Percent Decrease Calculator – Solve the Decrease in a Value

Find the decrease in a value by a percentage by entering the value and percent below. Use our percent increase calculator to find the increase in a value.



300 decreased by 200% = -300

Start with the formula to calculate the decrease of a value
Substitute values in the equation
Simplify and solve

decreased value=-300

How to Find Percent Decrease

Percent decrease is the change in a value by a percentage and can be found by finding the difference between the current value and the decreased value and then subtracting the difference from the current value. Use the following formula to calculate the decrease in a value by a percentage:

y = value – (value × (percent ÷ 100))

Start by finding the amount to decrease the value by multiplying the value by the percentage in decimal form(% ÷ 100). Then subtract the amount to decrease from the original value to find the decreased value.

icon with percent symbol and down arrow to symbolize percent decrease

Use our percent change calculator to measure the total amount of change in a value.

Example: Decrease 80 by 50%

y = value – (value × (percent ÷ 100))
y = 80 – (80 × (50 ÷ 100))
y = 80 – (80 × .5)
y = 80 – 40
y = 40

Decreasing a value by a percentage is also easy using the calculator above. Use our percentage calculators for more tools for calculating percent values.