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All tool categories

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

Categories

Personal Finance Calculators

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

Seller Fee Calculators

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

Health & Nutrition Calculators

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

Student Calculators & Tools

Free student tools for quick, accurate calculations.

Time Tools & Calculators

Free time tools for planning and date math.

Tools for Developers

Free developer utilities for common tasks.

Tools for Everyone

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

Security Tools

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

Network Tools

Free network tools for quick checks and diagnostics.

Personal Finance Calculators

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

Seller Fee Calculators

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

Health & Nutrition Calculators

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

Student Calculators & Tools

Free student tools for quick, accurate calculations.

Time Tools & Calculators

Free time tools for planning and date math.

Tools for Developers

Free developer utilities for common tasks.

Tools for Everyone

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

Security Tools

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

Network Tools

Free network tools for quick checks and diagnostics.