About Toolore

Toolore is a collection of calculators, unit converters and utilities for working with text and data formats. Each one is built to answer a single question quickly — you arrive from a search, get the number, and leave.

There is no account to create, nothing to install, and no limit on how often you use anything.

The maths behind every calculator and converter is written as plain functions, separate from the interface, and covered by automated tests. That separation is what makes it possible to state a formula on the page and be confident the page is actually using it.

Unit conversions use the internationally agreed definitions. Where a factor is exact by definition rather than a rounded measurement, the page says so, because knowing which digits to trust matters.

• Show the working. Every tool states the formula or method it uses. A result you cannot check is a result you should not rely on.
• Name the assumptions. Where an answer depends on a convention that differs between countries — mortgage compounding, BMI thresholds, the size of a gallon — the convention is visible on the page and can be changed.
• Never return a confident wrong answer. When something is mathematically undefined, the tool says so rather than returning zero. A percentage change from zero and the growth rate of a total loss have no value, so none is given.
• Keep your data yours. Everything runs in your browser. Nothing you type is uploaded.
• Stay out of the way. No pop-ups, no interstitials, no advertising above the tool, and nothing that has to be dismissed before you can use the page.

Advertising, with your consent. Ads are labelled, never placed where they could be mistaken for part of a tool, and never above the tool itself. If you decline them the site works exactly the same.

If a result looks wrong, or a page states a formula that does not match what it computes, we want to know — that is a bug, and a reported bug is one that can be fixed. Please get in touch with the tool and the figures you used.