Simple Interest Calculator
Calculate simple interest, total cost, and monthly payments. Enter principal, rate, and time to view the breakdown. 100% private and offline.
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Total amount
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Principal
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Interest
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Monthly payment
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About the author
Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: .
Frequently asked questions
Simple = P×R×T/100 on principal only; compound earns on interest too.
No, for informational purposes only. Consult a qualified professional before making finance decisions.
Yes, it is free, works offline in your browser, and your data never leaves your device.
How to use Simple Interest Calculator
- Enter principal: Enter principal amount.
- Set rate & time: Enter rate and years.
- View: See interest, total and monthly.