Grams to Pennyweights Mass Converter
Common Conversions
| g | dwt |
|---|---|
| 0.1 | 0.064 |
| 0.5 | 0.322 |
| 1 | 0.643 |
| 2 | 1.286 |
| 5 | 3.215 |
| 10 | 6.43 |
| 25 | 16.075 |
| 50 | 32.151 |
| 100 | 64.301 |
| 1000 | 643.015 |
Why this conversion matters in chemistry
Consider dental high-noble alloy work. A 3.0 g crown of 75% Au alloy holds 2.25 g of gold metal, which lands at 1.45 dwt — on the patient alloy-content disclosure for insurance and crown-removal scrap accounting. The constant of 0.643015 dwt per gram comes from the troy ounce (31.1035 g) divided into 20 pennyweights. In practice you reach for it when a balance-side gram measurement of a precious-metal sample has to come out in the pennyweight units precious-metal trading and assay reports use.
Formula
dwt = g × 0.643015
Worked Examples
1.555 g = 1 dwt
One pennyweight in grams — the conversion anchor in reverse.
1 g = 0.643 dwt
The factor itself — a useful mental anchor for any precious-metal calculation.
31.103 g = 20 dwt
Exactly one troy ounce — the calibration anchor that anchors the entire troy-weight system.
Frequently Asked Questions
How do I convert grams to pennyweights?
Multiply by 0.643015, or equivalently divide by 1.55517. So 10 g becomes 6.43 dwt. The factor is exact through the troy-ounce definition.
How many pennyweights are in a troy ounce?
Exactly 20. The troy ounce divides into 20 pennyweights, and each pennyweight further divides into 24 grains. Both subdivisions sit in clean integer ratios with the troy ounce.
Is the pennyweight used in modern chemistry?
Rarely. It survives in precious-metal assay reports, mining geology, and the dental-alloy trade. Modern analytical chemistry stays in grams and milligrams; the pennyweight matters mainly when interpreting precious-metal documentation.