The right calculator, right when you need it.

Percentage Calculator

Calculate a percentage of any number instantly.

Loan Calculator

Estimate monthly payments, total payment and total interest.

Salary Calculator

Convert annual salary into monthly, weekly and hourly pay.

Days Between Dates

Find the exact number of calendar days between two dates.

VAT Calculator

Add VAT to a net amount and see the tax breakdown.

Everyday

Fuel Cost Calculator

Estimate fuel required and the total cost of a trip.

Age Calculator

Calculate your exact age from your date of birth.

Discount Calculator

Find the final price and savings after a discount.

Compound Interest Calculator

Project investment growth with monthly compounding.

Profit Margin Calculator

Calculate profit, margin and markup from revenue and cost.

ROI Calculator

Measure the return and net gain on an investment.

Everyday

Electricity Cost Calculator

Estimate an appliance’s energy use and electricity cost.

Percentage Increase Calculator

Increase a value by a chosen percentage and see the exact change.

Percentage Decrease Calculator

Reduce a value by a percentage and calculate the amount removed.

Mortgage Calculator

Estimate a mortgage payment from price, down payment, rate and term.

Simple Interest Calculator

Calculate simple interest and final balance without compounding.

Hourly to Salary Calculator

Convert hourly pay into weekly, monthly and annual earnings.

Everyday

Tip Calculator

Calculate a tip, bill total and amount per person.

Education

GPA Calculator

Average course grade points to estimate a GPA on a 4.0 scale.

Education

Grade Calculator

Turn points earned and total points into a percentage grade.

Education

Final Grade Calculator

Find the exam score needed to reach a target course grade.

Average Calculator

Find the arithmetic mean of up to four numbers.

Ratio Calculator

Simplify a two-number ratio to its lowest whole-number terms.

Fraction Calculator

Add two fractions and simplify the result automatically.

BMI Calculator

Calculate BMI from height and weight, with adult screening categories and their limitations.

TDEE / Daily Calorie Calculator

Estimate daily maintenance calories from resting energy and an activity multiplier.

CPM Calculator

Calculate advertising cost per thousand impressions.

CPC Calculator

Calculate advertising cost per click from spend and clicks.

CPA Calculator

Calculate cost per acquisition from campaign spend and conversions.

ROAS Calculator

Measure revenue returned for each unit of advertising spend.

Conversion Rate Calculator

Calculate the percentage of visitors who complete a conversion.

Length Converter

Convert millimetres, centimetres, metres, kilometres, inches, feet, yards and miles.

Weight Converter

Convert milligrams, grams, kilograms, ounces, pounds and metric tonnes.

Temperature Converter

Convert temperatures between Celsius, Fahrenheit and Kelvin.

Area Converter

Convert square metres, square kilometres, square feet, acres and hectares.

Volume Converter

Convert millilitres, litres, cubic metres, US fluid ounces and US gallons.

Speed Converter

Convert metres per second, kilometres per hour, miles per hour and knots.

Data Storage Converter

Convert decimal bytes, kilobytes, megabytes, gigabytes and terabytes.

Time Unit Converter

Convert seconds, minutes, hours, days and seven-day weeks.

Pressure Converter

Convert pascals, kilopascals, bars and pounds per square inch.

Median Calculator

Find the middle value of a set of up to six numbers.

Mode Calculator

Identify the most frequent value or values in a six-number data set.

Standard Deviation Calculator

Calculate population and sample standard deviation for six values.

Percentage Difference Calculator

Compare two values using their absolute difference and average.

Circle Area Calculator

Calculate a circle’s area and circumference from its radius.

Rectangle Area Calculator

Calculate the area and perimeter of a rectangle.

Triangle Area Calculator

Calculate a triangle’s area from its base and perpendicular height.

Pythagorean Theorem Calculator

Find the hypotenuse of a right triangle from its two perpendicular sides.

Cylinder Volume Calculator

Calculate a cylinder’s volume and surface area from radius and height.

Debt-to-Income Calculator

Compare recurring monthly debt payments with gross monthly income.

Savings Goal Calculator

Estimate how many months regular contributions need to reach a savings target without interest.

Break-Even Calculator

Estimate the units and revenue needed to cover fixed and variable costs.

Freelance Rate Calculator

Estimate an hourly rate from income target, annual expenses and billable hours.

Commission Calculator

Calculate sales commission and total pay including a base amount.

Business Days Calculator

Count Monday-to-Friday dates in an inclusive range, excluding no public holidays.

Add Days to Date Calculator

Add or subtract a whole number of calendar days from a date.

Pace Calculator

Calculate running or walking pace and speed in kilometres and miles from distance and time.

Body Surface Area Calculator

Estimate body surface area using the existing Mosteller height-and-weight calculation.

BMR Calculator

Estimate resting daily energy with the Mifflin–St Jeor equation. Compare metric and imperial inputs.

Calorie Deficit Calculator

Explore a modest calorie reduction from maintenance, with clear limits and no promised weight loss.

Calorie Surplus Calculator

Compare a small energy surplus with maintenance calories for an illustrative muscle-gain scenario.

Macro Calculator

Convert a calorie budget into protein, carbohydrate and fat grams using your selected proportions.

Protein Intake Calculator

Compare an adult protein reference with a sports-nutrition range based on body weight.

Water Intake Calculator

Explore total-water reference values and how an assumed contribution from food changes beverage volume.

Ideal Weight Calculator

Find the weight interval corresponding to an adult BMI reference range—not a personal ideal.

Body Fat Calculator

Explore a BMI-based Deurenberg body-fat estimate and understand why it is not a measurement.

Lean Body Mass Calculator

Separate estimated fat and fat-free mass using body weight and an existing body-fat percentage.

Calories Burned Calculator

Estimate gross and above-rest activity energy using MET values, weight and duration.

One Rep Max Calculator

Estimate a one-repetition maximum from a completed set and view illustrative training percentages.

Steps to Calories Calculator

Turn measured walking steps, step length and duration into a rough level-walking energy estimate.