What Is the 30 Percent Off Calculator?
This calculator quickly tells you how much an item costs after a 30% discount and how much money you save. Just enter the original price and you instantly get the final sale price plus the dollar amount taken off. It is perfect for shopping during sales, clearance events, and promotional offers where signs read "30% off."
How to Use It
Type the original (pre-discount) price into the box and the calculator does the rest. It multiplies the price by \(0.70\) to get what you pay, and by \(0.30\) to get what you save. No need to convert percentages or do mental math at the register.
The Formula Explained
A 30% discount means you pay 70% of the original price, since \(100\% - 30\% = 70\%\). The sale price is therefore $$\text{Sale} = \text{Price} \times 0.70$$ and the savings is $$\text{Saved} = \text{Price} \times 0.30$$ Together the sale price and the savings always add back up to the original price.
Worked Example
Suppose a jacket is priced at $80. The amount saved is $$80 \times 0.30 = \$24$$ The sale price is $$80 \times 0.70 = \$56$$ So you pay $56 and save $24. Check: \(\$56 + \$24 = \$80\), the original price.
30% Off Price Reference Table
Taking 30% off a price means you pay 70% of the original amount. The amount you save is found with \(\text{Savings} = \text{Original Price} \times 0.30\), and the sale price is \(\text{Sale Price} = \text{Original Price} \times (1 - 0.30) = \text{Original Price} \times 0.70\).
For example, on a $100 item you save \(100 \times 0.30 = \$30\), leaving a sale price of \(100 \times 0.70 = \$70\). The table below applies the same calculation to a range of common prices.
| Original Price | Amount Saved (30%) | Sale Price (70%) |
|---|---|---|
| $10.00 | $3.00 | $7.00 |
| $20.00 | $6.00 | $14.00 |
| $25.00 | $7.50 | $17.50 |
| $50.00 | $15.00 | $35.00 |
| $75.00 | $22.50 | $52.50 |
| $100.00 | $30.00 | $70.00 |
| $150.00 | $45.00 | $105.00 |
| $200.00 | $60.00 | $140.00 |
FAQ
How do I calculate 30% off in my head? Take 10% of the price (move the decimal one place left), multiply by 3 to get the discount, then subtract it from the original price.
Does this include sales tax? No. The result is the pre-tax discounted price. Add any applicable sales tax afterward.
Can I use it for other discounts? This tool is tuned for 30% off. For other percentages, look for the matching "X percent off" calculator.
