Updated: August 2026 • Verified v1.2
Simple Interest Formula (I = P × r × t) Calculator
Finance & MathPopularLocal Browser Execution: Your input is processed locally in your browser and is not sent to UTL servers.
Simple Interest: I = Principal * Rate * Time; Total Balance = Principal + IWas this calculation helpful?
Understanding Your Results
Calculates simple interest ($I = P imes r imes t$), total future balance, year-by-year schedule, and shows the compound interest delta.
Practical Guidance & Next Steps
Simple interest does not compound: interest is calculated only on the original principal balance each period.
What is this?
A financial mathematics utility that computes simple non-compounding interest on principal loans and deposits.
How does it work?
1. Enter starting principal amount ($).
2. Enter annual interest rate (% APR) and time duration (years).
3. View total simple interest earned, future balance, and compound interest delta.
Why use it?
Essential for calculating auto loans, short-term promissory notes, and classroom math assignments.
Technical Scope & Calculation Limitations
Calculates non-compounding simple interest.
Frequently Asked Questions
The formula is `I = P × r × t`, where `I` is Interest, `P` is Principal, `r` is Annual Interest Rate (as a decimal), and `t` is Time in years.
Windows Desktop & Widget Options
All Windows widgets Want this capability on your Windows desktop?
Windows 11 Widget
8.8/10
MSN Money Watchlist Widget
Built-in Windows 11 Widgets Board stock ticker and market watchlist feed.
FreeEasy InstallLow RAM
By Microsoft CorporationView Widget
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