About toolhearth

toolhearth.com is a free collection of 100+ calculators, converters, and utilities for everyday tasks—fitness, finance, work, and play. Everything runs in your browser. No accounts, no tracking, no upsell.

Our Mission

We believe useful tools should be free, private, and fast. No ads that break the layout. No dark patterns. Just math that works.

What We Offer

• Calculators: BMI, BMR, calorie, mortgage, retirement, tip, loan, and more
• Converters: Temperature, length, weight, currency, timezone, and more
• Developer tools: ASCII table, regex tester, UUID generator, JWT decoder, and more
• Generators: QR codes, passwords, random numbers, names, quotes, and more
• Timers & clocks: Pomodoro, countdown, stopwatch, metronome, world clock

How We Stay Free

toolhearth is supported by unobtrusive ads and an email newsletter. We never sell your data.

Built With

HTML + CSS + vanilla JavaScript. No frameworks, no bloat. ~50KB total site size.

Get in Touch

Questions? Ideas for tools? Contact us.