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How to Calculate Annual Interest Amount Percentage of a number

Change the values below to see the calculation update in real time.

My loan has a % annual interest rate, and the loan amount is $ ...
How much will the interest be after a year?

Incomplete data. Enter all required values to see the calculations.

Answer: The interest you'll owe after one year is $ .

Type of calculation: Calculating a percentage of a number (interest amount).
How to use the calculator: Use the Basic Percentage Calculator (“What is A% of B?”). Enter 10 [A] and $5000 [B]. It will calculate 10% of $5000.
The formula:
We want to find 10% of $5000.
Formula: (Percentage / 100) × Loan amount
Interest = (10 / 100) × $5000 = 0.1 × $5000 = $500
For informational purposes only.

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App updated: August 2026