How to Calculate Byaj (Interest) at “₹ per 100 per Month” — With Examples
A simple guide to calculating interest the traditional Indian way — rate per ₹100 per month, counting days, yearly compounding and part payments — with worked examples.
Vyapari Khatabook keeps every party’s loans, payments and interest in one place. Open a party and see the exact amount due today — calculated the way your bahi does it, per ₹100 per month with yearly compounding.
| Party | City / Village | Loans | Principal | Interest | Total due |
|---|---|---|---|---|---|
| Ramprasad Patidar | Sanwer | 3 | ₹4,50,000 | ₹35,422 | ₹4,85,422 |
| Shyam Kirana Store | Dewas | 1 | ₹1,20,000 | ₹9,880 | ₹1,29,880 |
| Bhagwan Singh | Betma | 2 | ₹2,75,000 | ₹38,415 | ₹3,13,415 |
| Maa Durga Textiles | Indore | 4 | ₹6,00,000 | ₹44,900 | ₹6,44,900 |
| Kamla Devi | Depalpur | 1 | ₹60,000 | ₹7,230 | ₹67,230 |
The digital bahi-khata for traders who lend and borrow money on interest — party-wise loans, interest up to today, multi-loan receipts and clear ledgers.
Every party with name, city or village and contact details — searchable in a second.
Give multiple loans to the same party, each with its own date, amount and ROI — just like separate entries in your bahi.
ROI per ₹100 per month, day count including both dates, and interest compounded yearly — exactly like the Loan Calculator.
Choose actual calendar days or the 30-day-month (360-day year) convention to match how you have always calculated.
Receive one amount and apply it across several loans. Interest is settled first, then principal — automatically.
Every payment gets a clean receipt you can print or save as PDF and share with the party.
Date-wise ledger with given, received, ROI, days and interest — plus a full party loan book.
Track money you have borrowed, sorted by interest rate, so you know which loan costs you the most.
Cash and bank accounts, loan report and other reports for a clear picture of your money.
See every party you have lent to with principal, interest up to today and total due — sorted, searchable and ready to act on.
| Party | City / Village | Loans | Principal | Interest | Total due |
|---|---|---|---|---|---|
| Ramprasad Patidar | Sanwer | 3 | ₹4,50,000 | ₹35,422 | ₹4,85,422 |
| Shyam Kirana Store | Dewas | 1 | ₹1,20,000 | ₹9,880 | ₹1,29,880 |
| Bhagwan Singh | Betma | 2 | ₹2,75,000 | ₹38,415 | ₹3,13,415 |
| Maa Durga Textiles | Indore | 4 | ₹6,00,000 | ₹44,900 | ₹6,44,900 |
| Kamla Devi | Depalpur | 1 | ₹60,000 | ₹7,230 | ₹67,230 |
Each loan with its own ROI and days. Yearly compounding is applied automatically, so the figure matches your bahi.
| Date | Particulars | Given | Received | ROI | Days | Interest |
|---|---|---|---|---|---|---|
| 15-01-2025 | Loan #1 given (cash) | ₹2,00,000 | 1.25 | 648 | ₹57,587 | |
| 02-06-2025 | Loan #2 given (bank) | ₹1,50,000 | 1.50 | 510 | ₹40,235 | |
| 20-12-2025 | Received — Loan #1 interest | ₹30,000 | ||||
| 11-03-2026 | Loan #3 given (cash) | ₹1,00,000 | 1.00 | 228 | ₹7,600 | |
| 18-08-2026 | Received — Loans #1 & #2 | ₹40,000 | ||||
| Outstanding today | ₹4,50,000 | ₹70,000 | ₹1,05,422 |
Receive a single amount and split it across multiple loans, interest first. Print or save the receipt as PDF.
| Loan | Interest paid | Principal paid | Balance |
|---|---|---|---|
| Loan #1 · 15-01-2025 | ₹21,800 | ₹0 | ₹2,00,000 |
| Loan #2 · 02-06-2025 | ₹18,200 | ₹0 | ₹1,50,000 |
Track money you have borrowed too — sorted by rate, so you always know which loan to repay first.
| Lender | Since | Amount | ROI / ₹100 / month | Interest to date |
|---|---|---|---|---|
| Jain Finance | 04-02-2026 | ₹3,00,000 | 2.00 | ₹52,000 |
| Mehta Brothers | 19-09-2025 | ₹5,00,000 | 1.50 | ₹99,750 |
| Cooperative Bank OD | 01-04-2026 | ₹8,00,000 | 0.92 | ₹51,520 |
| Total | ₹16,00,000 | ₹2,03,270 |
With dozens of parties and loans at different rates, working out what is due takes hours — and one wrong day count changes the answer. Vyapari Khatabook calculates every loan’s interest up to today with no intermediate rounding, so the figure is exact and repeatable.
A party rarely pays loan by loan. They bring one amount. Record it once and let the software distribute it across their loans — interest first, then principal — and print a receipt that shows exactly where every rupee went.
Enter parties with their city or village. Load sample data first if you want to try it out.
Record each loan with date and ROI, and choose calendar days or the 30-day convention.
Record payments, print receipts and open any party to see what is due today.
Interest = principal × ROI% × days ÷ 30, where ROI is per ₹100 per month. Both the loan date and the receive date are counted, and unpaid interest is added to the principal every 12 months (yearly compounding). Only the final figure is rounded.
Yes. In Loan / Interest Settings you can choose actual calendar days or the 30-day-month convention, where every month counts as 30 days and a year as 360 days.
The payment is applied to interest first and the rest to principal. Any interest left unpaid stays pending and is compounded at the next yearly boundary — the same way it is done in a traditional bahi.
Yes. The “Loans Taken (By ROI)” report tracks money you have borrowed and sorts it by interest rate.
Your data stays in a database file on your own computer. Nothing is uploaded anywhere unless you choose to copy a backup.
A simple guide to calculating interest the traditional Indian way — rate per ₹100 per month, counting days, yearly compounding and part payments — with worked examples.
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Book a free demo. We will set it up with entries that look like your business, so you can judge it properly.