About Quanta

Quanta is independently owned and privately held. We are not funded by, affiliated with, or writing on behalf of any of the institutions whose published figures we cite.

We can be reached at hello@quantacalculator.com. Corrections are welcome and read by a person — see “Corrections” below.

Each calculator is a working tool, not an article with a number in it. The arithmetic runs in your browser, the formula is printed on the page with its symbols explained, and a worked example shows the same calculation done by hand so you can check the tool against it.

We publish the formula because a result you cannot verify is not much use. If you disagree with an answer, the page should give you enough to find out which of us is wrong.

Figures come from the body that defines them, not from other calculator sites. Tax figures come from the IRS. Sports statistics come from the league's own rulebook or official stat glossary — MLB, the NBA, the NFL, the USGA and R&A, the ICC. Standards come from the standards body: IETF RFCs for network addressing, SMPTE for timecode, CIPA for camera exposure, NIST for password entropy, USDA and FDA for food safety.

Every citation URL is fetched and checked to contain the figure attributed to it before a page ships. A citation that merely looks authoritative is worse than none, because it transfers credibility the source never actually lent.

Where a formula has more than one accepted variant, the page names which one it implements. NFL and NCAA passer rating are different formulas. Baseball batting average divides by at-bats; cricket batting average divides by dismissals. Pages that could be confused with each other say so and link to each other.

The rule we hold to most strictly is that we do not invent a number we cannot verify. When a required constant is proprietary, paywalled or simply unpublished, we narrow the calculator's scope and say so on the page — or we do not publish it at all.

Some worked examples: we do not offer an ESPN Total QBR calculator, because ESPN does not publish the coefficients and an approximation carrying that name would mislead. Our exposure-value calculator returns no lux reading, because ISO 2720 lets each manufacturer choose the calibration constant that conversion depends on. Our TV viewing-distance page does not quote the widely repeated “SMPTE 30 degrees” figure, because the SMPTE documents behind it are paywalled and we could not verify it. Our net run rate calculator does not implement Duckworth-Lewis-Stern adjustments, because those tables are proprietary.

Each of those is a page that would have been easy to publish and slightly wrong. We would rather answer a narrower question accurately.

Some questions have no exact published answer. Where we ship an estimate — a heuristic, a linear approximation, a model with assumptions baked in — the page says so plainly and states what the estimate does and does not capture.

This matters most on pages where a false precision could affect a decision. Financial, medical and safety calculators carry the tax year or guideline revision they implement, the date the figures were last reviewed, and an instruction to consult a professional where the stakes warrant it. A calculator is a starting point for those questions, never the last word.

If a figure is wrong, out of date, or a source no longer supports what we attributed to it, tell us at hello@quantacalculator.com. Include the page and, if you can, the source you think is correct.

Published figures change — tax rates are revised, governing bodies amend their formulas mid-season, standards are superseded. We would rather hear about it from you than leave it wrong.

All 590 calculators are free to use, with no account required. A free account adds saved calculations and nothing is placed behind payment today.

We intend to fund the site with advertising. When advertising is enabled, it will be disclosed in our Cookie Notice and Privacy Policy before it runs, and it will not influence which figures a calculator reports.