Grain to Pennyweight Conversion Calculator: Free Online Tool
Convert grains to pennyweights with our free online weight converter.
Grain to Pennyweight Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Grain).
- The converted value in Pennyweight will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Weight category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Grain to Pennyweight
Converting Grain to Pennyweight involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Grain = 0.0416667 pennyweightsExample Calculation:
Convert 5 grains: 5 × 0.0416667 = 0.208334 pennyweights
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Grain and a Pennyweight?
The grain (gr) is a unit of mass in the traditional English weight systems (Avoirdupois, Troy, and Apothecaries'). It was originally based on the weight of a single grain of barley. It is defined as exactly 64.79891 milligrams (or 1/7000 of an avoirdupois pound).
The pennyweight (dwt) is a unit of mass in the troy weight system. It is equal to 1/20 of a troy ounce, or 24 grains. It is equivalent to exactly 1.55517384 grams.
Note: The Grain is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Pennyweight belongs to the imperial/US customary system.
History of the Grain and Pennyweight
The grain is one of the oldest units of mass, dating back to antiquity, using seeds (like barley or wheat) as weight standards. It formed the legal basis for English weight systems and remains defined in terms of metric units today.
Historically, the pennyweight was the weight of a silver penny in medieval England. It became part of the standardized troy system used for precious metals and coinage.
Common Uses for grains and pennyweights
Explore the typical applications for both Grain (imperial/US) and Pennyweight (imperial/US) to understand their common contexts.
Common Uses for grains
- Ammunition: Measuring the mass of bullets and gunpowder charges.
- Archery: Measuring the mass of arrows and arrowheads.
- Medicine & Pharmacy: Historically used in the apothecaries' system; sometimes still used for measuring dosage of certain older medications (e.g., aspirin).
- Jewelry: Used in the troy system (24 grains = 1 pennyweight).
- Reloading: Handloading ammunition requires precise measurement in grains.
Common Uses for pennyweights
- Jewelry: Used by jewelers and goldsmiths for measuring quantities of precious metals during crafting and valuation.
- Dentistry: Sometimes used for measuring dental alloys.
- Ammunition: Historically used for specifying the weight of components in ammunition.
Frequently Asked Questions
Questions About Grain (gr)
How many grains are in an ounce (avoirdupois)?
There are 437.5 grains (gr) in 1 avoirdupois ounce (oz).
How many grains are in a pound (avoirdupois)?
There are 7,000 grains (gr) in 1 avoirdupois pound (lb).
How many milligrams are in a grain?
There are exactly 64.79891 milligrams (mg) in 1 grain (gr).
About Pennyweight (dwt)
How many pennyweights are in a troy ounce?
There are 20 pennyweights (dwt) in 1 troy ounce (oz t).
How many grains are in a pennyweight?
There are 24 grains (gr) in 1 pennyweight (dwt).
How many grams are in a pennyweight?
There are exactly 1.55517384 grams (g) in 1 pennyweight (dwt).
Conversion Table: Grain to Pennyweight
| Grain (gr) | Pennyweight (dwt) |
|---|---|
| 1 | 0.042 |
| 5 | 0.208 |
| 10 | 0.417 |
| 25 | 1.042 |
| 50 | 2.083 |
| 100 | 4.167 |
| 500 | 20.833 |
| 1,000 | 41.667 |
All Weight Conversions
Other Units from Weight
- Kilogram (kg)
- Gram (g)
- Milligram (mg)
- Pound (lb)
- Ounce (oz)
- Stone (st)
- Ton (metric) (t)
- Ton (US) (ton)
- Ton (UK) (long ton)
- Microgram (µg)
- Carat (ct)
- Slug (sl)
- Troy Ounce (oz t)
- Dram (dr)
- Quintal (q)
- Atomic Mass Unit (u)
- Pavan (India) (pavan)
- Kati (India) (kati)
- Masha (India) (masha)
- Dina (India) (dina)
- Pras (India) (pras)
- Lota (India) (lota)