What the result means
See what an extra-quantity offer is worth as an equivalent percentage discount.
Example
20% extra quantity is equivalent to about 16.67% off. Compared with 15% off, the extra quantity is ahead by about 1.67 points.
How it works
Equivalent discount = extra quantity ÷ (100 + extra quantity) × 100
A common mistake
20% extra quantity is not the same as 20% off. The extra quantity is worth about 16.67% when measured against the larger total amount.
Frequently asked questions
What does 100% extra mean?
The quantity doubles, which is equivalent to 50% off.
Can I compare different products?
This calculation assumes the same product and regular price, and compares only quantity with discount percentage.