Convert Pennyweight to Gigagram
Convert pennyweights to gigagrams instantly. 1 pennyweight = 1.555174e-9 gigagram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Gigagram to Pennyweight converter for the reverse conversion.
Units explained
Pennyweight
The pennyweight (dwt) equals one-twentieth of a troy ounce, 24 grains (about 1.555 g).
From the mass of a medieval English silver penny; symbol dwt from 'denarius weight'.
Jewelry making and precious-metal scrap valuation in the US.
Derived from the medieval English coinage system.
Gigagram
A gigagram (Gg) equals 10^6 kilograms, the same as 1,000 metric tons.
From the SI prefix 'giga-' (from Greek 'gigas', giant).
Bulk commodity, emissions, and freight accounting.
The giga- prefix entered the SI in 1960.
Pennyweight to Gigagram conversion formula
The relationship between pennyweights and gigagrams:
To convert pennyweights to gigagrams, multiply the value in pennyweights by 1.555174e-9. To reverse, multiply gigagrams by 6.430149e+8.
How to use this converter
Type a value into the calculator. The result in gigagrams updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Gigagram to Pennyweight converter for the reverse direction.
Step-by-step: convert pennyweights to gigagrams
- Write down the value in pennyweights (dwt).
- Multiply that value by the factor 1.555174e-9.
- The product is the equivalent value in gigagrams (Gg).
- To reverse, multiply the gigagram value by 6.430149e+8.
Worked examples
Example 1 — Convert 1 dwt to Gg:
1 × 1.555174e-9 = 1.555174e-9 Gg
Example 2 — Convert 100 dwt to Gg:
100 × 1.555174e-9 = 1.555174e-7 Gg
Real-world example — Postcard and small-object dimensions
A postcard is about 5 pennyweights wide. Converting to gigagrams is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 dwt × 1.555174e-9 = 7.775869e-9 Gg
Real-world example — Ruler-scale measurements
A 30-pennyweight school ruler converts cleanly to gigagrams — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 dwt × 1.555174e-9 = 4.665521e-8 Gg
Real-world example — Hardware-scale dimensions
A 10-pennyweight fastener or component is about as long as a thumbnail. Mechanics and DIY enthusiasts convert between pennyweights and gigagrams daily when mixing metric and imperial tools.
10 dwt × 1.555174e-9 = 1.555174e-8 Gg
Pennyweight to Gigagram conversion table
Standard reference values for converting pennyweights to gigagrams:
| Pennyweight [dwt] | Gigagram [Gg] |
|---|---|
| 0.01 | 1.555174e-11 |
| 0.1 | 1.555174e-10 |
| 1 | 1.555174e-9 |
| 2 | 3.110348e-9 |
| 3 | 4.665521e-9 |
| 4 | 6.220695e-9 |
| 5 | 7.775869e-9 |
| 10 | 1.555174e-8 |
| 20 | 3.110348e-8 |
| 30 | 4.665521e-8 |
| 40 | 6.220695e-8 |
| 50 | 7.775869e-8 |
| 100 | 1.555174e-7 |
| 500 | 7.775869e-7 |
| 1000 | 1.555174e-6 |
Frequently asked questions
How many gigagrams is 1 pennyweight?
How do I convert pennyweights to gigagrams?
How do I convert gigagrams back to pennyweights?
How many gigagrams is 100 pennyweights?
Popular weight unit conversions
Convert Pennyweight to other weight units
Show all Pennyweight conversions
Metric / SI (18 units)
Avoirdupois (15 units)
Troy & Apothecary (9 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 dwt = 1.555174e-9 Gg) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.