How to Calculate Girvi Interest: A Simple Guide for Jewellers

If you lend money against gold, calculating interest correctly is the heart of your Girvi business. Get it right and you earn steadily and fairly. Get it wrong, even by a little, and you either lose money or end up in a dispute with a customer.

Most jewellers learned Girvi interest from their father or by habit. That works until the loan book grows, part-payments come in, and the numbers get messy. This guide explains exactly how Girvi interest is calculated, in the simplest way, with real examples.

The Two Ways to Calculate Girvi Interest

There are two common methods. Most jewellers use the first one.

1. Flat Rate Method (most common)

Here, interest is charged on the full loan amount for the whole time, no matter how much the customer has paid back. This is the method most private lenders and jewellers use.

Formula: Interest = Principal × Monthly Rate × Number of Months

Example: A customer takes ₹10,000 at 2% per month for 6 months.
Interest = 10,000 × 2% × 6 = ₹1,200
Total to repay = 10,000 + 1,200 = ₹11,200

Simple and clear. This is why most shops prefer it.

2. Reducing Balance Method

Here, interest is charged only on the amount still owed. As the customer pays back, the interest reduces. This is fairer to the customer, but harder to calculate by hand, especially with part-payments.

Example: On the same ₹10,000 at 2% per month, if the customer pays back ₹5,000 after 3 months, the next 3 months' interest is charged only on the remaining ₹5,000, not the full amount.

The catch: doing this by hand across many loans and many part-payments is where mistakes and arguments begin.

A Common Point of Confusion: Monthly vs Yearly Rate

This trips up many people. Girvi rates are almost always quoted per month, not per year.

So "2%" in Girvi usually means 2% per month, which is 24% per year. Banks quote yearly rates, private lenders quote monthly. Always be clear which one you mean, because mixing them up changes the number massively.

Girvi Interest at a Glance: Ready Examples

Instead of doing the math each time, here are common Girvi calculations using the flat rate method (2% per month is the most common rate). Just find the row close to your loan.

To work out any amount yourself: Interest = Loan × (Rate ÷ 100) × Months.

This table is handy for quick checks. But for a full loan book, with dozens of customers, part-payments and due dates, doing this by hand for each one is where mistakes start. That is where Girvi software comes in.

Why Manual Calculation Becomes a Problem

One or two loans are easy. A growing Girvi book is not. Here is where it goes wrong by hand:

Human errors in multiplication. One wrong figure across many loans quietly eats your profit.

Part-payments get confusing. When a customer pays partially, recalculating the remaining interest by hand is slow and error-prone.

Due dates get missed. Without reminders, overdue loans sit uncollected, and you lose interest you were owed.

Disputes happen. If your number and the customer's number do not match, and you have no clear record, you risk the relationship.

Our guide on why you need a Girvi management software covers these problems in more detail.

How Girvi Software Does the Math for You

Good jewellery software with a Girvi module handles all of this automatically.

Pick your method. Set flat rate or reducing balance once, and every loan uses it correctly.

Interest calculates itself. Enter the loan and rate, and the software works out interest for any date instantly, even with part-payments.

Every payment is recorded. Part-payments, top-ups and closures are logged, and the balance updates on its own.

Due-date reminders. The system flags overdue loans so you collect on time.

A clear record for every customer. No disputes, because both sides can see exactly what was borrowed, paid and owed.

GehnaERP offers a dedicated Girvi product that does exactly this: KYC, simple and compound interest, top-ups, bank transfers and automatic reminders. To understand the full picture, read our Girvi software for jewellers guide.

The Bottom Line

Girvi interest is not complicated once you know the method. Flat rate for most, reducing balance for those who prefer it, and always be clear whether a rate is monthly or yearly.

The calculation is easy for one loan. The real challenge is doing it correctly across a whole loan book, month after month, without errors or disputes. A reference table helps for quick checks. Software handles the whole business.

Want your entire Girvi book calculated automatically, with zero errors? Start a free 30-day GehnaERP trial with a personal onboarding call. You can also call or WhatsApp us at 9424816631 to see the Girvi module in action.

FAQ

Q: How is Girvi interest calculated?
Most jewellers use the flat rate method: Interest = Principal × Monthly Rate × Number of Months. For example, ₹10,000 at 2% per month for 6 months gives ₹1,200 interest. Some use the reducing balance method, where interest is charged only on the amount still owed.

Q: Is Girvi interest monthly or yearly?
Girvi rates are almost always quoted per month. So 2% usually means 2% per month, which is 24% per year. Always confirm whether a rate is monthly or yearly before calculating.

Q: What is the difference between flat rate and reducing balance?
Flat rate charges interest on the full loan amount for the whole period. Reducing balance charges interest only on the remaining amount after each payment, which is fairer to the customer but harder to calculate by hand.

Q: How can I calculate interest for many loans easily?
A reference table works for one loan, but for a full loan book with part-payments and due dates, Girvi software like GehnaERP calculates interest automatically for every customer, with reminders and clear records.