Percentage Increase Decrease Calculator

Calculate percent change between two values

Quick answer

Percentage Increase Decrease Calculator

Calculate percentage increase or decrease between two values. Useful for price changes, salary raises, investment returns, population growth, and comparing any before/after values.

Formula

Percent Change = ((New - Old) / Old) × 100

Formula: % Change = ((New Value - Old Value) / Old Value) × 100. Positive = increase, Negative = decrease.

Common Use Cases:

  • • Stock price changes: Was $50, now $60 = 20% increase
  • • Salary raise: Was $60k, now $66k = 10% increase
  • • Price reduction: Was $100, now $80 = 20% decrease
  • • Population growth: Was 1M, now 1.2M = 20% growth

📐Formula

Percent Change = ((New - Old) / Old) × 100

💡How it works

Calculate percentage increase or decrease between two values. Useful for price changes, salary raises, investment returns, population growth, and comparing any before/after values.

ℹ️ What is Percentage Calculator?

A percentage calculator solves three common percentage problems: finding a percentage of a number (e.g., 20% of 150), finding what percentage one number is of another (e.g., 30 is what % of 120?), and calculating the percentage change between two values. It is one of the most universally useful math tools in everyday life.

📐 Formula

P% of N = (P / 100) × N | % Change = ((New − Old) / |Old|) × 100
P— The percentage value
N— The base number
New— The new value (for % change)
Old— The original value (for % change)

✏️ Worked Example

Percentage: 15%
Number: 200
  1. 115% of 200 = (15 / 100) × 200
  2. 2= 0.15 × 200
  3. 3= 30
✅ Result: 15% of 200 = 30

💡 How to Interpret Results

  • ▸A percentage change above 0 is an increase; below 0 is a decrease.
  • ▸100% of anything = the thing itself. 200% of X = 2 times X. 50% of X = half of X.
  • ▸When comparing two percentages, use percentage points (not %) — e.g., going from 10% to 15% is a 5 percentage point increase, but a 50% relative increase.
  • ▸To add a percentage to a value: multiply by (1 + P/100). E.g., 20% increase on ₹500 = 500 × 1.20 = ₹600.
  • ▸To remove a percentage: multiply by (1 − P/100). E.g., 30% off ₹1000 = 1000 × 0.70 = ₹700.

❓ Frequently Asked Questions

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