Free Math Tool
Percentage
6 Calculators
Percentage
Calculator
All percentage calculations in one place.
No tabs — just scroll down.
1
Basic Percentage
P × V₁ = V₂ — fill any two, solve the third
% ×
=
Answer
—
⚠ Fill exactly two fields and leave one blank.
Formula
P × V₁ = V₂
Solve P → (V₂ ÷ V₁) × 100
Solve V₁ → V₂ ÷ (P ÷ 100)
Solve V₂ → (P ÷ 100) × V₁
Example: 5% × 30 = 1.5 — leave P blank → (1.5 ÷ 30) × 100 = 5%
2
What is X% of Y?
Find the resulting value of a percentage
What is
% of
= ?
Answer
—
⚠ Please enter both a percentage and a number.
Formula
Result = (X ÷ 100) × Y
Example: 15% of 200 → (15 ÷ 100) × 200 = 30
3
X is what percent of Y?
Find what percentage one number is of another
is what % of
= ?%
Percentage
—
⚠ Enter valid numbers. Y cannot be zero.
Formula
Percentage = (X ÷ Y) × 100
Example: 25 is what % of 50? → (25 ÷ 50) × 100 = 50%
4
X is Y% of what?
Find the original whole number
is
% of what?
Whole
—
⚠ Enter valid numbers. Percentage cannot be zero.
Formula
Whole = X ÷ (Y ÷ 100)
Example: 12 is 25% of what? → 12 ÷ 0.25 = 48
5
Percentage Difference
Between two values — no reference point
Value 1
Value 2
Difference
—
⚠ Enter two valid numbers. Their average cannot be zero.
Formula
% Difference = |V₁ − V₂| ÷ ((V₁ + V₂) ÷ 2) × 100
Example: |10 − 6| ÷ 8 × 100 = 50%
6
Percentage Change
Increase or decrease a value by a percentage
%
New Value
—
⚠ Enter a valid original value and percentage.
Formula
Increase → New = Original × (1 + P÷100)
Decrease → New = Original × (1 − P÷100)
Increase: 500 + 10% → 500 × 1.10 = 550
Decrease: 500 − 10% → 500 × 0.90 = 450
Decrease: 500 − 10% → 500 × 0.90 = 450