About
We make small, precise tools that do one job well — and explain exactly how they work.
What we do
MisterToolkit is a collection of 16 free online tools for money, maths, health, text, images and study. Each tool is paired with guides that explain the method behind the result, because a number you understand is a number you can trust.
Principles
- Transparent maths. Calculators state their formula and assumptions on the page.
- Private by design. Tools run in your browser. We don't upload your text, images or figures.
- No friction. No accounts, no paywalls, no pop-ups standing between you and the answer.
- Accurate and maintained. We test tools against known values and update guides when standards change.
Accuracy
Our results are estimates intended for information and planning. For financial, medical or legal decisions, please confirm with a qualified professional. Read our disclaimer for details.
Get in touch
Found a bug, want a new tool, or spotted something we could explain better? Contact us — we read everything.
Start with the full tool index or browse the guide library.