toolmallow.

Make it local

Choose defaults for supported calculators. You can mix a region, units and currency.

Changing units converts supported measurements. Changing currency relabels amounts; it does not exchange money. Tax rules, tariffs and broker rates remain your inputs.

Only these preferences are saved in this browser. Calculator inputs are not saved.
← Back to the toolkitUPDATED 11 NOVEMBER 2026

A toolkit more people can use.

Our approach

ToolMallow uses labeled controls, keyboard focus indicators, semantic headings, a skip link, and responsive layouts. Color is not the only way a tool’s state is conveyed. Motion is reduced when the browser requests it.

Browser and device support

Modern browsers are recommended. Image workers require OffscreenCanvas support. Very large documents may exceed available device memory. A technical limitation should produce a readable error rather than a misleading success message.

Tell us what gets in the way

If a control, layout, or explanation is difficult to use, send a description through Contact. Include the tool name, browser, and any assistive technology you choose to mention. We do not claim formal WCAG certification.