Percentage Calculator
Calculate how much something has dropped as a percentage. Enter the original and new values to find the exact percent decrease — useful for discounts, price drops, and loss metrics.
Specific percentage calculators:
How it works
This percentage calculator runs entirely in your browser — no data is sent to any server. Simply fill in the fields above and the result updates instantly. You can copy the output with the copy button provided.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 = (20 × 150) / 100 = 30.
How do I calculate percentage increase?
Percentage increase = ((New Value - Old Value) / Old Value) × 100. For example, from 80 to 100 is a 25% increase.
How do I find what percentage one number is of another?
Divide the first number by the second, then multiply by 100. For example, 30 is what % of 200? (30/200) × 100 = 15%.