Percentage & Discount Calculator — fast % math for real-world pricing. Apply a single discount (percent or flat), chain stacked discounts in the exact order they're applied, or compute the % change between two prices. You get the final price, discount amount, savings %, effective discount, and a one-click copy summary. Everything runs in your browser — nothing is stored or sent anywhere.
How to use this calculator
- Pick a tab — Discount (single), Stacked (multiple), or % Change.
- Fill the fields. For Discount: enter the original price, choose % or flat, and enter the value. Switch to Reverse mode if you only know the final price. For Stacked: enter the original price, then add discount lines (mix % and flat — order matters). For % Change: enter old and new prices to get the % change, or enter old price + % + direction to compute the new price.
- Read the result and use Copy summary to capture it for your records or listings.
Let P = original price, d = percent discount (as a decimal), f = flat discount, F = final price.
- Discount (Standard): if % → discount =
d × P; F = P − discount; savings% = discount ÷ P × 100. If flat → discount = f; F = P − f.
- Discount (Reverse): discount =
P − F; savings% = (P − F) ÷ P × 100.
- Stacked (in order): a % line →
P = P × (1 − d); a flat line → P = P − f; after all lines → F = max(P, 0); total saved = original − F; effective% = (original − F) ÷ original × 100.
- % Change: from prices →
(new − old) ÷ old × 100. Apply change → new = old × (1 ± p ÷ 100).
Inputs & outputs at a glance
Inputs
- Original price (Discount & Stacked tabs)
- Discount type & value (% or flat), or final price in Reverse mode
- Optional rounding
- Stacked: any number of lines, mixing % and flat, applied in order
- % Change: old/new prices, or old + % + direction
Outputs
- Final price and what you pay
- Discount amount and savings % (Discount tab)
- Total saved and effective discount % (Stacked tab)
- % change or computed new price (% Change tab)
- Copy summary text
Worked examples
A) Discount (Standard)
Original ₹1,000 · Type % · Value 15
→ Final price ₹850.00, discount ₹150.00, savings 15.00%
B) Discount (Reverse)
Original ₹1,000 · Final ₹799
→ Discount ₹201.00, savings 20.10%
C) Stacked discounts
Original ₹1,200 · Lines in order: 10% → flat ₹50
→ 1,200 × 0.90 = 1,080; 1,080 − 50 = ₹1,030; total saved ₹170; effective 14.17%
D) % Change
Old ₹799 · Increase 12% → new ₹894.88
Old ₹799 · New ₹699 → % change −12.52%
Tips & edge cases
- Order matters in stacked discounts: 20% then 10% is not 30% off — it's 28% effective.
- Use Reverse mode when a platform fixes the final price and you need the implied discount %.
- Rounding helps you set clean storefront prices like ₹499 or ₹899.
- For coupon + sale price, use the Stacked tab: apply the sale % first, then the flat coupon.
- If your price includes tax and you need ex-tax math, divide by
(1 + tax) before entering.
- Always sanity-check that the final price isn't below your cost.
Glossary
- Discount amount: the reduction from the original price.
- Savings %: discount amount ÷ original price × 100.
- Reverse discount: working out the discount from a known final price.
- Stacked discounts: multiple discounts applied one after another.
- Effective discount: the overall % off versus the starting price after all stacks.
- % change: the relative increase or decrease between two prices.
FAQs
Why isn't 20% + 10% the same as 30% off?
Because the second discount applies to the already-reduced price. 20% of ₹1,000 is ₹200 (leaving ₹800). 10% of ₹800 is ₹80. Total saved is ₹280, which is 28% effective — not 30%.
What's the difference between Savings % and Discount %?
They're the same in Standard mode. In Stacked mode, Savings % is the effective discount after all lines are applied in order.
When should I use Reverse mode?
When you only know the final price — for example, a fixed platform price point — and you want the implied discount % or amount behind it.
Does the calculator include tax or fees?
No. Enter the price you want to calculate against. If you need ex-tax math, divide your tax-inclusive price by (1 + tax) first, then enter that figure.
Can I stack flat and percent discounts together?
Yes — add them in the exact order they'll be applied. The tool processes each line in sequence, just like the real checkout would.
Why are my numbers slightly different after rounding?
If you enable rounding (e.g. to the nearest ₹1), the final price is adjusted after the calculation, so the savings % can shift slightly.
