Why MiniCalc
exists.

Every calculator site felt dated, spammy, or both. So we built one that isn't.

Built and maintained by Adib Khan. Product and methodology page last reviewed: September 3, 2026.

The idea

A calculator should also teach. Show the formula. Work the example. Explain why the answer is what it is. That way you can spot when a result looks off, and you can use the calculator again without it.

The math, in plain sight

Every engine is plain JavaScript with documented formulas and canonical test vectors. Compound interest matches the textbook $1,000 at 5% monthly for 10 years ≈ $1,647.01. Financial calculators are estimates, not tax, legal, investment, or other professional advice. Income-tax tools use 2026 IRS brackets and state-jurisdiction assumptions documented on their individual pages; confirm consequential decisions with a qualified professional.

Data-backed pages should show the formula or calculation method, the source links, the data vintage, and the important exclusions. If one does not, that is a documentation bug — tell us.

What we don't do

  • No ads. Nothing pretending to be a button.
  • No accounts. No signups, no email gate, no "log in to see your result."
  • No cookies. Theme preferences live in your browser's localStorage — your device, your bytes.
  • No cross-site tracking. No fingerprinting, no ad networks, no data brokers, no profile that follows you around the web.
  • No selling your data. There isn't any to sell — we never collect anything tied to you.

We measure anonymous visit counts via Cloudflare Web Analytics — cookieless, aggregate-only (pageviews, referrers, country), with no personal data and nothing that follows you across sites. We also record a small allowlisted set of aggregate product outcomes (such as an embed-code copy) in application logs. Those events contain no inputs, results, query strings, referrers, or user IDs. Fonts and the chart library are served from our own domain, so beyond that one beacon your browser makes zero third-party requests. Open DevTools → Network and count them yourself.

When numbers disagree

If MiniCalc gives a different answer than another calculator, it's almost always one of these:

  • Compounding period — daily vs monthly vs continuous.
  • Contribution timing — beginning vs end of period.
  • Rounding — bankers' vs half-up, and at which step.
  • Inclusions — mortgages that include or exclude PMI, taxes, insurance, HOA.

Each calculator's page states the assumptions it makes. If it doesn't, that's a documentation bug.

Change history

Methodology and product documentation are reviewed when calculation assumptions or collection practices change. The versioned project history records implementation changes; calculator pages should identify their own source vintage and assumptions. We do not claim named reviewer credentials where they have not been independently established.

Get in touch

Found a bug, want a calculator that doesn't exist yet, or just want to say hi? Email hello@… — or use the anonymous "Was this helpful?" buttons on any page.