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Simple Interest Calculator - Calculate Interest Earned

Calculate simple interest on any principal amount. Enter the principal, annual rate, and time period to see total interest and final amount.

Simple Interest Calculator

Calculate simple interest on a principal amount over a set period.

£
%

Result

Enter a principal, rate, and time period to calculate simple interest.

Formula: I = P × r × t

Simple vs compound interest: Simple interest is calculated only on the original principal. Compound interest is calculated on the principal and the accumulated interest each period, resulting in faster growth over time. Use our Compound Interest Calculator to compare.

How It Works

This calculator uses a standard formula to compute your result. Enter your values in the fields above and the answer will be calculated for you instantly.

The formula and methodology used here are based on widely accepted conventions. For critical financial or medical decisions, always cross-reference with a qualified professional.

Example

A worked example will appear here to show how the calculator can be applied to a real-world scenario.

Frequently Asked Questions

How does this calculator work?
Enter your values into the fields above and click Calculate. The result will appear instantly.
Is this calculator free to use?
Yes, all QuantlyHub calculators are completely free with no sign-up required.
How accurate are the results?
Results are calculated using standard formulas. Always verify with a qualified professional for important financial or medical decisions.

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