Percentage Calculator
Select the operation below: calculate percentage value, share percentage or change percentage. Enter numbers and the result updates immediately.
Kuinka paljon on X% Y:stä?
15% arvosta 200 on
X on kuinka monta % Y:stä?
Osuus kokonaisuudesta
Kuinka monta prosenttia arvo muuttui?
Muutos
Muutos numeroina
What does percentage mean?
Percentage (%) literally means "per hundred" (lat. per centum). It is a way to express a share or ratio as part of a hundred:
- 100 % = the whole amount
- 50 % = half
- 25 % = quarter
- 1 % = one hundredth
Three functions of the percentage calculator
1. How much is X% of Y?
With this calculator, you find the concrete value when you know the percentage and the total amount.
Formula: result = (percentage ÷ 100) × value
Example: 15% discount on a 200 € product: 15 ÷ 100 × 200 = 30 €
2. What percentage is X of Y?
With this, you find out what share a certain value is of the whole.
Formula: percentage = (part ÷ whole) × 100
Example: 35 students out of 200 got grade 5: 35 ÷ 200 × 100 = 17.5 %
3. Percentage change
Percentage change tells how much a value has changed relative to the initial value.
Formula: change-% = ((end value − start value) ÷ |start value|) × 100
Example: Salary increased from 2,800 € to 3,200 €: (400 ÷ 2,800) × 100 = +14.3 %
Common percentage calculations
| Situation | Calculation method |
|---|---|
| Discounted price | price × (1 − discount% ÷ 100) |
| Increased price | price × (1 + increase% ÷ 100) |
| VAT price | net price × 1.255 (25.5 % VAT) |
| Net price from VAT | gross price ÷ 1.255 |
| How many % has been added | ((new − old) ÷ old) × 100 |
Tips for percentage calculations
- Percentage is easy to calculate in your head: 10 % = divide by ten, 5 % = divide by twenty, 20 % = fifth
- Mnemonic: "Percentage" × "Whole" ÷ 100 = value
- Percentage change is not symmetric: +50 % and then −50 % does not return to the original value (but stays at 75 %)
See also discount calculator or VAT calculator for practical commerce calculations!
