Late Fee Calculator
Work out what a student owes when a fee is paid after the due date — using your institute’s exact late-fee rule.
- 100% free
- No sign-up required
- Instant results
- Math steps shown
- Chargeable days = 12 − 3 = 9
- Late fee = ₹50 × 9 = ₹450
- Amount payable = ₹25,000 + ₹450 = ₹25,450
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How late fees are calculated
Each block explains one part of how this works and how to read the result.
Three common institutional rules
Flat: a single penalty once the grace period ends. Per-day: penalty × chargeable days. Monthly %: fee × (monthly rate ÷ 100) × (chargeable days ÷ 30). Chargeable days = days late − grace days (floored at zero).
Always follow the fee circular your institution issued for the academic year — this tool applies the arithmetic of the rule you enter, not a statutory late-fee schedule.
Frequently asked questions
What is a grace period?
Days after the due date during which no late fee is charged. If days late ≤ grace, late fee is zero.
Can late fee exceed the original fee?
Under a high per-day or % rule it can. Cap it manually if your policy has a maximum penalty.
Is GST charged on late fees?
For commercial coaching, ask your accountant — treatment can follow the underlying supply. Schools with exempt education may differ.
Does this send reminders?
No — it only computes amounts. Knwdle Fee Management can automate reminders and receipts.
Related fee & finance calculators
More free calculators and formats in the same lane.
For developers & AI agents
The Late Fee Calculator is also available as a free, unauthenticated JSON API — no API key, no sign-up, CORS enabled for all origins. Send a GET request with the parameters below and receive the computed result as JSON, including the source of the format or formula used. Invalid input returns HTTP 400 with a JSON { "error": "..." } body.
GET https://knwdle.com/api/tools/late-fee-calculator| Parameter | Required | Description |
|---|---|---|
feeAmount | Yes | Original fee in INR |
daysLate | Yes | Calendar days after due date |
graceDays | No | Grace days (default 0) |
mode | Yes | flat | perDay | percentPerMonth |
flatLateFee | No | Required when mode=flat |
perDayFee | No | Required when mode=perDay |
percentPerMonth | No | Required when mode=percentPerMonth |
Request:
GET https://knwdle.com/api/tools/late-fee-calculator?feeAmount=25000&daysLate=12&graceDays=3&mode=perDay&perDayFee=50
Response:
{
"tool": "late-fee-calculator",
"input": {
"feeAmount": "25000",
"daysLate": "12",
"graceDays": "3",
"mode": "perDay",
"perDayFee": "50",
"flatLateFee": "500",
"percentPerMonth": "1.5"
},
"result": {
"primaryLabel": "Late fee due",
"primaryValue": "₹450",
"steps": [
"Chargeable days = 12 − 3 = 9",
"Late fee = ₹50 × 9 = ₹450",
"Amount payable = ₹25,000 + ₹450 = ₹25,450"
],
"extras": [
{
"label": "Original fee",
"value": "₹25,000"
},
{
"label": "Total with late fee",
"value": "₹25,450"
}
],
"tables": [],
"listSections": []
},
"formula": "Late fee = f(days late − grace) under flat / per-day / %×(days/30) institutional rules.",
"source": "Late fee = f(days late − grace) under flat / per-day / %×(days/30) institutional rules."
}
Collect fees without spreadsheet math
Knwdle automates fee invoices, reminders, and receipts for schools, colleges, and coaching institutes.
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