Calculate Sale Prices, Savings & Double Discounts
Free discount calculator with double discount support and GST. Calculate effective discount percentage, price after all discounts, and final price including tax. Perfect for Flipkart/Amazon sale shopping.
How It Works
Savings = Price × (D₁/100) + (Price - D₁) × (D₂/100); Effective = Savings/Price × 100The first discount reduces the original price. The second discount (if any) applies to the already-discounted price, not the original. This means two 50% discounts do NOT make it free — they make it 75% off. The effective discount shows the combined percentage saved.
Quick Tips
Double Discount Trap
Two 50% off discounts = 75% off, NOT 100% off. The second discount applies to the already-reduced price.
GST on Discount
In India, GST is calculated on the post-discount price, not the MRP. A ₹1000 item at 20% off + 18% GST = ₹800 + ₹144 = ₹944.
Effective Rate
A 20% + 10% double discount = 28% effective discount (not 30%). Our calculator shows the real combined savings.
Student Discounts
Amazon Prime Student: 50% off. Apple Education: ~10% off. Spotify Student: 50% off. Always check for student deals before buying.
Step-by-Step Instructions
- 1Enter the original price of the item.
- 2Set the discount percentage (first discount).
- 3Add an additional discount if applicable (e.g., coupon code).
- 4Set GST rate if you want the final price including tax.
Frequently Asked Questions
How do I calculate 20% off?▼
Multiply the price by 0.20 to get the savings, then subtract from original price. For ₹5000 at 20% off: savings = ₹1000, final price = ₹4000.
What is effective discount?▼
Effective discount is the total percentage saved from the original price. With double discounts of 20% + 10%, you save ₹280 on ₹1000 = 28% effective discount (not 30%).
Is GST applied before or after discount?▼
After discount. GST is calculated on the discounted price. For example, ₹1000 item with 20% discount: GST applies to ₹800, not ₹1000.
How do I calculate price after discount and GST?▼
Apply discount first: Price × (1 - Discount%). Then add GST: Discounted Price × (1 + GST%). Our calculator does both steps automatically.