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Percentage Decrease Calculator

See by what percentage a price, weight, bill or score has gone down. Or pick 'Decrease a number by %' to take a discount off.

Percentage decrease

20%

Decrease
Difference
−100
Change (with sign)
−20%
Multiplier
0.8 ×
Show working
  1. 400 − 500 = −100
  2. −100 ÷ 500 = −0.2
  3. −0.2 × 100 = −20%

How to use

  1. Type the old value and the new, lower value.
  2. Read the percentage decrease and the amount it fell by.
  3. For a discount, choose 'Decrease a number by %' and type the price and the discount.

Good to know

Percentage decrease = (old − new) ÷ old × 100. If your electricity bill falls from ₹2,400 to ₹1,800, the drop is ₹600, and 600 ÷ 2,400 × 100 = 25%.

To take a percentage off, multiply by (1 − percentage ÷ 100). A 30% discount on ₹1,999 is 1,999 × 0.70 = ₹1,399.30. Two discounts in a row multiply: 20% off and then a further 10% is 0.8 × 0.9 = 0.72, so 28% off in total, not 30%.

A decrease can never be more than 100%, which would mean the value fell to zero. Because decreases are measured from the higher starting value, a 25% fall needs a 33.3% rise to get back to where you were.

Questions

How do I calculate the discount percentage?

(MRP − selling price) ÷ MRP × 100. A ₹1,500 item sold for ₹1,200 has a 300 ÷ 1,500 × 100 = 20% discount.

How do I take 15% off a price?

Multiply by 0.85. ₹2,000 × 0.85 = ₹1,700. Choose 'Decrease a number by %' to do it here.

If something falls 50% and then rises 50%, is it back to the start?

No. 100 falls to 50, and 50% of 50 is 25, so it only gets back to 75. Each change is a percentage of a different starting value.

Can I find the price before a discount?

Yes. Divide the sale price by (1 − discount ÷ 100). ₹1,400 after 30% off was 1,400 ÷ 0.7 = ₹2,000. Use the 'Value before a % change' mode and choose Decrease.

What if the new value is higher?

Then it is an increase; the calculator shows the percentage increase and labels it so you don't misread it.

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