The formula new_value-old_valueold_value can help you quickly calculate the percentage change between two numbers. To calculate a percentage change you need to calculate the difference divide the change by the original value and then multiply that amount by 100. Calculate the change X.
Use the Percentage Decrease Calculator to find the percent decrease from one value to another.
B A X. Subtract the original value from the new value. Click the calculate button. To calculate the percent difference between a final value and an initial value also called percent charge you subtract the initial value from the final value divide this by the initial value and multiply the result by 100 to convert the decimal value into a percentage as the answer.