30+ free tools, zero signup

Every calculator you need, in one free grid

Finance, tax, math, school, fitness and gaming calculators that give you an instant answer with the formula behind it — no account, no paywall.

Instant results

Every calculation runs in your browser — no page reloads or waiting.

Works everywhere

Built mobile-first, so every tool works cleanly on phones, tablets and desktop.

100% free, no account

No registration, no paywalled results. Every tool is free to use.

Choose the right calculator

Use the percentage calculator for general percent questions, the discount calculator for sale prices, and the sales tax calculator when you need to add or remove tax. Each page explains its formula, gives a worked example, and lists important limitations.

Percentage questionsFind X% of Y, percent change, increase or decrease.Shopping discountsCalculate savings, sale price and optional tax.Price plus taxAdd tax or extract it from an inclusive total.

Built for verification

More than a result box

Each calculator explains its formula, includes a worked example, states important limitations, and links to our testing method. Inputs stay in your browser unless a tool clearly says otherwise.

Transparent calculations: formulas and rounding behavior are visible beside the tool.

Clear caveats: tax, finance, and health estimates explain when professional guidance is appropriate.

Corrections welcomed: readers can report an error with the inputs and expected result for reproduction.

Read the editorial and correction policy

Frequently Asked Questions

Are these calculators accurate?

Yes, the calculators use standard formulas and are tested for typical use cases. They provide estimates and should not replace professional advice.

Do you store my data?

No account is required. Tool inputs are processed in your browser where possible, and we do not sell personal calculator inputs.

Are the tools really free?

Yes. UtilGrid is free to use and may be supported by advertising.

Can I use these tools on mobile?

Yes. Every calculator, generator and converter-style utility is designed to work on modern mobile browsers.