Convert Grain to Troy Ounce
Convert grains to troy ounces instantly. 1 grain = 0.002083333 troy ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Troy Ounce to Grain converter for the reverse conversion.
Units explained
Grain
The grain (gr) equals 1/7000 of an avoirdupois pound, about 64.8 milligrams.
Based on the nominal mass of a single barley grain.
Ammunition and bullet mass, archery, and historical pharmacy.
Standardized through the English avoirdupois system and retained in 1959.
Troy Ounce
The troy ounce (ozt) equals about 31.103 grams, one-twelfth of a troy pound.
From the Troy system of weights associated with Troyes, France.
The global standard for pricing gold, silver, platinum, and palladium.
Established in the medieval Troy system and retained for precious metals.
Grain to Troy Ounce conversion formula
The relationship between grains and troy ounces:
To convert grains to troy ounces, multiply the value in grains by 0.002083333. To reverse, multiply troy ounces by 480.0000740753.
How to use this converter
Type a value into the calculator. The result in troy ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Troy Ounce to Grain converter for the reverse direction.
Step-by-step: convert grains to troy ounces
- Write down the value in grains (gr).
- Multiply that value by the factor 0.002083333.
- The product is the equivalent value in troy ounces (oz t).
- To reverse, multiply the troy ounce value by 480.0000740753.
Worked examples
Example 1 — Convert 1 gr to oz t:
1 × 0.002083333 = 0.002083333 oz t
Example 2 — Convert 100 gr to oz t:
100 × 0.002083333 = 0.2083333012 oz t
Real-world example — Packaging gauge
A 4-grain plastic bag thickness is a common spec for grocery and freezer bags. Converting from grains to troy ounces is what packaging buyers do whenever they bridge US and metric supplier quotes.
4 gr × 0.002083333 = 0.008333332 oz t
Real-world example — Plastic film and laminate thickness
A 500-grain sheet is a typical spec for ID-card laminates and film overlays. Converting to troy ounces aligns the value with the unit most CAD systems and material datasheets prefer.
500 gr × 0.002083333 = 1.0416665059 oz t
Grain to Troy Ounce conversion table
Standard reference values for converting grains to troy ounces:
| Grain [gr] | Troy Ounce [oz t] |
|---|---|
| 0.01 | 2.083333e-5 |
| 0.1 | 0.0002083333 |
| 1 | 0.002083333 |
| 2 | 0.004166666 |
| 3 | 0.006249999 |
| 4 | 0.008333332 |
| 5 | 0.0104166651 |
| 10 | 0.0208333301 |
| 20 | 0.0416666602 |
| 30 | 0.0624999904 |
| 40 | 0.0833333205 |
| 50 | 0.1041666506 |
| 100 | 0.2083333012 |
| 500 | 1.0416665059 |
| 1000 | 2.0833330118 |
Frequently asked questions
How many troy ounces is 1 grain?
How do I convert grains to troy ounces?
How do I convert troy ounces back to grains?
How many troy ounces is 100 grains?
Popular weight unit conversions
Convert Grain to other weight units
Show all Grain conversions
Metric / SI (18 units)
Avoirdupois (14 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 gr = 0.002083333 oz t) 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 Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.