All Calculators
Browse every NumoCrunch calculator or choose a category to find the tool you need. All 9 tools show the formula, an instant result and the calculation worked out with your own numbers.
Search all 9 calculators by name, keyword or formula
Everyday Calculators
Money and day-to-day math: tips, bill splitting and reductions.
School & Math Calculators
Grades, fractions and classroom percentage work, explained step by step.
Percentage Calculators
Every core percentage operation, each with its own worked explanation.
- What Percent Is X of YFind what percentage one value is of another.X ÷ Y × 100
- What Is X% of YFind a percentage of a known number.X × Y ÷ 100
- Reverse Percentage — X Is Y% of WhatFind the original whole when you know the part and percentage.X ÷ (Y ÷ 100)
- Percent ChangeFind the percentage increase or decrease between two values.(Y − X) ÷ X × 100