Online Tools That Just Work
Fast, accurate, and beautifully simple. Calculators, converters, size guides and more — all in one place.
All Tools
Each one loads instantly and works on any device. Pick one below to get started.
Unit Converter
Convert length, weight, volume, temperature, speed and area instantly.
Percentage Calculator
Find percentages, calculate increases, decreases and differences.
BMI Calculator
Calculate your Body Mass Index with metric or imperial measurements.
Mortgage Calculator
Calculate monthly payments, total interest and compare loan terms.
Age Calculator
Find your exact age in years, months, days, hours and more.
Date Calculator
Find days between dates, add or subtract days from any date.
Cooking Measurements
Convert US cups, tablespoons and fluid ounces to UK and metric. Oven temps and ingredient weights.
Colour Wheel
Find complementary, analogous, triadic and split colour combinations.
Colour Code Converter
Convert between HEX, RGB, HSL and CMYK colour formats.
Word Counter
Count words, characters, sentences and paragraphs. Estimate reading time.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase and more.
Password Generator
Create strong, secure passwords with custom length and character options.
Timer & Stopwatch
Countdown timer with presets and a precise stopwatch with lap tracking.
Men's Clothing Sizes
Convert men's shirt, trouser and jacket sizes between US, UK and EU.
Women's Clothing Sizes
Convert women's dress, top and trouser sizes between US, UK and EU.
Children's Clothing Sizes
Convert kids' clothing sizes between US, UK and EU. Ages 2-14.
Men's Shoe Sizes
Convert men's shoe sizes between US, UK and EU with foot measurements.
Women's Shoe Sizes
Convert women's shoe sizes between US, UK and EU with foot measurements.
Children's Shoe Sizes
Convert kids' shoe sizes between US, UK and EU. Babies to age 12+.
Typing Test (US)
Measure your typing speed in WPM with American English passages.
Typing Test (UK)
Measure your typing speed in WPM with British English passages.
Text to Binary
Convert text to binary, hexadecimal, decimal and octal — or back again.
Random Number Generator
Generate random numbers, roll dice, flip coins and pick lottery numbers.
Advertisement
Why ToolBox?
Instant
No loading screens. Results appear as you type.
Accurate
Precise calculations you can rely on every time.
Free Forever
No hidden fees, no premium tiers, no sign-up.
Any Device
Works perfectly on phone, tablet, or desktop.
Frequently Asked Questions
Are these tools really free?
Yes, completely free with no hidden costs. Every tool works without creating an account or providing any personal information.
How accurate are the calculators?
All calculators use standard mathematical formulas and are tested for precision. The unit converter handles conversions to at least 6 decimal places.
Do you store my data?
No. Everything runs in your browser. Your text, calculations and passwords never leave your device — nothing is sent to any server.
Can I use these tools on my phone?
Absolutely. Every tool is fully responsive and works on smartphones, tablets and desktop computers.
Will you add more tools?
Yes! We regularly add new tools based on what people need most. Bookmark this page and check back for updates.