What Is the 20 Percent Off Calculator?
This calculator quickly works out how much you pay and how much you save when an item is discounted by 20%. Simply enter the original price and it returns the final sale price plus the dollar amount knocked off. It is perfect for sales, coupons, clearance events, and quick mental-math checks at the register.
How to Use It
Type the original (pre-discount) price into the box and the result updates with three numbers: the sale price you will pay, the amount you save, and a confirmation of the starting price. No currency conversion is needed — the math works the same for any currency, just read the symbol as your own.
The Formula Explained
A 20% discount means you pay 80% of the original price, because 100% − 20% = 80%. So the sale price is the original multiplied by 0.80. The amount saved is the original multiplied by 0.20 (the 20% that is removed). Together the sale price and the saved amount always add back up to the original price.
$$\text{Sale} = \text{Price} \times 0.80 \quad \text{and} \quad \text{Saved} = \text{Price} \times 0.20$$
Worked Example
Suppose a jacket costs $80. The amount saved is \(80 \times 0.20 = \$16\). The sale price is \(80 \times 0.80 = \$64\). So you pay $64 and save $16 — and \(\$64 + \$16 = \$80\), which matches the original price.
20% Off Quick Reference Table
The table below shows the amount saved and final sale price for common original prices at a 20% discount. The amount saved is \(\text{Original Price} \times 0.20\), and the sale price is \(\text{Original Price} \times (1 - 0.20) = \text{Original Price} \times 0.80\).
| Original Price | You Save (20%) | Sale Price (80%) |
|---|---|---|
| $10.00 | $2.00 | $8.00 |
| $20.00 | $4.00 | $16.00 |
| $25.00 | $5.00 | $20.00 |
| $50.00 | $10.00 | $40.00 |
| $75.00 | $15.00 | $60.00 |
| $100.00 | $20.00 | $80.00 |
| $150.00 | $30.00 | $120.00 |
| $200.00 | $40.00 | $160.00 |
| $500.00 | $100.00 | $400.00 |
For any price not listed, simply multiply by 0.80 to get the sale price, or by 0.20 to find how much you save.
FAQ
Is 20% off the same as paying 80%? Yes. Removing 20% leaves 80% of the price, so multiplying by 0.80 gives the same result as subtracting 20%.
How do I add sales tax afterward? Apply tax to the sale price. For example, with 8% tax on a $64 sale price you would pay \(64 \times 1.08 = \$69.12\).
Does this work for any price? Yes — the percentages are proportional, so it works for $5 or $5,000 the same way.
