Ounce to Gram Gold Conversion: International Spot Price to Indian Rupee
Table of Contents
One troy ounce of gold is 31.1035 grams and that one number is the link between the price showing up on international tickers and the rate a jeweller quotes in India. Gold is priced in global markets in US dollars per troy ounce. Indian traders price it in rupees per gram. The ounce to gram gold conversion, divide the spot price by 31.1035, then multiply by the dollar-rupee exchange rate, translates one world into the other, with import duty and GST layered on before the retail figure appears. This guide gets the troy ounce right (not the 28-gram kitchen ounce, a confusion that throws off every calculation based on it), gives a quick conversion table, walks through a complete spot-to-INR example step by step, lists the factors that widen the gap between spot and shop, and shows why the math matters to anyone pledging gold for a loan.
How Many Grams Are in One Troy Ounce of Gold?
Exactly 31.1034768 grams, rounded in practice to 31.1035. Gold, silver, platinum and palladium all trade in troy ounces, an old unit the global bullion market never abandoned.
The common ounce is an entirely different thing. The avoirdupois ounce for food and parcels is 28.3495 grams, just under 3g lighter. Assuming "1 oz = 28 g" for gold is a very common conversion mistake. Feed that wrong figure into a price calculation and the answer lands about 9% off, enough to make a fair quote look like a rip-off or a bad one look fine. For gold, the ounce is always the troy ounce.
Troy Ounce vs Standard Ounce: Key Difference
|
Unit |
Grams |
Used for |
|
Troy ounce |
31.1035 |
Gold, silver, platinum, palladium |
|
Standard (avoirdupois) ounce |
28.3495 |
Food and everyday goods |
Note: Conversion values are standard measurement equivalents shown for reference.
Global gold price feeds use the troy ounce by default, and this convention applies across bullion markets worldwide.
Quick-Reference: Ounce to Gram Conversion Table
|
Troy Ounces |
Grams |
|
0.5 oz |
15.552 g |
|
1 oz |
31.1035 g |
|
2 oz |
62.207 g |
|
5 oz |
155.517 g |
|
10 oz |
311.035 g |
Note: Conversion values are standard measurement equivalents shown for reference.
The gram weight is fixed by physics; only the rupee price attached to it moves with the market.
How to Convert the International Spot Price to INR Per Gram
Three steps, one division and one multiplication:
- Note the international spot price in USD per troy ounce. As an illustration, take USD 4,000 per ounce; actual prices change by the second.
- Divide by 31.1035 to get the dollar price per gram: 4,000 ÷ 31.1035 = USD 128.60 per gram.
- Multiply by the prevailing dollar-rupee exchange rate. At an assumed rate of ₹96 to the dollar, purely for illustration: 128.60 × 96 = roughly ₹12,346 per gram.
That figure is the base landed equivalent, not the shop rate. Indian retail and lending rates build on it: gold import duty, standing at 15% as of May 2026, GST at 3% on purchases, and local demand-supply premiums all stack above the raw conversion. So the counter rate in India generally runs higher than the naked spot arithmetic, and the gap itself moves as duty and the rupee move.
Factors That Affect the Final INR Gold Rate
- The dollar-rupee exchange rate, which can move the INR price even on a flat spot day
- Import duty on gold, 15% as of May 2026
- GST at 3% on the purchase value
- Making charges, for jewellery, layered on top of the metal rate
Why This Conversion Matters for Gold Loan Borrowers
The rate a lender applies to pledged gold descends directly from this chain: international spot, converted to rupees per gram, feeding the domestic benchmarks. Under the RBI framework in force from 1 April 2026, lenders price pledged gold using published IBJA or SEBI-recognised exchange rates, taking the lower of the trailing 30-day average and the latest closing price, with the reference rate applied according to the assessed purity of the gold. A borrower who follows the spot-to-INR arithmetic can anticipate roughly where the valuation may land before visiting a branch. Net weight times purity times that benchmark rate, bounded by the tiered LTV caps, broadly frames the loan calculation. IIFL Finance publishes current gold rates on its website, and its branches assess pledged gold with the borrower present and provide an itemised assessment certificate, in line with applicable norms. Checking the day's rate beforehand can help set clear expectations for the visit.
Conclusion
One conversion constant and one exchange rate connect a London bullion quote to a per-gram price in an Indian branch: 31.1035 grams to the troy ounce, then dollars into rupees, then duty and tax into the retail layer. Get the ounce right, the troy ounce, not the kitchen one, and every downstream number behaves. For a household tracking the value of its gold, or sizing up a loan against it, the three-step arithmetic on this page is a genuinely usable tool: it turns a headline like "gold crosses 4,000 dollars" into an estimate of what the locker is worth today. The worked figures here are illustrations only; live rates, duty, and lender valuation under prevailing guidelines determine the final numbers, while a gold loan from IIFL Finance is assessed with reference to the applicable regulated benchmark on the day of valuation, subject to prevailing guidelines and lender policies.
Frequently Asked Questions
How many grams are in one troy ounce of gold?
31.1034768 grams, rounded to 31.1035 in everyday use. The troy ounce is the standard unit for all precious metals, and it is heavier than the avoirdupois ounce of 28.3495 grams used for ordinary goods. Mixing the two is a common error, and it distorts any price calculation by nearly 9%. Global spot quotes, futures contracts and bullion dealings assume the troy ounce without saying so. When converting any ounce-based gold figure to grams, multiplying by 31.1035 first, before touching prices, keeps the arithmetic honest.
How do I calculate the gold price per gram in rupees from the international spot price?
Divide the spot price in USD per troy ounce by 31.1035 and multiply by the current dollar-rupee exchange rate. For example, USD 4,000/31.1035= USD 128.60 per gram. Assuming the dollar to be around ₹96, that amounts to ₹ 12,346 per gram. The Indian retail rate then includes import duty (15% as of May 2026), 3% GST on purchase and any local premium, so shop quotes are usually above the raw conversion. Comparing that raw figure with published IBJA rates shows how much the layers add on a given day.
Why is gold measured in troy ounces and not grams?
Convention with centuries of momentum. The troy system, tracing to medieval European trade fairs, became the bullion market's standard, and the major global exchanges and the London market have priced precious metals in troy ounces ever since. Changing the world's benchmark unit would create more confusion than it would remove, so it persists. India, like most retail markets, quotes in grams for daily use, but the underlying benchmark that moves those gram rates is always set per troy ounce in dollars, which is why the conversion in this guide is worth keeping handy.
Does the karat purity of gold change its weight in grams per ounce?
No. Weight and purity are independent measurements. Whether it's 24K, 22K, or 18K, one troy ounce weighs 31.1035 grams. The karat tells you what fraction of that weight is pure gold, not the weight of the item. A troy ounce in 22K therefore weighs 31.1035 grams, of which around 28.5 grams will be pure gold. This is exactly why lenders and buyers price gold in two steps, weight first, purity second, and why an item's value per gram falls with karat even as the scale reads the same.
Disclaimer : The information in this blog is for general purposes only and may change without notice. It does not constitute legal, tax, or financial advice. Readers should seek professional guidance and make decisions at their own discretion. IIFL Finance is not liable for any reliance on this content. Read more
