Percentage Decrease Calculator
Calculate the percentage decrease from an original value to a lower new value.
- Free to use
- Accurate results
- No registration required
- Works on all devices
Enter an original value and a lower new value to calculate the percentage decrease between them.
The starting value, before the decrease.
The value after the decrease.
Your result
-20.00%
Percentage decrease
Decrease amount-50
AI explanation
Formula
Decrease % = (Old − New) / |Old| × 100Worked example
250 decreases to 200
| Field | Value |
|---|---|
| Original value | 250 |
| New (lower) value | 200 |
| Decrease amount | -50 |
| Percentage decrease | -20 |
Assumptions
- The underlying calculation reports New − Old, so a genuine decrease appears as a negative changeAmount and changePct — this page frames the magnitude as a decrease for readability.
- The original value cannot be zero.
Frequently asked questions
How do I calculate percentage decrease?
Subtract the new value from the original value to get the decrease amount, divide by the original value, then multiply by 100.
Why does the result show a negative number?
The underlying formula is New − Old, so a decrease naturally produces a negative value — the magnitude (ignoring the sign) is the percentage decrease.
Is this the same as a discount percentage?
Yes, conceptually — a discount is a percentage decrease from an original price to a sale price. Use the Discount Calculator for a shopping-specific version with "you save" framing.