Free online calculators

32 fast, accurate calculators with the formulas explained. Everything runs in your browser, with no sign-up and nothing sent to a server.

Health & fitness BMI, calories, body fat and pregnancy

BMI calculatorCalculate your body mass index from height and weight in metric or imperial units Calorie calculatorFind how many calories you need each day to maintain TDEE calculatorEstimate your total daily energy expenditure (TDEE) from your BMR and activity level BMR calculatorCalculate your basal metabolic rate with the Mifflin-St Jeor Body fat calculatorEstimate body fat percentage with the U Ideal weight calculatorEstimate your ideal body weight from height and sex using the Devine Pregnancy due date calculatorEstimate your baby’s due date from the first day of your last period and cycle length

Money & finance Loans, mortgages, savings and pay

Mortgage calculatorEstimate your monthly mortgage payment including principal Loan calculatorWork out the monthly payment Auto loan calculatorCalculate your monthly car payment from vehicle price Compound interest calculatorSee how an investment grows with compound interest and regular monthly contributions Savings goal calculatorFind out how long it will take to reach a savings goal with regular deposits and interest Retirement calculatorProject your retirement savings Salary to hourly calculatorConvert an annual salary to an hourly wage

Everyday math Percentages, tips, tax, GPA and conversions

Tip calculatorCalculate the tip and total for a restaurant bill Percentage calculatorCalculate X% of a number Discount calculatorWork out the sale price and how much you save from a percentage discount Sales tax calculatorAdd sales tax to a price or work backwards from a tax-inclusive total to find the pre-tax amount and the tax paid GPA calculatorCalculate your semester GPA from letter grades and credit hours on a 4 Unit converterConvert between metric and US units for length Fuel cost calculatorEstimate the fuel cost of a road trip or commute from distance

Dates & time Age, countdowns and durations

Age calculatorCalculate your exact age in years Date difference calculatorCount the days between two dates Days until calculatorCount how many days Time duration calculatorCalculate the hours and minutes between two clock times

Home & DIY Area, flooring, concrete and paint

Area calculatorFind the area of a rectangle Square footage calculatorCalculate the square footage of rooms or floors from length and width Concrete calculatorCalculate how much concrete you need for a slab Paint calculatorWork out how many gallons or liters of paint you need for a room from wall length

Dental practice KPIs for dentists and office managers

Dental production per hour calculatorCalculate dentist or hygienist production per hour and per day from total production and clinical hours Dental case acceptance rate calculatorCalculate your dental practice’s treatment case acceptance rate by number of cases and by dollar value Hygiene recall revenue calculatorEstimate yearly hygiene revenue from active patients