About CalcLab

CalcLab is a free collection of calculators for the math that comes up in everyday life — percentages, dates, ages and more. There is nothing to install and no account to create: open a page, type your numbers, and the answer is right there.

What we build by

• Instant results — the answer updates as you type. No "calculate" button to hunt for.
• Everything stays in your browser — nothing you type is sent to a server. Every calculation runs locally on your device, with no accounts and no stored data.
• Formulas and explanations included — we never show a bare number. Every calculator explains the formula it uses and walks through examples, so you can check the math yourself.
• Mobile first — big inputs and big results, designed to be comfortable on a phone before anything else.

A quick note

We keep every calculator accurate against widely used, standard formulas. Even so, the results are for reference. For anything where money or the law is on the line — taxes, payroll, loans — please confirm the final numbers with the relevant institution or a professional.

Contact

Found a bug, or have an idea for a new calculator? We would love to hear it.

Email: calculab.admin@gmail.com