How does the discount calculator work?
This calculator handles four types of discount problems — finding sale price from a percentage, finding what percentage was applied, calculating from a fixed amount off, and totalling multi-item purchases with bulk discounts.
Sale Price = Original Price × (1 − Discount% ÷ 100)
Amount Saved = Original Price × (Discount% ÷ 100)
Discount% = ((Original − Sale) ÷ Original) × 100
🏷️ % Off mode
Enter original price and discount %. Instantly shows sale price, savings, and after-tax total.
🔍 Find % mode
Know the original and sale price? This calculates the exact discount percentage that was applied.
💵 Fixed amount off
Voucher or flat discount? Enter the original price and the fixed discount amount to see the final price and percentage equivalent.
🛒 Multi-item mode
Shopping for multiple items? Enter price, quantity, discount and tax to get the complete bill total and total savings.
Frequently asked questions
How do I calculate price after discount?
Sale Price = Original Price × (1 − Discount ÷ 100). For example, ₹2,000 with 25% off: ₹2,000 × 0.75 = ₹1,500. Use the % Off mode above for instant calculation.
How do I find what percentage discount I got?
Discount% = ((Original Price − Sale Price) ÷ Original Price) × 100. For example, an item from ₹2,000 to ₹1,500: ((2000 − 1500) ÷ 2000) × 100 = 25%. Use the "Find % Discount" tab above.
How to calculate double discount (two discounts applied)?
For a double discount (e.g. 20% off then 10% off), you cannot simply add the percentages. Final = Original × (1 − 0.20) × (1 − 0.10) = Original × 0.72. So 20% + 10% gives 28% total discount, not 30%.
How is GST / tax calculated on a discounted price?
Tax is applied to the sale price after discount. If an item is ₹2,000 with 20% off (sale price ₹1,600) and 18% GST: tax = ₹1,600 × 0.18 = ₹288. Final price = ₹1,888. The calculator handles this automatically when you enter a tax rate.
What is the highest discount allowed?
Mathematically, a discount can be up to 100% (free item). In retail, most discounts are 10%–70%. This calculator accepts any value from 0% to 99.9%.