🔢 Finance & Math
Percentage Calculator
Find percentages, percentage change, and ratio calculations — instantly.
What is X% of Y?
% of
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What is the percentage change from Old to New value?
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X is what percentage of Y?
is ?% of
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Add or subtract a percentage from a number.
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Percentage Formulas
X% of Y
Y × X ÷ 100
% Change
((New − Old) ÷ Old) × 100
X is ?% of Y
(X ÷ Y) × 100
Add P% to N
N × (1 + P ÷ 100)
Subtract P% from N
N × (1 − P ÷ 100)
Reverse %
(Amount ÷ %) × 100
Frequently Asked Questions
People also ask — answers optimized for search engines and voice queries.
How do I calculate a percentage of a number?
To find X% of Y: multiply Y by X and divide by 100. For example, 25% of 200 = (200 × 25) ÷ 100 = 50. Use the "X% of Y" tab in the Percentage Calculator above.
How do I calculate percentage change?
Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result is an increase; a negative result is a decrease. Use the "% Change" tab above.
What is X as a percentage of Y?
To find what percentage X is of Y: (X ÷ Y) × 100. For example, 30 is what % of 120? (30 ÷ 120) × 100 = 25%. Use the "X is ?% of Y" tab above.
How do I add a percentage to a number?
To add P% to a number N: N × (1 + P/100). For example, to add 18% to ₹1,000: 1,000 × 1.18 = ₹1,180. Use the "Add/Subtract %" tab above.
How do I calculate a percentage decrease?
Percentage decrease = ((Old Value − New Value) ÷ Old Value) × 100. If a price drops from ₹500 to ₹400, the decrease is ((500−400) ÷ 500) × 100 = 20%.
What is percentage in maths?
A percentage is a number or ratio expressed as a fraction of 100. The symbol % means "per hundred". For example, 45% means 45 out of every 100 parts, or 0.45 as a decimal.