A home for honest, useful calculators.
Calculator Services is an independent publisher of free online calculators, unit converters and utilities. We build tools that help learners, professionals and curious minds get clear answers — without ad clutter, sign-ups or dark patterns.
Finance, health, math, science, everyday life — organised into 17 searchable categories.
Accountants, ecommerce operators, students, home buyers and engineers in 120+ countries.
No sign-ups, no cross-site tracking, anonymised analytics only. See our Privacy Policy.
Who we are
Calculator Services is an independent web publisher founded in 2026. We build and maintain one of the largest free directories of online calculators and unit converters on the web. We are a small, self-funded team — the kind of operation that cares more about getting a formula right than chasing the trend of the week.
Every calculator is implemented from first principles using the underlying mathematical, physical, financial or physiological formula. We never copy text or code from other calculator sites. Each page explains the formula, shows a worked example and answers common questions so you can understand the result — not just see a number.
We’re supported by a small number of sponsored placements (clearly labelled) and optional banner ads. We do not sell personal data, and we never will. The source of revenue has no bearing on which formulas we publish.
Updated continuously; sitemap refreshed on every deploy.
Registered online publisher
Correspondence via email
What you can contact us about
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