Percentage Decrease Calculator 2025: Find Discounts & Drops (Free)
In a world of sales, discounts, and fluctuating markets, understanding percentage decrease is essential. Whether you are a shopper trying to figure out how much you'll save on a deal, or a business owner analyzing a drop in sales, knowing how to calculate the decline is key to making smart decisions.
This guide will explain exactly what percentage decrease is, provide the formula you need, and walk you through practical examples so you can calculate it with confidence.
What is Percentage Decrease?
Percentage decrease measures the reduction in value of a variable, expressed as a percentage of its original value. It answers the question: "How much smaller is this number now compared to what it used to be?"
- Discounts: "20% off" means the price has decreased by 20%.
- Depreciation: How much value a car loses over time.
- Weight Loss: Tracking progress in a fitness journey.
- Business Metrics: Analyzing drops in revenue or customer retention.
Percentage Decrease = ((Original Value - New Value) / Original Value) × 100
Original Value: The starting number (must be larger).
New Value: The ending number (must be smaller).
Difference: The amount lost or reduced.
Step-by-Step Calculation Guide
Scenario: Buying a Laptop on Sale
A laptop was originally priced at $1,000, but it is now on sale for $800.
- Find the Difference: $1000 - $800 = $200
- Divide by Original: $200 / $1000 = 0.20
- Convert to %: 0.20 × 100 = 20%
Result: The laptop is 20% off.
Real-Life Examples
Bought: $30k | Now: $24k
20% Value Loss
Start: 200lbs | Now: 180lbs
10% Body Weight
Old Bill: $150 | New: $90
40% Savings
Frequently Asked Questions
To decrease a number by 20%, multiply it by 0.80 (since 100% - 20% = 80%). Example: 50 × 0.80 = 40.
Percentage decrease is a specific type of percentage change where the value goes down. Percentage change covers both increases and decreases.
Yes! Decreasing a number by 50% is exactly the same as cutting it in half.
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