Free Online Calculators for Percentages, Tips, Grades & Everyday Math
NumoCrunch gives you instant answers, formulas, visual results, and step-by-step explanations. Search or choose a calculator below.
Search all 9 calculators by name, keyword or formula
Popular Calculators
- Tip CalculatorWork out the gratuity and split the bill between friends.Bill × Tip %
- Decrease by PercentageReduce any number by a percentage and see the amount removed.X × (1 − Y ÷ 100)
- Increase by PercentageAdd a percentage on top of a starting amount.X × (1 + Y ÷ 100)
- Test Score CalculatorCalculate your percentage grade, letter grade and questions you can miss.Correct ÷ Total × 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
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
Free Calculators That Show the Math
NumoCrunch calculators are designed to do more than show a number. Each tool gives you the formula, visual result, and step-by-step explanation so you can understand how the answer was calculated.
Start with the Percentage Calculators for shares, reductions and reverse percentages, work out gratuity and split a bill with the Tip Calculator, turn correct answers into a grade with the Test Score Calculator, or compare two values with the Percent Change Calculator.
Nothing is uploaded — the arithmetic runs in your browser, so answers appear instantly and your numbers stay on your device.