Age Calculator
Calculate exact age, total months, weeks, days and the next birthday.
Calculators
Practical number and date calculators with instant browser-local results.
Percentage Calculator
Calculate a percentage of any number instantly.
Percentage Change Calculator
Find the percentage increase or decrease between two values.
Percentage Difference Calculator
Find the symmetric percentage difference between two values.
Discount Calculator
Calculate sale price and savings from an original price and discount.
Tip Calculator
Calculate a tip, total bill and amount per person.
Average Calculator
Find the mean, sum, minimum and maximum of a number list.
Ratio Calculator
Simplify a two-number ratio to its lowest whole-number terms.
Fraction to Decimal Calculator
Convert a fraction into a decimal and percentage.
Decimal to Fraction Calculator
Convert a terminating decimal into a simplified fraction.
Unit Price Calculator
Compare package value by calculating price per unit.
Profit Margin Calculator
Calculate gross profit and margin from cost and selling price.
Markup Calculator
Calculate selling price from cost and markup percentage.
Random Number Generator
Generate an unbiased random whole number within a chosen range.
Date Difference Calculator
Calculate the exact elapsed years, months and days between two dates.
Days Between Dates Calculator
Count the exact number of calendar days between two dates.
Business Days Calculator
Count weekdays between two dates, excluding Saturdays and Sundays.
Birthday Countdown
Find how many days remain until your next birthday.
Time Duration Calculator
Calculate elapsed hours and minutes between two times.
Lux to Lumens Calculator
Calculate luminous flux in lumens from illuminance in lux and illuminated area in square metres.
GPA Calculator
Calculate a credit-weighted grade point average for a set of courses.
Win Rate Calculator
Calculate win rate from wins and losses and project the result of one more win or loss.
Easy Grader Calculator
Calculate a test percentage and missed-question count from total and correct answers.
Calorie and TDEE Calculator
Estimate adult resting energy expenditure and daily maintenance calories from age, sex, height, weight and activity.
Calorie Counter
Add foods, calories per serving and serving amounts to total a day or meal privately.
Body Fat Calculator
Estimate body fat percentage from height and circumference measurements using the U.S. Navy method.
FFMI Calculator
Estimate fat-free mass index and height-normalized FFMI from weight, height and body-fat percentage.
Lean Body Mass Calculator
Calculate lean and fat mass from body weight and a body-fat percentage you provide.
Calories Burned Calculator
Estimate activity calories from body weight, duration and a selected activity intensity.
Ideal Weight Calculator
Calculate the adult weight range corresponding to a healthy BMI from height.
Ovulation Calculator
Estimate an ovulation date and six-day fertile window from a regular menstrual cycle.
Period Calculator
Estimate the next six menstrual period start dates from a usual cycle length.
Macro Calculator
Convert a daily calorie target and macronutrient percentages into grams of protein, carbohydrate and fat.
Calorie Deficit Calculator
Calculate a percentage reduction from an estimated maintenance-calorie value.
Pregnancy Due Date Calculator
Estimate a pregnancy due date and gestational age from the first day of the last menstrual period.
IVF Due Date Calculator
Estimate a due date from a day-3 or day-5 embryo transfer date using current obstetric guidance.
Conception Date Calculator
Estimate a conception date from the first day of the last menstrual period or an established due date.
Julian Date Calculator
Convert a UTC Gregorian date and time into Julian Date, Modified Julian Date and day-of-year values.