How the calculator works
- Original price
- The price you are comparing against. It must be greater than 0.
- Current price
- What you are paying for the product. It cannot be higher than the original price.
- Coupon savings
- Optional. The amount a coupon takes off the current price.
- Other savings
- Optional. Any other reduction on the product price, such as cashback you entered yourself.
- Shipping savings
- Optional. Counted only if you enter an amount. Free shipping is not assumed to be a saving.
The formulas
- Direct savings = Original price − Current price
- Total savings = Direct savings + Coupon + Other savings + Shipping savings
- Effective savings % = Total savings ÷ Original price × 100
- Effective cost = Current price − Coupon − Other savings
Worked example
Example (hypothetical numbers, not a real listing): suppose a product's original price is ₹10,000, you pay ₹8,500, and you also have a ₹500 coupon.
- Direct savings: 10,000 − 8,500 = ₹1,500.
- Total savings: 1,500 + 500 = ₹2,000.
- Effective savings: 2,000 ÷ 10,000 × 100 = 20%.
- Effective cost of the product: 8,500 − 500 = ₹8,000.
The coupon is counted once, as a separate saving. It is not also folded into the current price.
When to use it
- You paid less than the original price and want the whole saving, not just the headline discount.
- You want to see how much of your saving came from the price and how much from a coupon.
- You are comparing two purchases by how much each saved you in total.
How to read the result
Direct savings, coupon savings and other savings are listed separately so you can see where the money came from. The total adds them once each.
The percentage is only as meaningful as the original price. A large saving against an inflated original price is smaller than it looks.
Common mistakes
- Counting a coupon twice: once inside a lower current price and again as coupon savings. Enter the price you see before the coupon.
- Treating free shipping as a saving. It counts only if you enter an amount for it.
- Using an original price the product never sold at, which makes the percentage look bigger.
- Entering a current price above the original price. That is a price increase, not a saving.
Savings that last
A saving tells you what you gained on one purchase. Tracking the product lets you see whether the price stays attractive, so you can tell when it is worth buying again or recommending to someone else.