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Simple Interest Calculator
Quick answer
If principal is ₹1,00,000, annual rate is 7% and time is 5 years, the maturity amount is ₹1,35,000 and the interest is ₹35,000.
Simple interest formula: Interest = P × R × T ÷ 100; Maturity amount = P + Interest.
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%
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years
Maturity amount
₹1,35,000
What the investment is worth once its full term has run, including everything it has earned along the way.
26% is interest
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About the Simple Interest Calculator
Simple interest is charged only on the original amount — the interest does not earn interest. It is used for some short-term loans, certain deposits and bonds, and many school-level problems. Enter the principal, the annual rate and the time in years to see the interest and the maturity amount.
Compare the result with compound interest to see how much faster money grows when interest is added back.
Simple interest formula
Interest = P × R × T ÷ 100
Maturity amount = P + Interest
P is the principal, R the annual rate in percent and T the time in years.
Things to keep in mind
- Simple interest grows in a straight line, so doubling the time doubles the interest.
- Check whether a loan or deposit is quoted as simple or compound; the same rate gives different amounts.
- Convert months into years (months ÷ 12) before entering the time.
See how the result changes
Each table re-runs this calculator with one value changed and everything else left as it is.
Maturity amount by principal
If principal goes from ₹1,00,000 to ₹1,50,000, maturity amount changes from ₹1,35,000 to ₹2,02,500 (+50%).
| Principal | Maturity amount |
|---|---|
| ₹50,000 | ₹67,500 |
| ₹75,000 | ₹1,01,250 |
| ₹1,00,000start | ₹1,35,000 |
| ₹1,50,000 | ₹2,02,500 |
| ₹2,00,000 | ₹2,70,000 |
Maturity amount by annual rate
If annual rate goes from 7% to 10.5%, maturity amount changes from ₹1,35,000 to ₹1,52,500 (+13%).
| Annual rate | Maturity amount |
|---|---|
| 3.5% | ₹1,17,500 |
| 5.25% | ₹1,26,250 |
| 7%start | ₹1,35,000 |
| 10.5% | ₹1,52,500 |
| 14% | ₹1,70,000 |
Maturity amount by time
If time goes from 5 years to 7.5 years, maturity amount changes from ₹1,35,000 to ₹1,52,500 (+13%).
| Time | Maturity amount |
|---|---|
| 2.5 years | ₹1,17,500 |
| 3.75 years | ₹1,26,250 |
| 5 yearsstart | ₹1,35,000 |
| 7.5 years | ₹1,52,500 |
| 10 years | ₹1,70,000 |
FINANCE GUIDE
A quick guide to Simple Interest
Use it to get an accurate maturity amount in seconds — free, with no sign-up.
Instant results
See your maturity amount the moment you enter your numbers.
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Accurate & transparent
The same standard formula runs on our server for every calculation.
How to Use the Simple Interest Calculator
1
Enter Principal
Provide your principal.
2
Enter Annual rate
Provide your annual rate, in %.
3
Enter Time
Provide your time, in years.
4
View Your Results
Get your maturity amount instantly, calculated on our server.
What is Simple Interest?
This finance tool works out your maturity amount instantly, so you don't have to do the math by hand.
“One quick calculation, so you always know your maturity amount before you decide.”
What Affects Your Maturity amount
Your maturity amount depends on the values below.
Principal
Changing your principal changes your maturity amount.
Annual rate
Changing your annual rate changes your maturity amount. Typically between 0 and 50 %.
Time
Changing your time changes your maturity amount.
Example Result
Here's what you can expect from a simple interest calculation:
- Principal
- 100000
- Annual rate
- 7 %
- Time
- 5 years
- Maturity amount
- ₹1,35,000
- Interest
- ₹35,000
Frequently Asked Questions
- How does principal affect maturity amount?
- If principal goes from ₹1,00,000 to ₹1,50,000, maturity amount changes from ₹1,35,000 to ₹2,02,500 (+50%).
- How does annual rate affect maturity amount?
- If annual rate goes from 7% to 10.5%, maturity amount changes from ₹1,35,000 to ₹1,52,500 (+13%).
- How to calculate simple interest?
- Fill in principal, annual rate and time in the Simple Interest Calculator above and your maturity amount is calculated instantly. Change any value to see how the result responds.
- What does an example simple interest calculation look like?
- If principal is ₹1,00,000, annual rate is 7% and time is 5 years, the maturity amount is ₹1,35,000 and the interest is ₹35,000.
- Is this calculator free to use?
- Yes — every calculator on this site is completely free, with no sign-up or account required.
- How accurate is this calculator?
- It uses the standard formula and calculates on our server for every request, so results are precise for the values you enter.
- Is my data saved anywhere?
- No. Nothing you enter is stored or sent anywhere unless you choose to share a link with your values included.
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