About SuperGlobalCalculator

What this site is

SuperGlobalCalculator (SGC) is a free reference site for calculators and unit conversions across every life category we could find a use for, and a few we had to research from scratch.

The catalog spans Finance, Health, Construction, Cooking, Math, and Physics on the well-trodden side, but also Beadwork, Beekeeping, Equestrian, Glass Blowing, Origami, and Rock Climbing on the niche side.
The niches matter as much as the popular categories.
A kite flyer picking a line strength, or a homesteader stocking a stall, deserves the same quality of calculator as someone running a mortgage scenario.

Who builds and maintains it

SGC is built and maintained by working software developers with two decades of experience writing finance, database, and reporting software.
Every calculator on the site is a small piece of code we wrote: take inputs, run real math, produce a useful result.

Everything is written and maintained in-house.
Each calculator is hand-built.
Where we lean on a formula, we cite where it comes from in the body of the page.

How the calculators are built

The build process for a typical page looks like this:

Sourcing. We look up the canonical formula in primary sources rather than Wikipedia summaries.
Most physics, chemistry, and engineering formulas have unambiguous textbook derivations.
Health and fitness formulas (BMI, BMR, VO₂ max, ideal body weight) come from the original published studies, with the original authors named on the page.
Government and standards-body data is preferred when available: NHTSA for skid-speed reconstruction, USGS for dissolved oxygen, ICAO for the standard atmosphere, UIAA for climbing fall forces, NIST for physical constants.
Implementation. The math runs entirely in your browser.
There is no server round-trip and no inputs are sent anywhere.
That is partly a privacy choice and partly why the site is fast.
Verification. We run worked examples through each new calculator and compare against published reference values.
The Stefan-Boltzmann calculator should reproduce the Sun’s luminosity (about 3.85 × 10²⁶ W) when fed the Sun’s surface temperature and radius.
The Haversine calculator should match the New York to London great-circle distance (about 5,570 km).
If a calculator does not reproduce its textbook example, it is broken and gets fixed before it ships.
Honest result panels. A result is more useful than a number.
Each calculator’s result tells you the breakdown, the assumptions used, and the cases where the answer stops being valid.
When the Carnot efficiency calculator says real engines hit 30 to 60 percent of the theoretical limit, that is the difference between a textbook number and a useful estimate.

What this site is not

SGC is for estimation, education, and quick reference. It is explicitly not:

A substitute for professional advice on medical, legal, financial, or engineering decisions
A real-time data feed (currency rates, stock prices, fuel prices, and tax rates are user inputs, not pulled from a market feed)
A guarantee that any answer is correct for your specific case — formulas drift, regulations change, and edge cases exist

If you find a wrong number or a broken calculator, the fastest way to reach us is the Contact page.
Bug reports usually get fixed within a day or two.
Suggestions for new calculators get queued and added in batches.

Privacy

Every calculation runs locally in your browser.
Inputs never leave your device.
The site does not require an account and does not track you across sessions, beyond standard Cloudflare edge logs and Google Analytics for measuring traffic.

Full details on the Privacy Policy page.