How to calculate percentage decrease?

Percentage Decrease = ((Old Value − New Value) / Old Value) × 100. If price drops from 200 to 160, decrease = (40/200) × 100 = 20%.

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Q: How do I calculate X% of a number?

To find X% of a number Y, use the formula: Result = (X / 100) × Y. For example, 20% of 500 = (20/100) × 500 = 100.

Q: How do I find what percent X is of Y?

Use the formula: Percentage = (X / Y) × 100. For example, 50 is what percent of 200? → (50/200) × 100 = 25%.

Q: How to calculate percentage increase?

Percentage Increase = ((New Value − Old Value) / Old Value) × 100. If a value goes from 80 to 100, increase = (20/80) × 100 = 25%.

Percentage (%)

Number

Please enter valid numbers in both fields.

Value (X)

Total (Y)

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Original Value

New Value

Original Value

New Value

Absolute Change

Please enter valid numbers. Original value cannot be zero.

Formulas

X% of Y

Result = (X ÷ 100) × Y

X is what % of Y

Percentage = (X ÷ Y) × 100

Percentage Change

Change% = ((New − Old) ÷ Old) × 100

How to Use

Select Mode

Choose the type of percentage calculation you need from the three tabs.

Enter Values

Type your numbers into the input fields. Decimals are supported.

Get Result

Click Calculate to see the instant result with a full breakdown.

Frequently Asked Questions

How do I calculate X% of a number?

Multiply the number by the percentage and divide by 100. Formula: Result = (X ÷ 100) × Y. Example: 20% of 500 = (20 ÷ 100) × 500 = 100.

How do I find what percent X is of Y?

Divide X by Y and multiply by 100. Formula: (X ÷ Y) × 100. Example: 50 is what percent of 200? → (50 ÷ 200) × 100 = 25%.

How to calculate percentage increase and decrease?

Percentage Change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result is an increase; a negative result is a decrease. Example: 80 → 100 = +25%; 100 → 80 = −20%.

Where are percentage questions asked in competitive exams?

Percentage is one of the most tested topics in SSC CGL, SSC CHSL, IBPS PO, SBI Clerk, CAT, and other competitive exams. Questions appear directly and also as sub-topics in Profit & Loss, SI/CI, Data Interpretation, and Ratio & Proportion.

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