Everyday Maths

Everyday Maths Calculators, Guides & Tools

Use free UK-friendly tools for percentages, VAT, discounts, tips, unit prices and ratios — simple calculators for shopping, bills, invoices and quick everyday sums.

Percentages VAT Discounts Unit prices

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Use the Everyday Maths Calculators Guides & Tools

Work out percentages in the most common ways: percentage of a number, percentage increase or decrease, percentage difference, and adding or subtracting a percentage.

% of a number Increase/decrease Add or subtract %

Example result 20% of £150 = £30 Useful for bills, discounts, price changes, VAT checks and quick comparisons. Use percentage calculator

Everyday maths calculators

Choose the tool that matches the sum you need: percentages, tips, VAT, sale discounts, unit price comparisons or ratios.

Primary tool Percentage Calculator Calculate percentages, percentage changes, percentage differences and add or subtract a percentage from a value. Bills Tip Calculator Work out a tip, total bill, bill split and tip per person. UK VAT VAT Calculator Add or remove VAT at 20%, 5%, 0% or a custom rate, with net, VAT and gross totals. Shopping Discount Calculator Calculate sale price, saving amount, stacked discounts and effective discount percentage. Compare prices Unit Price Comparison Calculator Compare two products by price per unit, saving per unit and percentage saving. Ratios Ratio Calculator Simplify ratios, scale ratios by a multiplier or split a total into ratio parts.

Common everyday maths jobs

Everyday Maths is built around practical numbers: sale prices, invoices, bills, shopping comparisons and quick percentage checks.

Check percentages quickly Use the percentage calculator for price changes, bill increases, pay examples and simple “what percent?” questions.

Add or remove VAT Use the VAT calculator for UK VAT-inclusive and VAT-exclusive prices, invoices and receipts.

Compare what is cheaper Use discount and unit price calculators to compare offers, pack sizes and sale prices before you buy.

VAT note

Removing 20% VAT from a VAT-inclusive price is not the same as subtracting 20%. At the standard UK VAT rate, divide the gross price by 1.20 to get the net price.

Everyday maths guides

Read practical guides that explain the common mistakes behind percentages, VAT, discounts and unit price comparisons.

Guide How to Calculate Percentages Without a Calculator Learn quick percentage methods for common sums, including 10%, 20%, 25% and 50% shortcuts. Explainer Percentage Increase vs Percentage Difference Understand when to use percentage change and when percentage difference gives a fairer comparison. UK VAT How to Add or Remove VAT from a Price See the correct formulas for adding VAT to a net price and removing VAT from a gross price. Shopping How to Work Out a Discount in Your Head Use simple mental maths to estimate sale prices, savings and stacked discounts. Shopping guide How to Compare Unit Prices When Shopping Learn how to compare like-for-like prices across pack sizes, weights and volumes.

Everyday maths glossary

Quick definitions for the terms that appear across percentage, VAT, discount, unit price and ratio calculations.

GlossaryPercentageA number expressed as a share of 100. GlossaryPercentage pointThe direct difference between two percentages, not a relative percentage change. GlossaryVATValue Added Tax, added to many goods and services in the UK. GlossaryGross priceThe total price including VAT or other added amounts. GlossaryNet priceThe price before VAT is added or after VAT has been removed. GlossaryDiscountA reduction from the original price, often shown as a percentage. GlossaryUnit priceThe price per item, kilogram, litre, gram or other unit. GlossaryRatioA comparison between two or more quantities. GlossaryProportionA share of a whole, often linked to ratios and percentages. GlossaryRoundingChanging a number to a simpler value, such as two decimal places for money.

Make everyday sums quicker

Start with the percentage calculator for the broadest use case, or jump straight into VAT, discounts, unit prices or ratios when you know the exact sum you need.

Use percentage calculator Add or remove VAT