Student Loan & Repayment Plan Calculator
Estimate student loan monthly payments, grace-period interest capitalization, total interest and payoff time, with extra payments. All runs in your browser.
Your loan details
Interest accrues and capitalizes during grace
Applied 100% to principal
Results
Base payment
$341
Actual payment
$441
Total interest
$7,530
Interest saved
$3,347
Payoff time
86 months
34 months faster than scheduled
Total repayment
$37,530
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Balance & interest over time
Month-by-month breakdown
| Month | Payment | Principal | Interest | Balance |
|---|---|---|---|---|
| 1 | $441 | $278 | $163 | $29,722 |
| 2 | $441 | $280 | $161 | $29,442 |
| 3 | $441 | $281 | $159 | $29,161 |
| 4 | $441 | $283 | $158 | $28,878 |
| 5 | $441 | $284 | $156 | $28,594 |
| 6 | $441 | $286 | $155 | $28,308 |
| 7 | $441 | $287 | $153 | $28,021 |
| 8 | $441 | $289 | $152 | $27,732 |
| 9 | $441 | $290 | $150 | $27,442 |
| 10 | $441 | $292 | $149 | $27,150 |
| 11 | $441 | $294 | $147 | $26,856 |
| 12 | $441 | $295 | $145 | $26,561 |
| 13 | $441 | $297 | $144 | $26,264 |
| 14 | $441 | $298 | $142 | $25,966 |
| 15 | $441 | $300 | $141 | $25,666 |
| 16 | $441 | $302 | $139 | $25,364 |
| 17 | $441 | $303 | $137 | $25,061 |
| 18 | $441 | $305 | $136 | $24,756 |
| 19 | $441 | $307 | $134 | $24,450 |
| 20 | $441 | $308 | $132 | $24,141 |
| 21 | $441 | $310 | $131 | $23,831 |
| 22 | $441 | $312 | $129 | $23,520 |
| 23 | $441 | $313 | $127 | $23,207 |
| 24 | $441 | $315 | $126 | $22,892 |
| 25 | $441 | $317 | $124 | $22,575 |
| 26 | $441 | $318 | $122 | $22,257 |
| 27 | $441 | $320 | $121 | $21,937 |
| 28 | $441 | $322 | $119 | $21,615 |
| 29 | $441 | $324 | $117 | $21,291 |
| 30 | $441 | $325 | $115 | $20,966 |
| 31 | $441 | $327 | $114 | $20,639 |
| 32 | $441 | $329 | $112 | $20,310 |
| 33 | $441 | $331 | $110 | $19,979 |
| 34 | $441 | $332 | $108 | $19,647 |
| 35 | $441 | $334 | $106 | $19,313 |
| 36 | $441 | $336 | $105 | $18,977 |
| 37 | $441 | $338 | $103 | $18,639 |
| 38 | $441 | $340 | $101 | $18,299 |
| 39 | $441 | $342 | $99 | $17,958 |
| 40 | $441 | $343 | $97 | $17,614 |
| 41 | $441 | $345 | $95 | $17,269 |
| 42 | $441 | $347 | $94 | $16,922 |
| 43 | $441 | $349 | $92 | $16,573 |
| 44 | $441 | $351 | $90 | $16,222 |
| 45 | $441 | $353 | $88 | $15,869 |
| 46 | $441 | $355 | $86 | $15,515 |
| 47 | $441 | $357 | $84 | $15,158 |
| 48 | $441 | $359 | $82 | $14,799 |
| 49 | $441 | $360 | $80 | $14,439 |
| 50 | $441 | $362 | $78 | $14,077 |
| 51 | $441 | $364 | $76 | $13,712 |
| 52 | $441 | $366 | $74 | $13,346 |
| 53 | $441 | $368 | $72 | $12,977 |
| 54 | $441 | $370 | $70 | $12,607 |
| 55 | $441 | $372 | $68 | $12,235 |
| 56 | $441 | $374 | $66 | $11,860 |
| 57 | $441 | $376 | $64 | $11,484 |
| 58 | $441 | $378 | $62 | $11,106 |
| 59 | $441 | $380 | $60 | $10,725 |
| 60 | $441 | $383 | $58 | $10,342 |
| 61 | $441 | $385 | $56 | $9,958 |
| 62 | $441 | $387 | $54 | $9,571 |
| 63 | $441 | $389 | $52 | $9,182 |
| 64 | $441 | $391 | $50 | $8,791 |
| 65 | $441 | $393 | $48 | $8,398 |
| 66 | $441 | $395 | $45 | $8,003 |
| 67 | $441 | $397 | $43 | $7,606 |
| 68 | $441 | $399 | $41 | $7,207 |
| 69 | $441 | $402 | $39 | $6,805 |
| 70 | $441 | $404 | $37 | $6,401 |
| 71 | $441 | $406 | $35 | $5,995 |
| 72 | $441 | $408 | $32 | $5,587 |
| 73 | $441 | $410 | $30 | $5,177 |
| 74 | $441 | $413 | $28 | $4,764 |
| 75 | $441 | $415 | $26 | $4,349 |
| 76 | $441 | $417 | $24 | $3,932 |
| 77 | $441 | $419 | $21 | $3,513 |
| 78 | $441 | $422 | $19 | $3,091 |
| 79 | $441 | $424 | $17 | $2,667 |
| 80 | $441 | $426 | $14 | $2,241 |
| 81 | $441 | $429 | $12 | $1,813 |
| 82 | $441 | $431 | $10 | $1,382 |
| 83 | $441 | $433 | $7 | $949 |
| 84 | $441 | $436 | $5 | $513 |
| 85 | $441 | $438 | $3 | $75 |
| 86 | $76 | $75 | $0 | $0 |
Features
- Monthly payment estimate
- Grace-period interest capitalization
- Extra-payment savings (time & interest)
- Month-by-month repayment schedule
- Shareable result card + CSV export
Frequently asked questions
How the maths works
A student loan is a fixed-rate amortizing loan. A grace period lets interest accumulate and capitalize before payments start, so the balance you repay can exceed what you borrowed.
- 1During the grace period, monthly interest accrues on the balance and is capitalized (added to principal) when repayment begins.
- 2Base payment M = L·r / (1 − (1+r)^−n), where L is the capitalized balance, r the monthly rate and n the term in months.
- 3Each month, interest = balance·r and the rest of the payment reduces principal.
- 4An extra monthly payment goes 100% to principal, shortening the term and cutting total interest.
Figures are illustrative and exclude fees, deferment and forgiveness programs. Not financial advice.
Everything you need to know
What is interest capitalization?
During a grace period (typically six months after graduation), no payments are due but interest keeps accruing on unsubsidized loans.
When repayment starts, that accrued interest is added to your principal — you then pay interest on interest, which is why the balance can grow before you make a single payment.
Extra payments are the fastest lever
Every extra dollar you pay goes straight to principal, which cuts future interest and shortens the term — often by years.
The calculator shows exactly how many months (and how much interest) an extra monthly payment saves on your specific loan.
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