Is buy-two-get-one better than 33% off?

Buy-two-get-one is exactly 33.33% off — you pay for two units and take home three. So it narrowly beats a 33% discount and clearly beats 30%, provided you actually want three of the item.

How do I calculate two discounts applied together?

Multiply, do not add. A 30% then 10% discount leaves 0.7 × 0.9 = 0.63 of the price, so it is 37% off, not 40%. The stacking mode does this for any number of discounts.

Does the order of discounts matter?

Not for percentages alone — 30% then 10% equals 10% then 30%. It matters as soon as a flat rupee discount is involved, because a fixed amount is worth relatively more against a smaller base.

How do I find what discount gets me to a specific price?

Use the target-price mode: enter the current price and the price you want, and it returns the percentage needed. Useful when quoting as well as when buying.

Is GST calculated before or after the discount?

After, for discounts shown on the invoice and agreed at or before the time of supply. Post-sale discounts follow different rules — check the invoice terms.

Discount Calculator

Work out stacked discounts correctly, and settle the question the shop is counting on you not asking: is 30% off actually cheaper than buy-two-get-one, or than ₹400 off?

Runs in your browser — nothing is uploaded

Price and discounts

Listed in the order the shop applies them.

MRP / list price

₹

First discount%

Then a further discount%

GST added at checkout%

Leave at 0 if the price already includes tax

You pay

₹1,260

Saved ₹740 on ₹2,000

"30% + 10% off" is really 37% off

Not 40%. The second discount comes off the already-reduced price, so it is worth less than it looks — a difference of ₹60 on this item.

Step	Off	Price before	You save	Price after
Discount 1	30%	₹2,000	₹600	₹1,400
Discount 2	10%	₹1,400	₹140	₹1,260

Why use it

Built to be genuinely useful

Compare unlike offers

Percentage off, rupees off and buy-X-get-Y ranked by what you actually pay per unit.

Discounts on discounts

'Extra 10% off already-reduced prices' is multiplicative, not additive. The real figure is shown.

Reverse solve

Enter the price you want to reach and get the discount needed to get there.

Free, no sign-up

No account, no usage cap, and no feature held back behind a paywall.

How it works

Three steps

1
Choose whether you are stacking discounts, comparing offers, or working back from a target price.
2
Enter the list price and the offers as they are advertised.
3
Read the effective discount and the per-unit price — the figures that decide it.

Why offers are phrased in different units

One shelf says 30% off. The next says ₹250 off. The third says buy two, get one free. These are not comparable by eye, and that is not an accident — a shopper who cannot compare falls back on whichever sounds biggest.

There is only one figure that settles it: what you end up paying per unit. Buy-two-get-one means paying for two and taking home three, so it is 33.3% off — better than the 30% offer and better than ₹250 off a ₹1,000 item. Convert all three and the ranking becomes obvious in a way it never is on the shelf.

The comparison mode does that conversion and shows what picking correctly is worth per unit, so you can see whether the difference is worth crossing the shop for.

Stacked discounts are smaller than they look

'Flat 30% off, plus an extra 10% at checkout' reads as 40%. It is 37%. The second discount applies to the already-reduced price, so it takes 10% of ₹1,400 rather than 10% of ₹2,000 — ₹140 instead of ₹200.

On a ₹2,000 item that is ₹60. Across a full basket it adds up, and the arithmetic is the same one shops use when advertising the two figures separately rather than the combined one.

Order matters too, once a flat rupee amount enters the stack. ₹500 off followed by 20% off is not the same as 20% off followed by ₹500 off. Enter them in the order they are actually applied.

Where GST fits

GST is charged on the transaction value after any discount that is shown on the invoice and agreed at or before the time of supply. A discount applied at the till therefore reduces the tax as well as the price.

Discounts given after the sale — a later credit note, a volume rebate — are treated differently and do not always reduce the GST already charged. If that is your situation, the invoice terms decide it, not the arithmetic.

FAQ

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