30% Off Calculator
How a 30% discount works, the final price for common amounts, and the stacking mistake people make most often.
How to calculate it
Discount = price × 30 ÷ 100
Final = price × 70 ÷ 100 = price × 0.7Multiplying by the remaining share is faster than subtracting. For 30% off, multiply the price by 0.7 and that is what you pay.
30% off by price
| Original | Discount | You pay |
|---|---|---|
| 5,000 | 1,500 | 3,500 |
| 10,000 | 3,000 | 7,000 |
| 15,000 | 4,500 | 10,500 |
| 20,000 | 6,000 | 14,000 |
| 30,000 | 9,000 | 21,000 |
| 50,000 | 15,000 | 35,000 |
| 100,000 | 30,000 | 70,000 |
| 200,000 | 60,000 | 140,000 |
| 500,000 | 150,000 | 350,000 |
| 1,000,000 | 300,000 | 700,000 |
Working backwards to the original price
Original = discounted ÷ 0.7If a 30%-off price is 70,000, the original was 70,000 ÷ 0.7 = 100,000. Adding 30% back is not the same operation as dividing by 0.7.
Stacked discounts do not add up
Taking 30% off and then a further 10% is not 40% off. The second discount applies to the already-reduced amount: 0.7 × 0.9 = 0.63, an effective discount of 37%.
More percentage math
The full calculator also covers percentage change and VAT in one place.
Open Percent CalculatorFrequently asked questions
How do I calculate 30% off?
Multiply the price by 0.7 for the final amount, or by 0.3 for the discount itself.
What is 30% off 100,000?
70,000. The discount amount is 30,000.
How do stacked discounts work?
They multiply rather than add. 30% followed by 10% gives an effective 37%.
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