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.
हर व्यापार का डिजिटल सहायक
Sahayo builds simple, dependable software for credit societies, vyaparis, jewellers, clinics, shops and schools — offline-first, in Hindi and English, with your data always in your hands.
| 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 |
Pick the helper made for your work — or combine them. They share the same proven interest engine, design and support.
Complete core-banking software for credit cooperative societies and pat sansthas — members, deposits, loans, daily collection, interest and statutory reports.
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.
A fast, no-fuss interest calculator for the counter — enter amount, dates and ROI, add as many loans as you like and print the total in Hindi or English.
Girvi (pledge) management for jewellers and pawn brokers — items with weight and purity, photos, interest due, release and overdue alerts.
A tablet app for homeopathy doctors — handwritten case notes with a stylus, prescriptions, symptom photos, old paper files, appointments and WhatsApp reminders.
Simple accounting for Indian shops with true Hindi typing — type in English, pick the Hindi word. Parties, places, customers and books of accounts.
Fee collection, dues, receipts, expenses and salary accounts for private schools — with class-wise dues and clear reports for the management.
No clutter, no jargon. Just the screens you need, laid out the way you already think about your business.
Deposits, loans, members and NPA for the whole society on one screen — with monthly collection trends and the deposit mix.
| Voucher | Member | Account | Amount | Mode |
|---|---|---|---|---|
| R-2026-04812 | Ramesh C. Patel | RD-0384 | ₹2,000 | Cash |
| P-2026-01177 | Sunita Joshi | FD-0921 | ₹1,25,000 | Bank |
| R-2026-04813 | Mohanlal Verma | LN-0156 EMI | ₹8,450 | Cash |
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 |
Add rows for every loan of a customer. Mark the ones you want and get total principal, interest and amount instantly.
| # | Loan Date | Received | Loan Amount | Days | ROI | Interest | Total | ID | ✓ |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 12-01-2026 | 13-04-2026 | 50,000 | 92 | 2.00 | 3,067 | 53,067 | C-104 | ☑ |
| 2 | 05-11-2025 | 13-04-2026 | 1,00,000 | 160 | 1.50 | 8,000 | 1,08,000 | C-117 | ☑ |
| 3 | 20-02-2026 | 13-04-2026 | 25,000 | 53 | 2.50 | 1,104 | 26,104 | C-218 | ☑ |
Customer, item, purity, gross and net weight, photos, loan amount and ROI — and a printed slip for the customer.
Write naturally on the tablet like on paper. Handwriting, prescriptions and photos stay inside the patient file.
| Date | Remedy | Follow-up |
|---|---|---|
| 02-10-2026 | Nat Mur 30 | 2 wk |
| 11-09-2026 | Sac Lac | 3 wk |
Type “ramesh kirana” and pick “रमेश किराना” from the suggestions. Party, place and customer masters all support Hindi.
| Party | Place | Type | Balance |
|---|---|---|---|
| शर्मा ट्रेडर्स | देवास | Supplier | ₹48,200 Cr |
| महावीर ऑयल मिल | उज्जैन | Supplier | ₹1,12,000 Cr |
| राधे श्याम स्टोर | सांवेर | Customer | ₹9,750 Dr |
Collected fees, pending dues and expenses for the session — with class-wise dues so follow-up is easy.
| Class | Due |
|---|---|
| Nursery–KG | ₹0.8 L |
| I–V | ₹2.1 L |
| VI–VIII | ₹1.9 L |
| IX–XII | ₹1.4 L |
Most software is designed somewhere else and adapted for India. Sahayo starts here — with the methods, languages and conditions of Indian business.
Every Sahayo helper runs on your own computer or tablet. Power cut at the tower? Your work carries on.
Records live in a file on your device — not on our servers. You decide where copies go.
Hindi typing, Hindi prints and Hindi names where it matters. Software that speaks your customer’s language.
Byaj per ₹100 per month, inclusive day counts, yearly compounding, FD/RD, NPA — the way it is really done here.
Receipts, ledgers, slips and reports that look professional on any printer, or as a PDF on WhatsApp.
Built-in backup — encrypted where it matters — so a broken computer is an inconvenience, not a disaster.
Clean screens, keyboard-friendly entry and instant search. Learnt in an afternoon, not a month.
A licence per device, with sample data to try first. If a licence lapses you can still view and print your records.
We help with setup, data migration from Excel and training — in Hindi or English.
Tell us about your work. We show you the product with sample data that looks like your business.
We help you install, licence the device and import your existing records from Excel.
Use it every day, print what you need and keep regular backups. We are here when you need help.
Practical articles on interest, cooperative banking, record keeping and going digital.
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.
Two ways of counting days give two different interest figures. Learn how the calendar method and the 30-day (360-day year) method work, with examples and when to use each.
What should software for a credit cooperative society or pat sanstha do? A checklist covering members, deposits, loans, daily collection, interest, NPA, reports, backup and migration.
Sahayo (pronounced Sa-ha-yo, from सहायक — “helper”) is your smart business helper: a family of focused software products for Indian businesses: Society e-Banking, Vyapari Khatabook, Loan Calculator, Girvi Hisaab, Homeo Clinic, Accounting and School Accounting. Each one does one job really well.
No. They are offline-first and run on your own Windows computer or Android tablet. Internet is only needed for optional things like sending a WhatsApp reminder or copying a backup to your cloud drive.
Yes. Book a free demo through the contact form. Most products also include sample data so you can explore every screen before entering your own records.
Yes. Several products import from Excel — members, accounts, loans or patients — and our team helps with the first migration.
Yes. Loan Calculator prints in Hindi or English, Accounting has built-in Hindi typing (type in English, pick the Hindi word), and names and places can be stored in Hindi.
Use the contact form and choose the products you are interested in. We will share pricing suited to the size of your business.
Book a free, no-obligation demo. We will set it up with sample entries from your business so you can judge it properly.