Percent Off Calculator
Common Discounts
Related Calculators
Understanding Percentage Discounts
How to Calculate Discounts
Sale Price = Original Price x (1 - Discount%/100)
Savings = Original Price x (Discount%/100)
Example: $80 with 25% off = $80 x 0.75 = $60
Stacking Discounts
When multiple discounts apply, they are typically calculated sequentially, not added together. For example, 20% off then 10% off is NOT the same as 30% off.
Example: Stacking 20% + 10%
$100 with 20% off = $80
$80 with additional 10% off = $72
Total discount: 28% (not 30%)
Mental Math Tricks
For 10% Off
Move the decimal one place left
$45 → $4.50 savings
For 25% Off
Divide by 4
$80 / 4 = $20 savings
For 50% Off
Divide by 2
$60 / 2 = $30 savings
For 15% Off
Calculate 10% + half of that
$40 → $4 + $2 = $6 savings
Shopping Tip
Always calculate the final price, not just the discount percentage. A 50% discount on an inflated price might still be more expensive than a 20% discount on a competitively priced item.
Frequently Asked Questions
How do I calculate the sale price after a discount?
Multiply the original price by (100 - discount percent) / 100. For 25% off $80: $80 x 0.75 = $60. Or calculate savings first: $80 x 0.25 = $20 off, then $80 - $20 = $60.
How do stacking discounts work?
Multiple discounts apply sequentially, not additively. For 20% off then 10% off $100: First discount gives $80, second discount gives $80 x 0.90 = $72. Total savings is 28%, not 30%.
How do I calculate what percent off something is?
Divide the discount amount by the original price, then multiply by 100. If a $50 item is now $35, the discount is: ($50-$35)/$50 x 100 = 30% off.
What's a quick way to calculate 10% off?
Move the decimal point one place left. For $45, 10% = $4.50. For other percentages: 20% = double 10%, 5% = half of 10%, 15% = 10% + 5%, 25% = divide by 4.