Free tools · Clear methods · No sign-up

Calculate with context, not just a number.

EasyToolsCalc provides practical calculators and explains how each result is produced, so you can check it with confidence.

Browse reviewed calculators All calculators Read practical guides

Reviewed calculators

These tools include clear instructions, method, assumptions and limits.

Scientific CalculatorEvaluate arithmetic, powers, roots, logarithms and trigonometric expressions.Percentage CalculatorFind a percentage, percentage change, or the value behind a percentage.Fraction CalculatorAdd, subtract, multiply or divide fractions and simplify the result.Average CalculatorFind the mean, median, sum and range for a list of numbers.Age CalculatorCalculate an exact age in years, months and days from a date of birth.Date CalculatorFind days between dates or add and subtract days from a date.Time CalculatorAdd or subtract hours and minutes for everyday time planning.Time Duration CalculatorCalculate the exact time duration between two clock times, including overnight periods.Unit ConverterConvert common length, weight and temperature units.Discount CalculatorCalculate sale price and savings from an original price and discount rate.Split Bill CalculatorSplit a shared bill after tax and tip among a group of people.Travel Time CalculatorCalculate travel duration from distance and average speed.Simple Interest CalculatorCalculate simple interest and total amount from principal, rate and time.Compound Interest CalculatorEstimate investment growth from deposits, rate, years and compounding frequency.Loan Payment CalculatorEstimate a fixed monthly loan payment from amount, rate and term.Mortgage CalculatorEstimate a fixed-rate mortgage payment and total repayment.Salary CalculatorConvert an annual salary into monthly, weekly, daily and hourly pay.Profit Margin CalculatorCalculate profit, markup and profit margin from cost and selling price.

Guides that explain the calculation

Read the method before using an estimate for an important decision.

Practical guide

How to Calculate Percentages and Percentage Change

A practical guide to finding a percentage, a percentage increase, decrease and reverse percentage.

Read guide →Practical guide

Simple Interest vs Compound Interest: The Practical Difference

Understand the difference between simple and compound interest before using a savings or loan calculator.

Read guide →Practical guide

How Fixed Loan and Mortgage Payments Work

Learn what a fixed payment estimate includes and what it leaves out.

Read guide →Practical guide

How to Calculate Dates, Days and Time Durations

A clear method for days between dates, adding days and measuring time periods.

Read guide →Practical guide

A Practical Guide to Unit Conversions

Learn how to choose units, use conversion factors and avoid common temperature errors.

Read guide →Practical guide

How to Work Out Discounts, Sale Prices and Savings

Use discounts correctly and understand why taxes and stacked offers can change the final price.

Read guide →Practical guide

How to Split a Bill Fairly

A simple method for splitting a shared bill with tax, tip and unequal shares.

Read guide →

How we work

Calculators run in your browser. Each reviewed page explains its inputs, formula or method, and situations that can change the result. Results are informational and do not replace professional financial, legal, tax or medical advice.

Read our calculator methodology and editorial policy. If you spot a mistake or need a tool, use our feedback page.

More calculators with worked examples

Compare costs, estimate transfer times and check mathematical results with the methods explained on each page.