Percentage Decrease Calculator

Quickly find out how much a value has decreased in percentage terms. Just enter the original value and the new value, and our free calculator will instantly show the percentage decrease. Perfect for tracking discounts, price drops, salary reductions, or any situation where you need to see how much something has fallen.

How to Use a Percentage Decrease Calculator: Complete Guide

Percentage decrease shows how much a value has dropped compared to its original amount. You’ll see it in sales, discounts, salary reductions, price drops, and more. Understanding percentage decrease helps you make sense of changes quickly, and using a Percentage Decrease Calculator makes it even easier.

What Is Percentage Decrease?

Percentage decrease tells you the proportion of reduction relative to the original value. Instead of just saying “the price dropped by $20,” percentage decrease shows how significant that drop is.

For example:

• A $20 drop on a $50 item = 40% decrease
• A $20 drop on a $500 item = 4% decrease

The percentage makes the change easier to compare across different numbers.

The Formula for Percentage Decrease

To calculate percentage decrease:

Percentage Decrease = (Original Value – New Value) ÷ Original Value × 100

Steps:

1. Subtract the new value from the original value
2. Divide the difference by the original value
3. Multiply by 100 to get the percentage

Step-by-Step Examples

Example 1: Price Drop

A jacket was $80 and is now $60.

1. Original – New = 80 – 60 = 20
2. Divide by Original = 20 ÷ 80 = 0.25
3. Multiply by 100 = 0.25 × 100 = 25%

✅ The jacket’s price decreased by 25%.

Example 2: Salary Reduction

Salary went from $3,000 to $2,700.

1. Original – New = 3000 – 2700 = 300
2. Divide by Original = 300 ÷ 3000 = 0.1
3. Multiply by 100 = 0.1 × 100 = 10%

✅ Salary decreased by 10%.

Example 3: Population Decline

A town’s population dropped from 50,000 to 45,000.

1. Original – New = 50,000 – 45,000 = 5,000
2. Divide by Original = 5,000 ÷ 50,000 = 0.1
3. Multiply by 100 = 0.1 × 100 = 10%

✅ Population decreased by 10%.

Percentage Decrease vs. Percentage Increase

• If the new value is smaller, you get a positive percentage decrease → amount reduced
• If the new value is larger, it’s a percentage increase

Example: A product went from $150 to $180 → 180 – 150 = 30 → percentage increase = 20%

Real-Life Uses of Percentage Decrease

• Shopping & Discounts: See how much you save during sales
• Finance: Track losses, expense cuts, or investment drops
• Education: Check drops in scores or grades
• Health & Fitness: Track decreases in weight or body fat
• Business: Analyze declines in sales, revenue, or customer numbers

Why Use an Online Calculator

Manual calculations can get confusing, especially with larger numbers or repeated calculations. A Percentage Decrease Calculator gives you instant, accurate results and saves time.

Key Takeaway

To calculate percentage decrease:

(Original – New) ÷ Original × 100

Use it for prices, salaries, populations, scores, or any scenario where you need to measure how much something has fallen.