Clear unit conversions for everyday decisions.

Why ConverterKit exists

Unit conversion is a solved problem. The reason ConverterKit exists is the gap between “solved” and “solved at the kitchen counter at 8pm with flour on the screen”. Most converter sites optimize for a single trophy keyword and bury the result under three banner ads and a quiz. ConverterKit inverts that: small, focused tools, answers above the fold, the formula and density assumption visible next to the number.

The converter cluster

The site covers length and distance (metric to imperial and back), mass and weight, volume and capacity, temperature (with the absolute-zero clamp documented), area, speed, pressure, energy, power, and time. A currency converter quotes rates from a public mid-market FX feed with the last-update timestamp shown alongside the result. The cooking-unit converter handles cups to grams and milliliters to ounces with an explicit ingredient dropdown — because the density of all-purpose flour, granulated sugar, and brown sugar differs enough that a single “1 cup = X grams” row would be wrong half the time. The shoe-size converter spans US, UK, EU, and Japanese systems for men’s, women’s, and children’s footwear, with brand-specific notes where the published size chart differs from the system-wide standard.

Methodology

Standard unit pairs use fixed conversion factors traceable to NIST Special Publication 811 (the US guide to SI use) and to the BIPM SI Brochure for international units. Cooking conversions reference USDA FoodData Central for ingredient densities; where USDA data is unavailable or contested, the source is named on the tool page itself. Currency rates come from a public mid-market feed and are intended for general reference, not for executing transactions — the spread you would actually pay on a card or wire depends on the issuer and the moment.

Editorial cadence

ConverterKit is published by the inovisum team, a small tools studio. Cooking ingredient density tables and shoe-size chart references are reviewed each quarter; standard unit factors change rarely (most recently when the kilogram’s definition was redefined in 2019 against the Planck constant, with no practical impact at consumer scale). Currency feed status is checked on each release pass. If a converter returns a value that disagrees with a published reference, write in with the citation and the page will be re-checked against it.