Percentage Calculator

Percentage Calculator

Use this percentage calculator to solve common percentage problems quickly. You can calculate a percentage of a number, percentage increase or decrease, or determine what percent one value is of another.

Types of Percentage Calculations

1. Percentage of a Number (X% of Y)

Use this when you want to find a portion of a value.

Formula: X% of Y = (X / 100) × Y

Example: 20% of 150 = 30

2. Percentage Increase or Decrease

Use this when comparing two values to see how much they changed.

Formula: (New − Original) / Original × 100

Example: Price increases from 100 to 120 → 20% increase

3. What Percent One Number is of Another

Use this to compare two values as a percentage.

Formula: (Part / Total) × 100

Example: 25 is 25% of 100

When to Use Each Method

• X% of Y: when calculating discounts, tips, or portions
• Increase/Decrease: when tracking growth, price changes, or performance
• What %: when comparing two numbers or ratios

Real-Life Uses

• Shopping discounts
• Salary changes
• Investment growth
• Data analysis

Frequently Asked Questions

How do I calculate a percentage?

Divide the part by the total and multiply by 100.

How do I find percentage increase?

Subtract original from new value, divide by original, then multiply by 100.

Can percentages be above 100%?

Yes, values above 100% indicate growth beyond the original.

Which method should I use?

Use X% of Y for portions, increase/decrease for changes, and what % for comparisons.