How to Calculate Percentage Increase in Monthly Rent

Getting a letter from your landlord about a rent increase is never fun. But before you panic or sign a new lease, it's important to know exactly how much your rent is actually going up in percentage terms.

Knowing the percentage increase helps you compare your rent hike against inflation, local market averages, and your own salary growth.

The Basic Formula

To calculate the percentage increase manually, you use this simple math: **((New Rent - Old Rent) / Old Rent) * 100 = Percentage Increase

For example, if your rent was $1,500 and it’s going up to $1,650:

Subtract the old from the new: $1,650 - $1,500 = $150

Divide by the old rent: $150 / $1,500 = 0.1**

Multiply by 100: 0.1 * 100 = 10%

The Faster Way (Zero Math Required)

If you don't want to pull out a calculator or risk a math error, you can use our Percentage Calculator. Just plug in your old rent and the increase amount (or the new total), and it will give you the percentage instantly.

Why Does This Matter?

Negotiation: If the increase is significantly higher than the local average (e.g., 15% when the average is 5%), you have data to negotiate with your landlord.

Budgeting: Knowing the percentage helps you adjust your other monthly expenses accordingly.

Legal Limits: Some cities have rent control laws that cap increases at a certain percentage (e.g., 3% or 5%). Calculating the exact percentage ensures your landlord is following the law.

Need to figure out how much you'll save if you negotiate a discount? Check out our Discount Calculator as well!