Percentage Decrease Calculator
To decrease a number by a percentage, multiply the number by (1 − percent ÷ 100): new value = value × (1 − percent ÷ 100).
Last updated 2026-08-14
Embed on your site
Embed this calculator on your site:
<iframe src="https://calculopedia.darzh.xyz/embed/percentage-decrease-calculator/" width="100%" height="700" style="border:0;border-radius:12px" loading="lazy"></iframe>
quizExample
How this calculator works, with real numbers (no JavaScript needed):
Inputs
- Original number
- 2000
- Decrease by
- 25
Results
- New value
- 1,500
- Amount saved / reduced
- 500
functionsThe formula
A percentage decrease answers "what does the number become after going down by X%?" — a discount, a price cut, a pay reduction or a drop in usage.
The formula
New value = value × (1 − percent ÷ 100)
Or in two steps: find the decrease, then subtract it.
Worked example
₹2,000 with a 25% discount:
Decrease = 2,000 × 25 ÷ 100 = ₹500
New value = 2,000 − 500 = ₹1,500
Using the one-line formula: 2,000 × 0.75 = ₹1,500.
Why 1 − percent ÷ 100?
"Take 25% off" means you keep 75% of the original. 75% as a decimal is 0.75, so you multiply by 0.75. Take 10% off → multiply by 0.90; take 50% off → multiply by 0.50.
Everyday uses
- Discounts and sales — "40% off" on a ₹3,000 item → 3,000 × 0.60 = ₹1,800
- Price cuts — a product falling 15% from ₹1,000 to ₹850
- Expense reduction — cutting a budget line by 20%
- Battery/depreciation — any "down by X%" situation
Want the reverse — add a percentage? See the percentage increase calculator.
helpFrequently asked questions
question_markHow do I take a percentage off a number?
Multiply the number by (1 − percent ÷ 100). For example, 25% off 2,000 gives 2,000 × 0.75 = 1,500.
question_markWhat is 40% off 3,000?
3,000 × 0.60 = 1,800. You save 1,200 and pay 1,800.
question_markWhat is the formula for percentage decrease?
New value = original × (1 − percent ÷ 100). The decrease itself is original × percent ÷ 100.