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Free online calculators for everyday use
Loans, mortgages, interest, and savings, bmi, calories, and wellness metrics, and more — clean design, instant results, no signup.
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Popular calculators
Featured tools — browse all 40 below
Mortgage Calculator
Full monthly housing payment with taxes, insurance, private mortgage insurance, and homeowners association dues, plus a 15- and 30-year comparison.
BMI Calculator
Body Mass Index with healthy weight range guidance.
Tip Calculator
Split the bill and calculate tip per person.
Percentage Calculator
Find percentages, increases, decreases, and differences.
Scientific Calculator
Trigonometry, logarithms, powers, and advanced math.
Calorie Calculator
Estimate daily calorie needs based on activity level.
Discount Calculator
Find sale prices and savings from any markdown.
Loan Calculator
Calculate fixed monthly payments for any term loan.
Browse by category
Find the right tool without digging through hundreds of links
Financial
Loans, mortgages, interest, and savings
Mortgage Calculator
Full monthly housing payment with taxes, insurance, private mortgage insurance, and homeowners association dues, plus a 15- and 30-year comparison.
Mortgage Affordability
The home price a 28% housing cap and a 36% debt cap can support.
Loan Calculator
Calculate fixed monthly payments for any term loan.
Compound Interest
Project investment growth with recurring contributions.
Retirement Calculator
Project your nest egg and estimated retirement income.
Auto Loan Calculator
Estimate car payments with down payment and trade-in.
Payment Calculator
Calculate loan payments by monthly, biweekly, or weekly schedule.
Sales Tax Calculator
Add tax to a price or find the pre-tax amount from a total.
Markup and Margin
Profit as a percentage of the cost, and of the selling price.
Salary Calculator
Convert between hourly wage and annual salary.
Take-Home Pay
Gross pay minus the taxes and deductions you type.
Simple Interest Calculator
Calculate interest earned on a principal over time.
Amortization Calculator
View loan payment schedule with principal and interest breakdown.
Refinance Calculator
Compare a current loan with a new rate and term, including closing costs paid up front.
Credit Card Payoff
See how long a balance takes to pay off, and the interest you pay.
Inflation Calculator
Convert dollars between years with CPI-U annual averages through 2025.
Currency Calculator
Convert money with a rate and the date of that rate.
Health & Fitness
BMI, calories, and wellness metrics
BMI Calculator
Body Mass Index with healthy weight range guidance.
Calorie Calculator
Estimate daily calorie needs based on activity level.
Pregnancy Due Date
Estimate your due date from LMP, conception, or ultrasound.
BMR Calculator
Basal metabolic rate — calories burned at rest.
Body Fat Calculator
Estimate body fat percentage using the US Navy method.
Ideal Weight Calculator
Healthy weight estimates from multiple medical formulas.
Math
Percentages, fractions, and statistics
Percentage Calculator
Find percentages, increases, decreases, and differences.
Scientific Calculator
Trigonometry, logarithms, powers, and advanced math.
GPA Calculator
Credit-weighted grade point average on a 4.0 scale.
Fraction Calculator
Add, subtract, multiply, divide, and simplify fractions.
Random Number Generator
Generate random integers or decimals in any range.
Standard Deviation
Calculate mean, variance, and standard deviation for a data set.
Grade Calculator
Find the final exam score needed to reach your target grade.
Everyday
Tips, dates, and daily utilities
Tip Calculator
Split the bill and calculate tip per person.
Discount Calculator
Find sale prices and savings from any markdown.
Unit Converter
Convert length, weight, temperature, volume, area, speed, and data.
Date Difference
Count days, weeks, and months between two dates.
Age Calculator
Exact age in years, months, and days from birth date.
Time Calculator
Add or subtract durations and clock times.
Hours Calculator
Calculate work hours between start, end, and break times.
Gas Mileage Calculator
Miles per gallon, liters per 100 km, and the cost of a trip.
Time Zone Calculator
Convert a date and time between time zones, including daylight saving.
Business Days Calculator
Count weekdays between two dates, with US federal holidays optional.