Calculate the percentage decrease between two values instantly. Enter the original value and the new value to find the exact percent drop - ideal for discounts, price reductions, stock losses, and depreciation.
Looking for growth? Try our Percentage Increase Calculator, or use the all-in-one Percentage Calculator for any percentage problem.
Calculate percentage decrease, discounts, and value reduction instantly.
The formula for calculating percentage decrease is straightforward:
Percentage Decrease =
The result tells you how much the value has decreased in percentage form compared to the starting amount. For example, a result of 25% means the value dropped by one-quarter of its original size.
A jacket originally priced at $200 is on sale for $150. How much did the price decrease?
Step 1: Find the decrease: 200 - 150 = 50
Step 2: Divide by the original: 50 / 200 = 0.25
Step 3: Multiply by 100: 0.25 x 100 = 25%
The jacket price decreased by 25%.Learn more
You bought shares at $500 and they are now worth $350. What is the percentage loss?
Step 1: Decrease: 500 - 350 = 150
Step 2: Divide by original: 150 / 500 = 0.30
Step 3: Convert: 0.30 x 100 = 30%
The stock value decreased by 30%. Note: a 30% loss requires a ~43% gain to break even - decrease and increase percentages are not symmetric.
A car purchased for $35,000 is now worth $24,500 after three years.
Step 1: Decrease: 35,000 - 24,500 = 10,500
Step 2: Divide: 10,500 / 35,000 = 0.30
Step 3: Convert: 0.30 x 100 = 30%
The car depreciated by 30% over three years, roughly 10% per year on average.
A percentage decrease calculator is a math tool that measures how much a value has dropped compared to its original size, expressed as a percentage. It takes two inputs - the original value and the new, lower value - and returns the exact percentage decrease using a standard mathematical formula.
This calculator is used across many fields: finance (stock losses, depreciation), retail (discounts, markdowns), economics (inflation-adjusted declines), business (revenue and profit changes), health (weight loss tracking), education (grade changes), and statistics (population or data-point decline).
The inverse is also important: if something decreases by 25%, the remaining value is 75% of the original - not 75% of the new value. Understanding this asymmetry is critical in finance and investing.
Learn more about percentages on WikipediaPercentage decrease and percentage increase are related but distinct. They are not symmetric - a 50% decrease does not undo a 50% increase.
Key Example: Why They Are Not Symmetric
If a stock drops from $100 to $50, that is a 50% decrease.
But to recover from $50 back to $100, the stock needs a 100% increase.
The base value changes, so the percentages are different.
| Aspect | Percentage Decrease | Percentage Increase |
|---|---|---|
| When to use | Value has gone down | Value has gone up |
| Formula | (Original - New) / Original x 100 | (New - Original) / Original x 100 |
| Example | $200 to $150 = 25% decrease | $150 to $200 = 33.33% increase |
Percentage decrease is one of the most widely used calculations in everyday life and professional settings:
| Scenario | Original to New | Decrease % |
|---|---|---|
| Sale discount | $200 to $150 | 25% |
| Stock loss | $100 to $80 | 20% |
| Revenue decline | $10,000 to $8,000 | 20% |
| Weight loss | 200 lb to 180 lb | 10% |
| Car depreciation | $35,000 to $28,000 | 20% |
| Population decline | 50,000 to 42,500 | 15% |
Sometimes you know the original value and the percentage decrease, and you need to find the new value:
New Value =
A store offers a 30% discount on a $500 laptop. What is the sale price?
Step 1: Convert: 30% = 0.30
Step 2: Multiplier: 1 - 0.30 = 0.70
Step 3: Multiply: 500 x 0.70 = $350
This calculator provides mathematically accurate results based on the standard percentage decrease formula. For financial, accounting, tax, or professional use, always verify results independently and consult qualified professionals where appropriate.
Percentage decrease calculations assume the original value is the base. If you need to calculate how much an increase must be to recover from a decrease, that requires a different formula (percentage increase from the reduced value).
A percentage decrease calculator determines how much a value has dropped as a percentage of the original. Enter the original value and the new (lower) value, and the calculator returns the exact percentage decrease using the standard formula: ((Original - New) / Original) x 100.
Content Updated At : 08/30/2026