About CalculateEveryday
243 calculators across 13 categories. Free and fast, usable without an account, and funded by sponsor slots rather than an ad network. Type a number, get an answer, understand where it came from.
Why it exists
Most calculator sites are a thin wrapper around one formula, buried under four ad units and a cookie wall, with no explanation of what the number means or when it stops being true. That is a deliberate business model, and it is a bad one for the person doing the maths.
So this site inverts it: the calculator is the page. Every one ships with the formula written out, a worked example with a realistic number, the edge cases where the result misleads, and charts where they actually help. Nothing is gated and nothing tracks you across the web.
How it makes money
16 sponsor slots at $10/day with a volume discount for longer bookings, and a $5/month option to embed a calculator without our watermark. That is the entire business model.
Anyone can advertise from the sponsor page by paying in US dollars for as many days as they choose — the more days, the cheaper each one gets (see Rules for the exact math). Whoever pays first for an open slot gets it — no bidding, no rate card, no sales call. A booking simply runs its paid duration and ends on its date; a booking is not refunded, because nobody is ever displaced before their days are up.
What we deliberately do not do: no Google AdSense, no programmatic exchange, no retargeting pixels, no sponsored calculators, no paid reviews, no dofollow backlinks, and no selling your data. Sponsors buy placement and nothing else — they cannot touch a formula, a result, or a ranking. That boundary is written down in our Advertising Policy and Editorial Standards.
How calculators get built
- Formulas are checked against a primary source — a regulator, a standard, or a textbook derivation — not against another calculator site.
- Money is computed in integer minor units, so displayed figures don't drift from floating-point rounding.
- Every page lists the assumptions and the cases where the answer stops being useful.
- Corrections are made promptly, and we don't quietly edit a published figure.
Results are general information, never financial, medical, legal, or tax advice. See the Disclaimer.
Take it with you
Every calculator is embeddable in one line of HTML — grab the snippet from any calculator page and drop it on your own site. The free embed carries a small CalculateEveryday bar and a credit link back to the calculator; if you would rather it didn't, $5/month removes the watermark for one calculator on one site. Results can be shared as a short link that renders a preview card in chat apps.
Coming next
More calculators. Send the calculator you wish existed — that is where most of these came from.
Who runs it
Suman Kumar, a software engineer, operating as CWK Solution in India. One person writes the calculators, reviews the maths, and answers the email.
calculateeveryday.com · hello@calculateeveryday.com · full contact details