Percentage Formulas You Should Know

Percentages are used everywhere — from discount shopping and GST calculation to exam scores and financial returns. Our percentage calculator covers all 6 common use cases instantly.

Use Case	Formula	Example
X% of Y	(X/100) × Y	18% of 5000 = 900
What % is Y of X?	(Y/X) × 100	45 of 60 = 75%
% Increase	((New-Old)/Old) × 100	200→250 = 25%
% Decrease	((Old-New)/Old) × 100	250→200 = 20%

How to Use This Tool

Select Calculation Mode

Choose from 6 modes — percentage of, what percent, increase/decrease, add/subtract percentage.

Enter the Values

Fill in the two input fields based on the selected mode.

Get Instant Result

The result is calculated in real-time as you type.

Frequently Asked Questions

To find X% of Y, multiply Y by X and divide by 100. Formula: (X/100) × Y. Example: 18% of ₹5,000 = (18/100) × 5,000 = ₹900.

Percentage increase = ((New Value - Old Value) / Old Value) × 100. Example: Price increased from ₹200 to ₹250. Increase = ((250-200)/200) × 100 = 25%.

Divide the part by the total and multiply by 100. Formula: (Part/Total) × 100. Example: 45 out of 60 = (45/60) × 100 = 75%.

Discount % = ((Original Price - Sale Price) / Original Price) × 100. To find sale price after discount: Sale Price = Original Price × (1 - Discount%/100). Example: ₹1,000 with 20% off = ₹1,000 × 0.80 = ₹800.

Percentage change measures how much a value has changed relative to the original value (directional). Percentage difference measures the absolute difference between two values relative to their average (non-directional). Use percentage change for tracking growth/decline over time.

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