Free online calculators for percentages, age, loans, BMI & calories, concrete, Airbnb ROI and AI token costs. 100% in your browser — fast, private, no sign-up.

Hey Product Hunt! 👋 I built Apexa Pro because I kept bouncing between a dozen different calculator sites, each cluttered with ads, forced sign-ups, or missing exactly the one tool I needed. It's now 128 free calculators — no sign-up, no downloads — spanning finance (mortgages, loans, compound interest), health, cooking, automotive, sports, and even a whole section of animated learning tools for kids (base-ten blocks, an interactive number line, a fraction pizza — built to make math actually fun to look at). A few I'm personally proud of if you want a fun first stop: → Coffee composition calculator (see coffee/water/milk ratios poured in real time) → Live salary counter (watch your earnings tick up in real time) → Interplanetary trip calculator (find out how long it'd take to reach Mars at the speed of light... or walking) Everything's bilingual (English/Spanish) and runs 100% in your browser. Would love to know: what's a calculator you've always wished existed but could never find? I'm actively building and this is genuinely useful feedback for what to build next. 🙏

How does the Airbnb ROI calculator handle things like occupancy fluctuations or seasonal pricing, or is it just a flat-rate estimate?

Love that everything runs entirely in the browser with no sign-up. The tabbed layout keeps all those random calculators I actually use (loan, BMI, concrete) one click away without any clutter.

Love how everything runs purely in the browser with zero sign-up friction. Picking a random calc like the Airbnb ROI one and seeing it load instantly with no clutter is a real treat.

How does the Airbnb ROI calculator handle things like occupancy fluctuations or seasonal pricing, or is it just a flat-rate estimate?

Love that everything runs entirely in the browser with no sign-up. The tabbed layout keeps all those random calculators I actually use (loan, BMI, concrete) one click away without any clutter.

Love how everything runs purely in the browser with zero sign-up friction. Picking a random calc like the Airbnb ROI one and seeing it load instantly with no clutter is a real treat.

Apexa Pro

Free calculators for finance, health, cooking, kids & more

Free calculators for finance, health, cooking, kids & more