About us
Making everyday maths clear, quick and free.
Calculations.one is a free library of online calculators — for anyone who needs a reliable number and wants to understand where it came from.
Our mission
A calculator you can understand is a calculator you can trust
Most people don't need a spreadsheet — they need one honest answer. How much will this loan really cost? Is my BMI in a healthy range? What's 18% GST on this invoice? How many bricks does this wall need?
We built Calculations.one to answer those questions in seconds, without accounts, paywalls or clutter. And because a number on its own isn't enough, we show the formula, explain the inputs and state the assumptions, so you can check the logic for yourself.
Today the site covers finance and investing, tax, loans, health and fitness, education, business and marketing, creators, construction, engineering, science, conversions and everyday maths — and it grows every month based on what people ask us for.
- Platform
- Calculations.one
- Built by
- GetBizSetup
- Part of
- An Evavel Group Company
- Country
- India
- Launched
- 2026
- Contact
- care@calculations.one
- Cost
- Free · ad-supported
What we believe
Six principles behind every calculator
These shape what we build, what we leave out and how we fix mistakes.
Correct before clever
Standard, published formulas tested against hand-worked examples and edge cases before a tool goes live.
Show the working
Formulas, units and assumptions are written on the page — no black-box numbers.
Fewest inputs possible
Sensible defaults and plain labels, so you get an answer without reading a manual.
Your numbers stay yours
Most calculators run entirely in your browser. No accounts, no profiles of what you calculate.
Free, on any device
Every tool works on phones, tablets and desktops, with no download and no usage limit.
Clear about limits
Estimates are labelled as estimates, and we point you to a professional when the stakes are high.
Our process
How a calculator gets built
Every new tool goes through the same five steps.
Who we build for
Made for everyday decisions
Learn by checking
Work problems by hand, then check with the calculator and its formula.
GPA / CGPA →Math calculators →Science calculators →Plan money & health
Loans, savings, budgets and health basics in plain language.
EMI calculator →SIP calculator →BMI calculator →Price with confidence
Margins, break-even, GST, payroll and ROI without a finance team.
Profit margin →Break-even →GST calculator →Estimate materials
Concrete, bricks, paint, tiles and more — before you buy.
Concrete →Bricks →Paint →Our journey
Where we've been, and where we're going
Platform launch
Calculations.one goes live with core finance, health, education and everyday calculators.
35 category hubs
The library grows to 280+ tools with hubs for investing, tax, creators, construction, engineering and science.
Learn-first redesign
A new home page with quick calculators, a formula library, guides by goal and a glossary.
Formula notes on every tool Planned
Worked examples, assumptions and sources added consistently across all calculator pages.
Save & compare scenarios Planned
Compare two loan or investment scenarios side by side — still without an account.
FAQ
About us — common questions
Who owns Calculations.one?
Calculations.one is an independent website based in India, designed and maintained by GetBizSetup, a part of An Evavel Group Company. Ownership details are in the footer of every page.
How do you make money if the calculators are free?
Through on-page advertising and sales of our optional HTML and WordPress calculator website templates. Neither affects the results a calculator gives you.
How do you decide which calculators to build?
From user requests, the questions people search for most, and gaps we notice in existing tools. If you want a calculator we don't have, tell us.
Can I trust the results?
We use standard formulas, test against worked examples and state our assumptions. Results are still estimates — please read our Disclaimer before making important decisions.
Have an idea for a calculator?
Tell us what you need to calculate. Many of our tools started as a single email from a user.