About MeasureMate

What the site is for

Most online calculators give you a number and nothing else. That is fine until the number looks wrong, or you need to explain it to someone else. Every tool here sits on a page that writes out the equation it uses, defines each input, walks through one realistic example by hand and lists the situations where the result should not be trusted.

There are 84 tools across 7 topics: unit converters, daily life, health & fitness, time & dates, finance, education and technology.

How we check the math

Each calculator's arithmetic lives in a small, separate function, and each of those functions has its own automated test file. The tests check three kinds of thing:

• Reference values taken from the definition, not from the code: 100 °C is 212 °F, a mile is exactly 1,609.344 m, a $100,000 30-year loan at 6% costs $599.55 a month, and SHA-256 of “abc” starts with ba7816bf.
• The worked example printed on the page, so the explanation and the tool cannot drift apart.
• Edge cases: zero and negative inputs, interest rates of 0%, leap years, daylight-saving changes, bracket boundaries and unit labels that must match their factors.

The tests run before every release. Writing them in October 2026 turned up real defects that have now been fixed, including three unit converters that returned no result at all, a data converter that labeled binary units as decimal ones, a refinance calculator that counted closing costs twice and a compound-interest tool that ignored the compounding frequency for monthly deposits.

Unit conversions use exact legal definitions (NIST and the BIPM SI Brochure). Health calculators name the published equation they use, such as Mifflin-St Jeor or the US Navy circumference method. Finance tools use the standard amortization and compound-interest formulas shown on each page.

How the pages are written

Each page is written for its own tool rather than filled in from a template: why someone would use it, the formula with every symbol defined, a worked example with realistic numbers, the questions people actually ask about it, and the cases where the result is misleading. An automated check stops two calculator pages from sharing a sentence or an FAQ question.

Figures that come from outside the formula, such as health thresholds, tax brackets, VAT rates or the yield of a bag of concrete, are taken from the body that publishes them (government agencies, standards bodies, the original research paper or the manufacturer), and those sources are listed at the bottom of the page. Every worked example is recomputed by the test suite, so a typo in the explanation fails the build. Each page shows the date it last changed.

Drafts are written with the help of AI tools, then checked against the cited sources and the automated tests, with tools, before publication.

Rates that change

Some numbers go out of date. US federal tax brackets are updated for each tax year (the tax calculator uses tax year 2026), and the VAT calculator lists standard rates last checked in October 2026. The currency converter fetches the European Central Bank's daily reference rates when you open it and shows their date. The cryptocurrency converter does not store prices at all; you enter the current price yourself.

What the results are not

The results are estimates for general information. They are not medical, financial, tax or legal advice. Health calculators are screening tools for adults, and money calculators leave out fees, taxes and circumstances they cannot know about. Each page says what its tool leaves out.

Privacy in short

The calculators run in your browser, and the numbers you type into them are not sent to our servers. The exceptions are stated on the pages concerned: the currency converter requests exchange rates from the Frankfurter API. The site uses Google Analytics and Google AdSense, which use cookies subject to the consent choice you make in the Google consent message (shown to visitors in the EEA, the UK and Switzerland). Details are in the privacy policy.

Who runs it and how it is funded

MeasureMate is published by Jonkai Ventures OÜ, a private limited company registered in Estonia (registry code 17322110). It is part of the Jonkai Network, the company's group of independent reference sites and apps. The site is free to use and is supported by advertising. Advertisers have no say in what the calculators compute or what the pages say.

Jonkai Ventures OÜ
Tartu mnt 67/1-13b, 10115 Tallinn, Estonia (EU)
info@measuremate.cc

Found a mistake?

If a result looks wrong, email info@measuremate.cc with the calculator's name and the numbers you entered (some tools, such as the BMI calculator and the length converter, also keep them in the page address). Confirmed errors get a fix and a new test so they stay fixed.