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40+ free tools for money, health, math, and everyday life — running entirely in your browser.
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Built a little differently
Your numbers stay yours
Every calculation runs locally in your browser. Nothing you type — not a salary, a weight, a due date — is ever sent to a server.
Works in your currency
Pick from 152 currencies in the header and every money tool switches instantly — symbols, labels, results.
Answers, then understanding
Each tool ships with the formula, a worked example, and honest FAQs — so you know why the number is what it is.
Dark mode, done properly
A real theme, not an afterthought — every calculator, chart, and table readable at 2 a.m.
Questions,
answered
The things people ask before trusting a calculator site.
Yes — every tool is completely free with no signup, no paywall, and no usage limits. The site is supported by non-intrusive advertising.
Each calculator uses industry-standard formulas — the same amortization math lenders use, the Mifflin-St Jeor equation for calories, WHO ranges for BMI — and every tool page documents its formula with a worked example.
No. All calculations run entirely in your browser — nothing you type into any calculator is transmitted to or stored on our servers.
Yes — every tool is fully responsive and works on phones, tablets, and desktops, in light or dark mode.
Yes — use the currency selector in the header to pick from 150+ currencies. All money-based calculators update their symbols instantly.
From the blog
All articles →
Emergency Fund: How Much Is Enough? The 3/6/9-Month Math
A $1,000 cushion feels safe until the transmission dies. Here is the math behind 3, 6 and 9 months of expenses — and a one-year plan to build yours.
BMR: The Energy Your Body Burns Doing Absolutely Nothing
Roughly 60-70% of your daily calories are spent staying alive. What BMR is, which formula to trust, why it drops when you diet, and how to protect it.
How Random Is Random? Inside the Numbers Computers Pretend to Guess
Your computer can't actually be random — it fakes it beautifully. Pseudorandom generators, seeds, why lava lamps guard the internet, and why humans are terrible at it.
The Golden Ratio: Real Mathematics, Overhyped Mythology
φ = 1.618… is genuinely remarkable — it just didn't design the Parthenon or the Mona Lisa. What's true, what's myth, and where nature really does use it.
That's the tour. Browse all 40+ calculators — or just search for what you need.