Gold Price Pennyweight Calculator

gold pennyweight calculator: estimate melt value, purity, and spot-based gold worth with clear shop-floor examples.

Walk a scrap ticket in a lot of U.S. shops and you'll still see DWT — pennyweight — not grams. Sellers who only think in grams convert under pressure and drop digits.

Buyers quote "fourteen at X a DWT" and expect you to keep up. Miss the unit and you nod at the wrong dollars.

This calculator keeps gold math in pennyweight so the ticket language matches the scale language.

What a pennyweight is (no folklore)

1 DWT = 1/20 troy ounce ≈ 1.55517 g
20 DWT = 1 troy ounce

It's a troy family unit. It is not a "penny's weight" on a kitchen scale. Full unit map: pennyweight vs grams vs troy ounce.

If your scale shows grams, convert once: grams ÷ 1.55517 ≈ DWT — then stay in DWT until the quote is done.

DWT value without mixing units

Pure DWT price = gold spot per troy oz ÷ 20.
Alloy DWT price = pure DWT price × purity (karat/24).

Example structure: at spot S $/troy oz, pure ≈ S/20 per DWT.
14K DWT ≈ (S/20) × 0.583.

Enter lot DWT × alloy rate for melt-style value. Or enter DWT × purity × (S/20).

Karat rates per DWT (EXAMPLE spot)

EXAMPLE spot: $4,000 / troy oz (illustrative) → pure = $200 / DWT.

Karat	Purity	≈ $/DWT at EXAMPLE spot
10K	0.417	$83.40
14K	0.583	$116.60
18K	0.750	$150.00
22K	0.917	$183.40
24K	0.999	$199.80

Replace the EXAMPLE spot with live numbers in the tool. Linear scaling still holds: double the DWT, double the melt-style dollars at the same rate.

EXAMPLE — 12 DWT of 14K scrap

EXAMPLE pure DWT = $200; 14K ≈ $116.60 / DWT.

Lot: 12 DWT confirmed 14K, stones out.

Melt-style ≈ 12 × 116.60 ≈ $1,399.

Same metal in grams: 12 × 1.55517 ≈ 18.66 g. Run grams with a per-gram rate and you should land within rounding of the same dollars. If you don't, a unit got sideways.

Ticket habits that keep you honest

Write the unit next to every number: 12.4 DWT not just 12.4.

Ask whether the posted karat rate is per DWT of jewelry or per DWT of fine gold. Counters blur that sentence constantly.

Sorted lots only. Averaging 10K and 18K into one DWT rate is how both sides argue later. Sort guidance pairs well with the scrap gold calculator.

gold pennyweight calculator gold value tips — Visual guide supporting gold pennyweight calculator — weight, karat, and melt-style estimates.

Related tools and guides

Frequently Asked Questions

How many grams in a pennyweight?

About 1.55517 g.

How many DWT in a troy ounce?

Exactly 20.

Is DWT still used?

Yes — especially on scrap and pawn tickets in parts of the U.S.

Can I convert DWT to troy ounces quickly?

Divide DWT by 20. 50 DWT = 2.5 troy oz.

Why doesn't my gram calculator match the DWT ticket?

Usually a purity mismatch or an avoirdupois/troy mix-up. Recheck unit and karat.

Does under-plumb change DWT math?

It changes effective purity, not the unit. See half karat under plumb.

Disclaimer

DWT estimates follow the weight and purity you enter. Settlement follows assay and buyer terms. Educational use only.