Simple tools. A brighter everyday.
Useful calculators for
everyday work and life.
From quick calculations to everyday projects, Arithora gives you
simple, clear tools to work things out and keep moving.
Browse by category
Find the right calculator for your needs.
Work & Time
Make sense of hours, minutes, and the working day.
Money & Business
Understand costs, rates, and everyday business numbers.
Home & DIY
Measure your space and plan your next project.
School & Math
Get the answer and understand the math behind it.
Everyday
Simple answers for the little calculations in life.
Tech & Media
Work confidently with dimensions and digital measurements.
Game & Dev
Explore the numbers behind games and simulations.
Everyday favorites
A useful place to start, whatever you’re working on.
Percentage Calculator
Find a percentage, compare values, or work out a change.
Time Calculator
Add or subtract durations. Get hours, minutes, and seconds.
Square Footage Calculator
Measure a rectangular space in square feet or meters.
Tip Calculator
Work out the tip, total, and what each person pays.
Aspect Ratio Calculator
Simplify dimensions or resize without changing proportions.
Your numbers stay yours.
Calculations happen in your browser. No account, no saved inputs.
Just an answer, with the math behind it.