Calculators
Free online calculators for everyday math — percentages, tips, discounts, loans, simple and compound interest, BMI, dates, salary and more. Each one runs instantly in your browser and shows the formula and examples, so you can trust the result. No signup, no downloads.
Percentage Calculator
Quickly find what percent of a number is — instantly, in your browser.
Discount Calculator
See the final price after a discount and how much you save.
Profit Margin Calculator
Turn cost and selling price into profit, margin and markup.
BMI Calculator
Body Mass Index from weight and height, with category.
Age Calculator
Exact age in years, months and days from a birth date.
Loan / Monthly Payment
Estimate a fixed monthly payment from amount, rate and term.
Tip Calculator
Work out the tip and split the bill between any number of people.
Sales Tax / VAT Calculator
Add sales tax or VAT to a price and see the net, tax and gross.
Compound Interest Calculator
See how savings grow with compound interest over time.
Simple Interest Calculator
Calculate simple interest and the total from principal, rate and time.
Percentage Change Calculator
Find the percentage increase or decrease between two values.
Average (Mean) Calculator
Get the average, sum, count, min and max of a list of numbers.
Date Difference Calculator
Count the days, weeks and months between two dates.
Hours Calculator
Find how much time passes between a start and end time.
BMR & Calorie Calculator
Estimate your basal metabolic rate and daily calorie needs.
Fuel Cost Calculator
Estimate the fuel cost of a trip from distance, consumption and price.
ROI Calculator
Calculate return on investment as a percentage from cost and final value.
Unit Price Calculator
Find the price per unit to compare products of different sizes.
Running Pace Calculator
Calculate your running pace per kilometer and your speed.
Aspect Ratio Calculator
Reduce a width and height to its simplest aspect ratio.
Reverse VAT Calculator
Extract the net amount and VAT from a VAT-inclusive (gross) price.
Electricity Cost Calculator
Estimate the running cost of an appliance from its wattage and usage.
Water Intake Calculator
Estimate how much water to drink per day based on your weight.
Leap Year Checker
Check whether any year is a leap year.
Day of the Week Calculator
Find out which weekday any date falls on.
Ideal Weight Calculator
Estimate a reference ideal body weight for your height.
Hourly to Salary Calculator
Convert an hourly wage into weekly, monthly and annual pay.
Break-Even Calculator
Find how many units you must sell to cover your costs.
GCD & LCM Calculator
Find the greatest common divisor and least common multiple of two numbers.
Mortgage Calculator
Estimate the monthly payment on a home loan after a down payment.
Pythagorean Theorem Calculator
Find the hypotenuse of a right triangle from the two legs.
Circle Calculator
Calculate a circle’s area, circumference and diameter from its radius.
Fraction Simplifier
Reduce a fraction to its simplest form, with decimal and percent.
Stacked Discount Calculator
Apply two discounts in sequence and see the real effective discount.
Savings Goal Calculator
See how long it takes to reach a savings target with monthly deposits.
CAGR Calculator
Calculate the compound annual growth rate between two values.
Average Speed Calculator
Calculate average speed from distance and time.
Decimal to Fraction Converter
Convert a decimal number into a simplified fraction.
Grade Calculator
Turn a score into a percentage and letter grade.
Final Grade Calculator
Find the score you need on a final exam to hit your target grade.
Body Fat Calculator (US Navy)
Estimate body fat percentage from tape measurements (US Navy method).
Random Number Generator
Pick a random whole number in a range.
Proportion Calculator (Rule of Three)
Solve a proportion a : b = c : x for the missing value.
Scientific Notation Converter
Convert a number to and from scientific notation.
Days Until a Date (Countdown)
Count down the days from today to any future date.
TDEE Calculator
Estimate your daily calorie needs (Total Daily Energy Expenditure).
Golden Ratio Calculator
Apply the golden ratio (φ ≈ 1.618) to any size.