Convert Pennyweight to Exagram
Convert pennyweights to exagrams instantly. 1 pennyweight = 1.555174e-18 exagram — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Exagram 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.
Exagram
An exagram (Eg) equals 10^15 kilograms, or one quintillion grams.
From the SI prefix 'exa-' (from Greek 'hex', six, denoting the sixth power of 1000).
Confined to planetary- and atmospheric-scale mass discussions; never used in daily measurement.
The exa- prefix was adopted by the General Conference on Weights and Measures (CGPM) in 1975.
Pennyweight to Exagram conversion formula
The relationship between pennyweights and exagrams:
To convert pennyweights to exagrams, multiply the value in pennyweights by 1.555174e-18. To reverse, multiply exagrams by 6.430149e+17.
How to use this converter
Type a value into the calculator. The result in exagrams updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Exagram to Pennyweight converter for the reverse direction.
Step-by-step: convert pennyweights to exagrams
- Write down the value in pennyweights (dwt).
- Multiply that value by the factor 1.555174e-18.
- The product is the equivalent value in exagrams (Eg).
- To reverse, multiply the exagram value by 6.430149e+17.
Worked examples
Example 1 — Convert 1 dwt to Eg:
1 × 1.555174e-18 = 1.555174e-18 Eg
Example 2 — Convert 100 dwt to Eg:
100 × 1.555174e-18 = 1.555174e-16 Eg
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 exagrams daily when mixing metric and imperial tools.
10 dwt × 1.555174e-18 = 1.555174e-17 Eg
Real-world example — Postcard and small-object dimensions
A postcard is about 5 pennyweights wide. Converting to exagrams is essential for international postal addressing forms that ask for dimensions in different units across countries.
5 dwt × 1.555174e-18 = 7.775869e-18 Eg
Real-world example — Ruler-scale measurements
A 30-pennyweight school ruler converts cleanly to exagrams — useful when buying a desk accessory from a retailer whose product specs use a different unit.
30 dwt × 1.555174e-18 = 4.665521e-17 Eg
Pennyweight to Exagram conversion table
Standard reference values for converting pennyweights to exagrams:
| Pennyweight [dwt] | Exagram [Eg] |
|---|---|
| 0.01 | 1.555174e-20 |
| 0.1 | 1.555174e-19 |
| 1 | 1.555174e-18 |
| 2 | 3.110348e-18 |
| 3 | 4.665521e-18 |
| 4 | 6.220695e-18 |
| 5 | 7.775869e-18 |
| 10 | 1.555174e-17 |
| 20 | 3.110348e-17 |
| 30 | 4.665521e-17 |
| 40 | 6.220695e-17 |
| 50 | 7.775869e-17 |
| 100 | 1.555174e-16 |
| 500 | 7.775869e-16 |
| 1000 | 1.555174e-15 |
Frequently asked questions
How many exagrams is 1 pennyweight?
How do I convert pennyweights to exagrams?
How do I convert exagrams back to pennyweights?
How many exagrams is 100 pennyweights?
Popular weight unit conversions
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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-18 Eg) 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.