The Easiest Way to Calculate Percentage Increase and Decrease

Master percentage calculations with our simple guide covering increases, decreases, and real-world applications.

Mastering Percentage Calculations

Percentages are everywhere in daily life. Here's how to calculate them quickly and accurately.

Percentage Increase Formula

Percentage Increase = ((New Value - Old Value) / Old Value) × 100

Example: Price went from $50 to $65

• Increase = (65 - 50) / 50 × 100 = 30%

Percentage Decrease Formula

Percentage Decrease = ((Old Value - New Value) / Old Value) × 100

Example: Price dropped from $80 to $60

• Decrease = (80 - 60) / 80 × 100 = 25%

Common Applications

• Sales and discounts: Calculate savings
• Investment returns: Track portfolio growth
• Salary increases: Negotiate raises
• Grade calculations: Academic performance

Quick Tip

To find X% of a number, multiply by X/100. For example, 15% of 200 = 200 × 0.15 = 30.

Try our Percentage Calculator for instant results!