All tool categories

Browse categories to find calculators and utilities. Each tool is mobile-first, fast, and includes formulas and practical interpretation.

Personal Finance Calculators

Free personal finance calculators designed for speed, clarity, and mobile-first use.

Free calculators for marketplace sellers to estimate fees, profit, and margins.

Free health calculators with easy-to-read outputs and explanations.

Free student tools for quick, accurate calculations.

Free time tools for planning and date math.

Free developer utilities for common tasks.

Everyday utilities anyone can use — fast, private, and mobile-first.

Fast material estimators for paint, flooring, and concrete — with clear formulas and practical outputs.

Security and crypto utilities for hashes, tokens, and passwords (client-side).

Free network tools for quick checks and diagnostics.