Math &amp; money

Percentage Calculator

Work out percentages, increase, decrease and the difference between two numbers instantly, with a chart.

ROI Calculator

Calculate return on investment, net profit and the annualised return for any project.

VAT Calculator

Add VAT to an amount or extract it from a VAT-inclusive price at any rate, with a full breakdown.

Discount Calculator

Find the sale price and your saving, and work out stacked discounts correctly.

Unit Converter

Convert length, weight, temperature, area and volume units instantly.

Proportion Calculator

Solve proportions and find a missing value.

Ratio Calculator

Simplify ratios and divide quantities.

Average Calculator

Calculate mean, sum and range.

Markup Calculator

Calculate selling price, profit and margin.

Tip Calculator

Calculate the right tip and split the bill automatically among everyone at the table.

Random Number Generator

Generate one or several truly random numbers between any two values, with an optional no-repeat mode.

Articles & guides

How to Calculate Tax Percentage

Understanding tax percentages can help you estimate the amount added to a purchase or deducted from an amount. Calculating Tax…

How to Calculate Exam Percentage

Calculating your exam percentage is an easy way to understand your score relative to the maximum possible marks. Exam Percentage…

How to Calculate Salary Increase Percentage

When you receive a raise, calculating the salary increase percentage helps you understand how significant the increase actually is. Salary…

How to Calculate Percentage Change

Percentage change is a useful way to measure how much a value has increased or decreased compared with its original…

Percentage Calculator: How Percentage Calculations Work

A percentage calculator helps you solve common percentage problems without manually working through every formula. Percentages appear throughout everyday life.…

How to Calculate Percentage of Total

Calculating a percentage of a total helps determine how much one category contributes to an overall amount. This calculation appears…

How to Calculate Percentage Difference Between Two Numbers

Percentage difference helps describe how different two values are relative to their average. It can be useful when comparing measurements,…

How to Subtract a Percentage From a Number

Knowing how to subtract a percentage from a number is useful for discounts, price reductions, expense reductions, depreciation, and many…

How to Add a Percentage to a Number

Adding a percentage to a number is useful when calculating price increases, taxes, service charges, salary increases, markups, and other…

How to Calculate a Discount Percentage

Discount percentages are among the most common percentage calculations in everyday life. They help shoppers understand how much money they…

How to Calculate Percentage Decrease

Percentage decrease shows how much a value has fallen relative to its original amount. It is frequently used when analyzing…

How to Calculate Percentage Increase

Percentage increase measures how much a number has grown compared with its original value. It is commonly used for prices,…