Calculators that just click.
A general-purpose calculator hub built on a single idea: every digit gets its own colour, so the answer is legible at a glance — even before you finish reading it.
Pick a category
Calculators grouped by what they actually do, not how they're named.
Math
Percentages, fractions, equations and the building blocks.
Conversion
Temperature, number bases, Roman numerals — and more at unitcrate.com.
Date & time
Age, date differences, countdowns, time zones.
Everyday
Tips, GPAs, fuel cost, split-the-bill — the small stuff.
Science
Density, molarity, Ohm's law, physics quick-checks.
All calculators
- 01Fraction calculator
- 02Scientific calculator
- 03Ratio calculator
- 04Matrix calculator
- 05Age calculator
- 06Date difference
- 07Time zone converter
- 08GPA calculator
- 09Fuel cost calculator
- 10Ohm's law calculator
- 11Density calculator
- 12Password generator
- 13Area calculator
- 14Number base converter
- 15Speed calculator
- 16Roman numeral converter
- 17Temperature converter
- 18Exponent calculator
- 19LCM & GCF calculator
- 20Grade calculator
Manifesto
- 01
Numerals are illegible by default.
Long answers blur into one shape. We give every digit its own colour so you can read it before you read it.
- 02
Colour is not decoration.
It encodes the value. Once you know red is one and blue is six, you skim a result the way you skim a sentence.
- 03
A calculator is a tiny editor.
Slide, type, share. Every input is in the URL. Every result is one tap from a copyable link.
- 04
Nothing more, nothing less.
No popups. No paywalls. No fake login walls. Just the math, and a little bit of personality.
Something not working? Let us know — we fix bugs fast.
From the blog
Guides and explainers for the math behind the calculators.
- 01
How to Calculate Percentages (with Examples)
Master percentage calculations for tips, discounts, grade changes, and tax. Includes the three core formulas with worked examples.
Read - 02
Cups to Grams: The Only Conversion Chart You Need
Why cups aren't reliable for baking — and a complete conversion chart for flour, sugar, butter, oats, and 15 more common ingredients.
Read - 03
How to Create a Strong Password in 2026
What makes a password actually secure — length, randomness, character types — and how to manage dozens of unique passwords without going crazy.
Read