SI
Simple Interest Calculator
Interest and total payable on a simple-interest loan.
Interest earned
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Total amount
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Calculate simple interest on a loan
Simple interest is principal × rate × time. This page also shows the total payable.
Common for short-term loans where interest does not compound.
For compounding, switch to the Compound Interest Calculator.
simple interest calculator FAQ
How do I use this Simple Interest Calculator?
Fill in the fields above. The result updates as you type. Empty fields stay blank until you enter a valid number or text.
Is the Simple Interest Calculator free?
Yes. Every SmartToolX calculator and converter is free. There is no paywalled result.
Does this Simple Interest Calculator save my data?
No. Inputs stay in your browser unless a tool needs a public API, such as live currency rates or QR image rendering.
How accurate is this Simple Interest Calculator?
We use the same published formulas you would expect from a standard simple interest calculator. Always double-check medical, legal, or large money decisions.
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