About AllFreeCalculator
Built by one person. Trusted for accurate, fast, free calculations.
Why I built this
I'm Nauman Pathan, an SEO expert who spent years watching people struggle with calculator tools that were slow, covered in ads, or simply wrong. Every time someone searched for a mortgage payment, a tax estimate, or a calorie count, they landed on a page that made them scroll through three screens of filler before getting to the actual tool — and then the result was often based on outdated formulas.
I built AllFreeCalculator to fix that. One person, one site, no team of sponsored writers, no VC funding, no agenda beyond making the most useful calculator for every query I could find. Every page is hand-built. Every formula is checked against an official source. Every update is done by me personally.
The site launched because I needed it myself. It keeps growing because apparently a lot of other people needed it too.
Fast by default
Every calculator loads instantly. There is no backend call, no API request, no spinner. Your inputs stay in your browser — they are never sent to a server.
Verified formulas
Tax rates come from IRS publications. Health metrics follow WHO and CDC guidelines. Financial formulas match Bureau of Labor Statistics data. Every formula has a named source, and I update them when official guidance changes.
One real person
This site is not a content farm. It is maintained by a single person — me — which means if something is wrong, I hear about it directly and fix it. There is no support ticket queue.
Meet the founder
Nauman Pathan
SEO Expert · Founder, AllFreeCalculator.com
I have worked in SEO for years, which means I understand exactly how search results fail people. I know when a calculator page ranks #1 because of backlinks, not because it is accurate. AllFreeCalculator exists to be the result that actually deserves to rank — because the tool works, not because the domain has authority.
I review every calculator on this site personally. When tax law changes, I update the rates. When a new BLS report drops, I check the wage figures. When a user emails to say a result looks wrong, I pull up the formula and verify it. That is the only quality control process here — and I think that is enough, because it is mine to own.
How the site works
AllFreeCalculator is a static site. There is no database, no user accounts, no analytics pixel farm, and no third-party math engine. Every calculator is written in plain HTML, CSS, and vanilla JavaScript. Your inputs never leave your browser.
No backend
Runs entirely in your browser
No tracking
No cross-site analytics or ad networks
No paywalls
Every tool is free, forever
No signups
Open and use instantly
Where our formulas come from
Every calculator category uses specific official sources. Here is exactly what we rely on.
| Calculator type | Official source used |
|---|---|
| Federal income tax | IRS Tax Withholding Tables (Publication 15-T, updated annually) |
| State paycheck / tax | State revenue department publications (per state) |
| Health metrics (BMI, BMR, body fat) | WHO Technical Report Series; CDC Clinical Growth Charts |
| Calorie & nutrition | USDA FoodData Central; Dietary Guidelines for Americans |
| Inflation & wage data | U.S. Bureau of Labor Statistics (CPI-U; Occupational Employment) |
| Mortgage & loan math | Standard amortization formula; Federal Reserve Regulation Z |
| Retirement & investment | IRS Publication 590-A/B; SEC compounding guidance |
| Pregnancy & conception | ACOG (American College of Obstetricians and Gynecologists) guidelines |
| Fitness & exercise | American College of Sports Medicine (ACSM) standards |
Sources are reviewed when official publications update. Last reviewed: October 2026.
Questions or corrections?
If a formula looks wrong, a result seems off, or you want to request a calculator that does not exist yet — I want to know. I read every message personally.