About DailyCalc
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DailyCalc is a collection of 110 calculators and 234 unit converters covering the questions that come up in ordinary life: what a loan really costs, how many calories to eat, what a plot of land measures in square feet, how long a download will take.
Who publishes it
DailyCalc is published by FutureTek Apps, an independent software developer, which also publishes the DailyCalc Android app. The site is not a content farm and is not syndicated from anywhere: every calculator, every converter and every word of explanation on this site was written and built for it. Editorial decisions, formula choices and corrections all rest with the same person who writes the code, and correspondence reaches them directly at contact@thedailycalc.com.
Everything runs in your browser
There is no back end. Every formula executes as JavaScript on your own device, which means the numbers you enter — income, weight, medical dates, loan balances — are never transmitted to a server, never logged, and never stored. Closing the tab discards them.
How the maths is verified
Each calculator is built on a shared library of pure functions, and that library is covered by an automated test suite that checks known results, boundary conditions and invalid input. The finance, health, date and everyday engines are shared with the DailyCalc Android app, so those figures match the ones calculated there. Physics, statistics and the newer converters are web-only, and are checked against published tables and worked examples instead.
Why the formulas are named
Most calculators of this kind show a number and leave you to trust it. Every page here that implements a published formula names it, states what it assumes and what it leaves out, and cites where it comes from — over ninety citations across the site, and every conversion factor is traced to the body that defined it, from the 1959 yard-and-pound agreement to IEC 80000-13. The methodology page explains how formulas are chosen, how they are tested and what happens when one turns out to be wrong.
How it is paid for
The site is free, has no accounts and no paid tier, and is intended to be supported by advertising. That is the whole business model, and it is worth stating plainly because it shapes what the site will and will not do: it does not sell anything, does not collect personal details to sell, and does not recommend products in exchange for payment. What you type into a calculator never leaves your device, advertising or not — see the privacy policy.
What these tools are not
They are estimates, and estimates rest on assumptions. A retirement projection cannot know what markets will do; a BMI figure cannot see your body composition; a due date is a probability, not an appointment. Nothing here is financial, medical, legal or engineering advice, and decisions that matter deserve a qualified professional as well as a calculator.
Corrections
If a result looks wrong, it may well be. Formula corrections are welcome and get fixed quickly — accuracy is the entire value of a site like this.