About 247 Calculators

247 Calculators publishes free online calculators with detailed editorial guides. Our calculators are reviewed for accuracy against published formulas and, where applicable, UK government data sources. Content is produced by the 247 Calculators Editorial Team — a group contributing across qualified-coach, primary-teacher and finance backgrounds.

We aim for every calculator to be world-class: accurate, simple to use, and accompanied by a clear explanation of the underlying methodology.