Simple Interest Calculator
P × R × T made easy with clear breakdown.
Amortization schedule
| # | Payment | Principal | Interest | Balance |
|---|---|---|---|---|
Showing first 12 of months.
Growth over time
| Year | Invested | Value |
|---|---|---|
Introduction
Simple Interest Calculator — P × R × T made easy with clear breakdown. Enter Principal, Rate (%), Years to get an instant, accurate result.
Formula
Interest = P × r × t / 100, where P is principal, r is the annual rate (%), and t is years.
Step-by-step
- Enter the Principal.
- Enter the Rate (%).
- Enter the Years.
- Click Calculate to see your result instantly.
Real-world example
Example: With Principal = 10000, Rate (%) = 6, Years = 3, the Simple Interest Calculator gives Interest: 1800, Total: 11800.
Frequently Asked Questions
How is this different from compound interest?
Simple interest is only ever calculated on the original principal, never on previously earned interest.
Is total = principal + interest?
Yes, the total repayable/returned amount is the principal plus the simple interest earned or owed.
What inputs does the Simple Interest Calculator need?
You'll need to provide: Principal, Rate (%), Years. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Simple Interest Calculator?
The Simple Interest Calculator applies the formula exactly as calculated — Interest = P × r × t / 100, where P is principal, r is the annual rate (%), and t is years. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Are these results guaranteed?
No. The Simple Interest Calculator gives an estimate based on the numbers you enter and standard financial formulas — actual rates, fees, taxes, and terms vary by lender, institution, and jurisdiction, and can change over time. This is not financial advice; consult a qualified financial professional for decisions specific to your situation.
Is the Simple Interest Calculator free to use?
Yes, the Simple Interest Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Simple Interest Calculator
The Simple Interest Calculator uses a real, verifiable formula — Interest = P × r × t / 100, where P is principal, r is the annual rate (%), and t is years. — so results are accurate every time, not an approximation.