Calculator
What the Prepayment Calculator does
Prepayment Calculator: calculates EMI Before, EMI After Prepay and EMI Reduction from Outstanding Principal, Interest Rate % p.a. and Remaining Tenure (years). Example: outstanding principal 2000000 ₹, interest rate % p.a. 8.5 and remaining tenure (years) 15 gives EMI before ₹19,694.79.
EMI Before, EMI After Prepay and EMI Reduction, derived from Outstanding Principal, Interest Rate % p.a., Remaining Tenure (years) and Lumpsum Prepayment. You can nudge a single number and watch the effect straight away.
Most people who open the Prepayment Calculator are savers modelling a goal. Getting the arithmetic right before you sign is cheaper than discovering it afterwards.
Your figures never leave the browser, which matters when the numbers are your salary, debts or savings.
If you want to check the arithmetic, the field table, the method and a worked example are further down.
What do the Prepayment Calculator fields mean?
The Prepayment Calculator uses 4 inputs. You do not have to fill everything in before seeing an answer; the starting values already produce one.
| Field | What to enter | Default |
|---|---|---|
| Outstanding Principal | measured in ₹; accepts 10000 to 100000000 | 2000000 |
| Interest Rate % p.a. | accepts 0.1 to 30 | 8.5 |
| Remaining Tenure (years) | accepts 1 to 40 | 15 |
| Lumpsum Prepayment | measured in ₹; accepts 0 to 100000000 | 200000 |
How does the Prepayment Calculator work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same calculation.
Values are checked first: an out-of-range or non-numeric entry names the offending field instead of returning nonsense.
Worked example
These are the values the Prepayment Calculator loads by default, and the result it produces from them. This is the worked example the page starts from, reproduced here so you can check the arithmetic.
| Outstanding Principal | 2000000 ₹ |
|---|---|
| Interest Rate % p.a. | 8.5 |
| Remaining Tenure (years) | 15 |
| Lumpsum Prepayment | 200000 ₹ |
| EMI Before | ₹19,694.79 |
|---|---|
| EMI After Prepay | ₹17,725.31 |
| EMI Reduction | ₹1,969.48 |
| Interest Saved | ₹1,54,506.24 |
| New Principal | ₹18,00,000.00 |
Read next: Loan Prepayment: How One Extra Payment Changes the Whole Schedule
How to use it
- Fill in Outstanding Principal in ₹ (10000 to 100000000).
- Type Interest Rate % p.a. (0.1 to 30).
- Enter Remaining Tenure (years) (1 to 40).
- Set Lumpsum Prepayment in ₹ (0 to 100000000).
- Watch the results panel as you type: it recalculates on every keystroke.
- The panel reports EMI Before, EMI After Prepay, EMI Reduction, Interest Saved and New Principal.
- Copy Link puts the current inputs in the URL, so bookmarking it brings the same numbers back.
What this tool does not do
- Fees, processing charges and taxes are not included unless there is a field for them.
- Lender rounding conventions differ, so your statement may vary by small amounts.
- Results are informational: check anything consequential against a second source.
- The tool cannot tell whether a number was entered in the unit you intended, so double-check the labels.
Frequently asked questions
Enter Outstanding Principal in ₹ and Lumpsum Prepayment in ₹. The unit is shown beside each box, and the result carries its own label, so there is nothing to convert by hand.
Outstanding Principal accepts 10000 to 100000000 ₹. If a value falls outside, the tool says which field is at fault instead of guessing.
With the values loaded when the page opens, EMI before comes out as ₹19,694.79. The figure is derived from the inputs above, so it updates whenever they do.
No. Your figures never leave the browser, which matters when the numbers are your salary, debts or savings.
No. There is no account, no usage cap and no trial period. The site is funded by advertising rather than by charging for the tools.
The result is reliable for the assumptions you entered, and those assumptions are the fragile part. A rate that changes mid-term will move the outcome more than any rounding here.