PangPang ToolsOriginal price 250, discount 15%
Final price 212.5 · You save 37.5250 × (1 − 15 ÷ 100) = 212.5. Savings are 250 × 15 ÷ 100 = 37.5.
General & Math
Percentage calculator
Understand a discount, compare a part to a whole, or measure how a number changed. Choose one of four calculations and get a clear result without sending your numbers to a server.
MAKE IT SIMPLE
Result
Worked examples
Amount 250, rate 15%
37.5250 × 15 ÷ 100 = 37.5. A 15% discount removes 37.5 from the original price.
Part 18, whole 60
30%18 ÷ 60 × 100 = 30. The part represents three tenths of the whole.
Original 80, new 100
+25%(100 − 80) ÷ |80| × 100 = 25. The increase is relative to the original value.
Questions & answers
How are negative original values handled?
Change uses the absolute original value as its denominator. Moving from −80 to −60 gives +25%. This convention describes direction consistently; it is not an investment-return rule.
Can I calculate a percentage change from zero?
No. Division by zero is undefined. Use an absolute difference instead of a percentage when the original value is zero.
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