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Simple Interest Calculator
Estimate simple interest, total value, annual interest, and periodic interest income using starting principal, annual rate, and years without compounding.
Simple Interest Calculator
Use this free simple interest calculator to estimate interest earned, total value, and periodic interest income from a starting principal, annual rate, and time period. It is designed for clean non-compounding calculations, so it works well for finance homework, loan illustrations, quick investment estimates, and side-by-side comparisons against the Compound Interest Calculator, the Future Value Calculator, and the wider Financial Calculators category.
Formula used: Interest = Principal x Rate x Time.
Result
Simple interest viewYou can earn $208.33 monthly in simple interest.
Total after 120 periods$75,000.00
Total simple interest$25,000.00
Annual interest$2,500.00
Periodic interest$208.33
Starting principal
$50,000.00
Interest rate
5.0%
Term
10 years
Total value
$75,000.00
Interest breakdown
$75,000.00
Principal
$50,000.00 | 67%
Interest
$25,000.00 | 33%
Balance graph
BalanceInterest per year
Simple interest balances
Year-by-year view of beginning balance, simple interest earned, and ending balance using the original principal as the interest base.
| Year | Beginning balance | Interest earned | Ending balance |
|---|---|---|---|
| 1. | $50,000.00 | $2,500.00 | $52,500.00 |
| 2. | $52,500.00 | $2,500.00 | $55,000.00 |
| 3. | $55,000.00 | $2,500.00 | $57,500.00 |
| 4. | $57,500.00 | $2,500.00 | $60,000.00 |
| 5. | $60,000.00 | $2,500.00 | $62,500.00 |
| 6. | $62,500.00 | $2,500.00 | $65,000.00 |
| 7. | $65,000.00 | $2,500.00 | $67,500.00 |
| 8. | $67,500.00 | $2,500.00 | $70,000.00 |
| 9. | $70,000.00 | $2,500.00 | $72,500.00 |
| 10. | $72,500.00 | $2,500.00 | $75,000.00 |
What is a simple interest calculator?
A simple interest calculator is a finance tool that estimates interest using only the original principal. That means the interest amount stays linear instead of accelerating over time. It is useful when you want a clean baseline estimate for a loan, a note, or a basic return scenario without compounding.
This makes it especially useful for teaching, quick comparisons, and early-stage planning. If you want to compare linear growth with reinvested growth, continue into the Compound Interest Calculator, the Future Value Calculator, or browse more Financial Calculators.
How this calculator works
The calculator multiplies the starting principal by the annual rate and the number of years to estimate total simple interest. It then adds that interest to the original principal to show the final value. Because simple interest does not compound, each year earns the same interest amount based on the starting principal only.
It also converts the total interest into a monthly, quarterly, or annual display figure so the result is easier to interpret. For deeper growth modeling, compare the output with the Present Value Calculator or the Annuity Payout Calculator.
Worked example
The default example uses a simple fixed-principal case that is useful for QA, for explaining the formula, and for comparing simple interest with compound growth.
Example inputs
Starting principal$50,000.00
Annual rate5.0%
Years10
Display frequencymonthly
Example result
In this example, a principal of $50,000.00 at 5.0% for 10 years produces total simple interest of $25,000.00 and a final value of $75,000.00. Broken into monthly terms, that equals about $208.33 per month.
Frequently asked questions
A simple interest calculator estimates how much interest you earn or owe when interest is calculated only on the original principal and not on previously earned interest.
Related financial tools
Continue from simple-interest planning into compounding, value growth, and payout comparisons with these related tools.
💰Compound Interest Calculator🔮Future Value Calculator💵Present Value Calculator💳Annuity Payout Calculator
If you are comparing a simple-interest scenario with more realistic reinvestment growth, continue into the Compound Interest Calculator, the Future Value Calculator, and the Present Value Calculator.
Explore This Tool in Context
Simple Interest Calculator is part of the Financial Calculators collection. If you want a broader view of similar workflows, open the Financial Calculators category page or browse all QuickTools categories.
Common next steps after this tool include Estate Tax Calculator, Social Security Calculator and Annuity Payout Calculator.
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