How to use
- 1Enter capital, rate and period.
- 2See the interest and final amount.
About
Calculates simple interest with the classic formula, ideal for short-term loans and investments.
How to calculate simple interest
UtilNexo's simple interest calculator shows the final amount (total) of a capital when interest applies only to the initial capital.
The total amount formula is M = C × (1 + i × t), where C is capital, i is the rate, and t is time. If you invest $1,000 at 1% per month for 3 months, the final amount is 1,000 × (1 + 0.01 × 3) = $1,030 — the value the tool displays.
Unlike compound interest, here interest does not accumulate on interest. It is common in short-term operations and some types of loans and financing.
Examples
- 1000; 1; 3 → 1030.00.
- 500; 2; 5 → 550.00.
Limitations
- The rate and time must be in the same unit (for example, % per month and months).
- The result is a mathematical calculation; it does not include fees, taxes, or additional costs of the financial product.
How to use the simple interest calculator
- 1Enter the initial capital.
- 2Type the interest rate and the period.
- 3See the interest and the amount.
Frequently asked questions
What is the difference between simple and compound interest?
With simple interest, interest applies only to the initial capital; with compound, it also applies to accumulated interest.
How do I convert the rate to the same unit as time?
If the period is in months, use the monthly rate; if in years, the annual rate. The tool guides the input.
Where is simple interest used?
In short-term loans, discounting of securities, and some advance operations.
Other tools
Percentage Calculator
Calculate percentages easily.
Rule of Three Calculator
Work out the missing proportional value from three known values.
Discount Calculator
Calculate discounted value.
Percentage Increase Calculator
Calculate percentage increase.
Compound Interest Calculator
Calculate compound interest.
Profit Margin Calculator
Find the margin on the selling price from your cost and final price.