart Rate Zone
- Steps to Miles and Km
- One-Rep Max Calculator (1RM)
- Sleep Calculator: Bedtime and Wake-Up Time
- Race Time Predictor
Pregnancy and cycle
- Pregnancy Due Date
- Ovulation
- Period
- Conception Date
- See all
Home & DIY
36 calculators
Decorating and floors
- Paint
- Flooring and Tile
- Wallpaper
- Area
- Room Volume
- Moving Box
- Moving Cost
Building and renovating
- Concrete
- Drywall Calculator (Plasterboard)
- Brick and Block
- Roofing
- Stair
- Board Foot
Garden and outdoors
- Fence
- Deck
- Pool Volume
- Mulch, Soil and Gravel
- Grass Seed and Sod
- Plant Spacing
Energy and running costs
- Electricity Cost
- EV Charging Cost and Time
- AC Size Calculator (BTU)
- Solar Panel Payback
- Fuel Cost
- Fuel Economy Calculator (MPG and L/100 km)
- Heat Pump Savings
Kitchen
- Recipe Scaler
- Party Food
- Turkey Cooking Time
- Baking Pan Size Converter
- Coffee to Water Ratio
- Recipe Cost per Serving
- Pizza Size Calculator: Which Is the Better Deal?
- Rice to Water Ratio
- Baker’s Percentage
- Dog Food
- See all
Conversions
22 calculators
Units
- Length Converter
- Weight Converter
- Temperature Converter
- Volume Converter
- Area Converter: Square Feet, m², Acres
- Speed Converter
- Data Size Converter: MB, GB, TB
- Energy Converter: kWh, kcal, BTU, Joules
- Angle Converter: Degrees and Radians
- Pressure Converter: psi, bar, kPa
- Fuel Economy Converter (MPG to L/100 km)
- Feels Like Temperature
Heights, sizes and cooking
- Height Converter: Feet and Inches to cm
- Inch Fraction
- Shoe Size Converter: US, UK, EU
- Clothing Size Converter: US, UK, EU
- Ring Size Converter
- Paper Size Converter: A4, Letter and More
- Tire Size
- Cooking Measurement Converter
- Oven Temperature Converter: °C, °F, Gas Mark
- Bra Size
- See all
Everyday math
30 calculators
Calculators
- Online
- Scientific
- Fraction
- Average Calculator: Mean, Median, Mode
- Rule of Three
- Ratio
- Rounding
- Square Root
- Exponent
School and statistics
- Grade Calculator: Points to Percent and Letter
- GPA
- Final Grade
- Weighted Average
- Standard Deviation
- Pythagorean Theorem
- Quadratic Equation Solver
- Slope
- Circle Calculator: Area and Circumference
- Volume Calculator: Cube, Cylinder, Sphere, Cone
- Long Division Calculator with Steps
- LCM and GCF
- Triangle
Numbers and chance
- Probability and Odds
- Random Number Generator and Dice Roller
- Coin Flip
- Prime Factorization
- Scientific Notation Converter
- Binary, Hex and Decimal Converter
- Roman Numeral Converter
- Number to Words Converter
- See all
The other 1%?
Found some everyday math we don’t solve yet? Or a result that looks wrong? Tell us. Every calculator on this site started as somebody’s “there must be a calculator for this.”