Last updated: March 2026
How to Calculate Percentage Increase
Percentage increase measures how much a value has grown relative to its original amount. It is the go-to calculation whenever something gets bigger, higher, or more expensive. The formula is simple: subtract the old value from the new value, divide by the old value, and multiply by 100 to express it as a percentage.
Salary raises are one of the most common reasons people search for a percentage increase calculator. When your employer offers a raise, knowing the percentage helps you evaluate the offer in context. A $3,000 raise on a $40,000 salary is a 7.5% increase — well above average. The same $3,000 on a $120,000 salary is only 2.5% — barely matching inflation. The dollar amount alone does not tell the full story.
Price increases affect household budgets in real ways. When rent goes from $1,400 to $1,550, that is an 10.7% increase. Grocery prices, insurance premiums, and subscription services all tend to creep up over time. Calculating the percentage increase lets you compare rate hikes across different expenses to see which ones are rising fastest and where you might need to adjust your budget.
Investment growth is measured in percentage terms for good reason: it normalizes returns across different portfolio sizes. Earning $5,000 on a $50,000 investment (10% return) is more impressive than earning $5,000 on a $500,000 investment (1% return). Percentage increase is the universal language of investment performance.
Population growth is reported as percentage increase by governments and researchers worldwide. A city growing from 500,000 to 575,000 over five years has experienced a 15% increase, or roughly 2.8% per year on a compound basis. These growth rates drive infrastructure planning, school construction, and public transportation decisions.
Business metrics rely heavily on percentage increase. Revenue growth, user acquisition, conversion rate improvements, and customer satisfaction scores are all tracked as percentage increases from one period to the next. A startup reporting 25% month-over-month growth in active users tells a much more compelling story than raw user counts alone.
Keep in mind that large percentage increases from small base numbers can be misleading. Going from 2 customers to 6 customers is a 200% increase, but it is not nearly as meaningful as going from 2,000 to 6,000. Always consider the base number alongside the percentage to get the full picture. This calculator helps you compute the increase accurately — interpreting it in context is up to you.
Frequently Asked Questions
What is the percentage increase formula?
Percentage Increase = ((New Value - Old Value) / Old Value) x 100. The result is always positive when the new value is larger than the old value. For example, an increase from 80 to 100 is ((100 - 80) / 80) x 100 = 25%.
How do I calculate a salary raise as a percentage?
Subtract your old salary from your new salary, divide by your old salary, and multiply by 100. If you went from $72,000 to $78,000, the raise is ((78,000 - 72,000) / 72,000) x 100 = 8.33%.
What is a good annual salary increase?
A typical annual raise in the United States is 3-5% to keep pace with inflation and cost of living. A promotion often comes with 10-20%. Switching companies can yield 15-30% or more. Use this calculator to evaluate any offer.
How do I calculate population growth rate?
Use the same percentage increase formula. If a city grew from 250,000 to 285,000 residents, the growth rate is ((285,000 - 250,000) / 250,000) x 100 = 14%. For annual growth rate over multiple years, divide by the number of years or use the compound annual growth rate formula.
Can a percentage increase be more than 100%?
Yes. A 100% increase means the value doubled. A 200% increase means it tripled. A 900% increase means it became 10 times the original. There is no upper limit to percentage increases.
How do I calculate the increased value from a percentage?
Multiply the original value by (1 + percentage/100). To increase 250 by 15%: 250 x 1.15 = 287.50. This is the reverse operation — given a percentage, find the new value.