30% off $20
See exactly how much you save and the final price for 30% off $20. Adjust either number below to check a different sale.
Price After
$14.00
Amount Off
$6.00
Percent Off
30.0%
Example
Taking 30.0% off a $20.00 item saves $6.00, dropping the price to $14.00.
Original price split between what you keep paying and what you save
- Price After: $14.00
- Amount Off: $6.00
What is a Percent Off Calculator?
A percent off calculator answers one specific shopping question: "what does X% off $Y actually cost me?" Type in the price tag on the item and the percentage advertised on the sale sign, and it returns the two numbers that matter at checkout — the amount knocked off the price, and the final price you'll actually pay.
Percentage-based sales are how most retailers advertise discounts, from a "20% off" clearance rack to a "70% off" doorbuster. Unlike a flat dollar coupon, a percent-off deal scales with the price of the item, so the same "30% off" banner saves a different dollar amount on a $20 t-shirt than it does on a $200 jacket — this tool does that scaling math for you instantly.
How Percent Off Works
The direct calculation multiplies the price by the percent off, then subtracts that from the original price:
A faster one-step version skips the subtraction entirely: if an item is "X% off," you're paying for the remaining "(100 − X)%" of it. For a 20% off item, you pay 80% of the sticker price outright — so a $279 jacket at 20% off is simply 0.80 × $279 = $223.20, with no second step needed.
Common Percent-Off Reference Table
These are the savings and final price for a $100 item at the percentages retailers use most often — since the math is linear, you can scale any row up or down for a different price (for a $200 item, double every dollar amount below).
| Percent Off | Amount Off ($100 item) | Price After |
|---|---|---|
| 10% | $10.00 | $90.00 |
| 15% | $15.00 | $85.00 |
| 20% | $20.00 | $80.00 |
| 25% | $25.00 | $75.00 |
| 30% | $30.00 | $70.00 |
| 40% | $40.00 | $60.00 |
| 50% | $50.00 | $50.00 |
| 70% | $70.00 | $30.00 |
Quick Mental Math for Percent Off
A few benchmark percentages cover most real-world sales without needing a calculator. 10% off is just moving the decimal point one place left (10% of $84 is $8.40). 50% off is always half the price. 25% off is a quarter, which you can find by halving twice (half of $84 is $42, half of that is $21 — so 25% off $84 saves $21). For an awkward number like 15%, add the 10% figure to half of it — 10% of $84 ($8.40) plus half of that ($4.20) equals $12.60 saved, the same as 15%.
Stacking Two Percent-Off Discounts
When a "30% off" sale is combined with an extra "20% off" coupon at checkout, the two percentages do not add up to 50% off. The second discount is applied to the already-reduced price, not the original one. On an $80 pair of sneakers, 30% off first brings the price to $56; an additional 20% off that $56 takes off $11.20, landing at $44.80. The total saved is $35.20 — 44% of the original $80, not 50%. Multiplying the "keep" percentages together (0.70 × 0.80 = 0.56, meaning you pay 56%) gets you straight to the answer without the intermediate step.
Example — Your Current Inputs
Taking 30.0% off a $20.00 item saves $6.00, dropping the price to $14.00.
Additional Example — Flash-Sale Sneakers
A pair of sneakers is tagged at $80 for a 24-hour flash sale advertising "35% off." The amount off is $80 × 0.35 = $28.00, so the price after the discount is $52.00. Using the one-step shortcut, you're paying for the remaining 65% of the shoe: 0.65 × $80 also comes out to $52.00 — the same answer, one step faster.
About These Parameters
- Original Price
- The full price of the item before the sale — the number printed on the tag, the "regular price" struck through on a product page, or the subtotal before any promotion is applied at checkout. This is the base the percentage is calculated against, so it must be the pre-discount price, not a price you've already adjusted yourself.
- Percent Off
- The percentage advertised on the sale — 10% for a small storewide discount, 50% for a clearance rack, up to 70% or more for a closeout sale. A typical realistic value falls between 10% and 50%; entering 100% would mean the item is free, which the calculator still computes correctly but is rare outside of promotional giveaways.
Frequently Asked Questions
How do I calculate 15% off $50 without a calculator?
Find 10% of $50 first by moving the decimal point one place ($5.00), then add half of that amount ($2.50). Together that's $7.50 off, so the sale price is $42.50. This 10%-plus-half trick works for any 15% calculation and only takes two easy steps.
Why does "20% off" save a different dollar amount on every item?
Because a percentage is relative to the price it's applied to. 20% off a $50 item saves $10, while 20% off a $500 item saves $100 — ten times more, because the base price is ten times larger. The percentage stays constant; only the dollar amount scales with the price.
Does 30% off plus an extra 20% off equal 50% off total?
No. Stacked percentages don't add together because the second discount is calculated on the already-reduced price, not the original one. 30% off followed by 20% off works out to a 44% total discount, not 50% — always slightly less than the sum of the two percentages.
What does entering 100% off mean?
A 100% discount makes the amount off equal to the full original price, leaving a price after of $0.00. The calculator handles this correctly, though in practice a 100%-off deal usually signals a free promotional item or gift rather than a typical retail sale.