Calculators
Quick calculators for everyday percentage, tax and price questions.
Calculation Tools
Each calculator below focuses on one everyday task, so you get a clear answer without extra steps.
Percentage Calculator
Calculate a percentage of a value, work out percentage changes, and increase or decrease values by a percentage.
VAT Calculator
Add VAT to a net amount or extract the net amount and included VAT from a gross amount.
Unit Price Calculator
Compare package sizes, quantities and prices on the same basis to see which offer is really cheaper.
Choosing the right calculator
Use Percentage Calculator for questions about a share of a total or a change between two values. Choose VAT Calculator when the distinction between a net amount, tax and a gross total matters. For shopping decisions, Unit Price Calculator puts differently sized packages on a comparable basis.
Start with the question you need answered, rather than entering the same numbers into several tools. A lower package price and a lower unit price describe different things; likewise, a percentage change needs a clear starting value.
Putting everyday calculations in context
These calculators help with tasks such as checking a discount, separating tax from an invoice total or comparing two offers. They make the arithmetic easier to inspect, but the figures and assumptions still come from you.
Keep the units consistent and check which amount is the reference. When calculating VAT, use the rate appropriate to your situation. When comparing products, make sure the quantities describe comparable goods; price alone does not capture differences in quality or suitability.