About Aculator

Aculator is a collection of 41 free online calculators across 6 categories, Finance, Health, Date & Time, Math & Everyday, Auto & Engineering, Security. We built it because everyday math deserves the same care as the best software: clean design, honest results and no clutter between you and the answer.

Accuracy you can check

Every calculator is built on published, widely accepted formulas, standard amortization for loans, Mifflin-St Jeor for calorie needs, the haversine formula for distances, NEC conductor data for voltage drop, and so on. Each page shows the exact formula it uses and a worked example, so you can follow the math yourself.

Behind the scenes, the math for each calculator is tested automatically against known answers before every release. We avoid rounding until the very last step, so results don't drift. If you ever spot a result that looks wrong, please tell us, we treat corrections as our highest priority.

Private by design

Everything you type into a calculator stays on your device. Calculations run in your browser; your numbers are never sent to our servers, logged or stored. Preferences such as dark mode or units are saved only in your own browser.

Free, supported by ads

The site is free for everyone and supported by advertising from Google AdSense. Ads are clearly labeled, never placed inside or above a calculator, and never interrupt you while you work. You can read exactly how advertising and cookies work in our Privacy Policy.

Not professional advice

Our tools are for education and planning. They are not a substitute for a doctor, financial advisor, licensed electrician, engineer or attorney. For decisions that matter, please confirm results with a qualified professional. See our Terms of Use for details.

Get in touch

Ideas for a new calculator, feedback on the design, or a question about a result? Email hello@aculator.com or use our contact form.