The problem
The shop shows you a total. It hides the split.
You ask the price of a bangle. The reply is a single figure — say ₹1,08,000. Whether that's fair depends entirely on numbers the shop didn't break out. Most online “gold calculators” make it worse: they fetch a live rate you can't check against the board in front of you, or they quietly fold making charges into the metal price.
How it comes apart
Rebuild the total from what you can see on the board.
Enter the gross weight, pick the hallmark purity, type the rate off the board, add the wastage and making the shop quoted, and the bill rebuilds itself line by line. Watch each layer stack up — and note the stamp on the right of every line.
- Metal value 10 g × 916 × rate ₹91,600 ◆ Fixed
- Wastage (VA) 8% of weight, at metal rate ₹7,328 ◇ Negotiable
- Making charges ₹550 / gram ₹5,500 ◇ Negotiable
- GST 3% composite on the value ₹3,132 ◆ Fixed
A worked example: 10 g at 22K 916, a 24K board rate of ₹10,000/g, 8% wastage, ₹550/g making, composite 3% GST.
The headline
Now colour it: which rupees can actually move?
Metal value and GST follow the rate and the law — they're fixed. Wastage and making charges are shop policy — they're negotiable. goldmath puts that one figure at the top of every quote.
The dashed edge on the negotiable side is an invitation: that's where the strike-through goes.
The honest number
It uses the stamp, not the fraction.
Under BIS standard IS 1417, hallmarked 22-carat gold is stamped 916 — a certified minimum of 91.6% purity. The tempting shortcut is 22 ÷ 24 = 91.667%. goldmath deliberately uses the stamped 916/1000, so the metal value is a slightly conservative, honest estimate rather than a rosy one. Every purity grade — 14K585 up to 24K995 — is cited to its source with the date it was verified.
Enforced, not promised
It can't leak what you're pricing — the browser blocks it.
runs in this browser
never reached
A strict Content-Security-Policy sets connect-src 'none'. That means the page
cannot make a network request even if it tried — no live rate is fetched, no
analytics fire, nothing about your bangle ever leaves the device. There are no external fonts,
scripts, or images either. Saved quotes live only in your browser's local storage.
What else it does
A short tour of the calculator.
-
Verify a bill
Type the total the shop wrote down and goldmath back-solves the implied making charge — the number to open your haggle with.
-
Buy-back / melt value
The honest ceiling on what the same ornament fetches on exchange — net weight × fineness × rate, with making, wastage and GST stripped out.
-
Compare two shops
Set Quote A and Quote B for the same ornament and see whose making + wastage is higher, and by exactly how much.
-
Two GST conventions
Composite 3% on the full value, or split 3% on goods + 5% on separately-billed making. The active assumption is always printed, never silent.
-
Save & print
Name and save quotes in your browser, copy a text summary, or print to PDF — no accounts, no cloud.
-
Cited constants
Every purity grade, GST rate and the tola conversion is shown with its source and verified-on date. The maths reads those numbers — it never duplicates them.
Now price the real thing.
Take the rate off the board, type it in, and see exactly which rupees you can push on. Free, offline, and it tells no one what you're buying.
Open the goldmath calculator →sreenivas-sadhu-prabhakara.github.io/goldmath