Convert Troy Ounce to Grain
Convert troy ounces to grains instantly. 1 troy ounce = 480.0000740753 grain — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Grain to Troy Ounce converter for the reverse conversion.
Units explained
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
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 to Grain conversion formula
The relationship between troy ounces and grains:
To convert troy ounces to grains, multiply the value in troy ounces by 480.0000740753. To reverse, multiply grains by 0.002083333.
How to use this converter
Type a value into the calculator. The result in grains updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Grain to Troy Ounce converter for the reverse direction.
Step-by-step: convert troy ounces to grains
- Write down the value in troy ounces (oz t).
- Multiply that value by the factor 480.0000740753.
- The product is the equivalent value in grains (gr).
- To reverse, multiply the grain value by 0.002083333.
Worked examples
Example 1 — Convert 1 oz t to gr:
1 × 480.0000740753 = 480.0000740753 gr
Example 2 — Convert 100 oz t to gr:
100 × 480.0000740753 = 48000.0074075332 gr
Real-world example — Adjacent metric sub-units
One troy ounce equals 1,000 grains. Engineers move between these scales constantly: PCB feature sizes in the larger unit, wire-bond diameters in the smaller.
1 oz t × 480.0000740753 = 480.0000740753 gr
Real-world example — Adjacent small-scale precision
One troy ounce equals 1,000 grains — the standard sub-millimeter precision conversion that materials engineers use whenever they switch between bulk material thickness specs (larger unit) and surface-finish characteristics (smaller unit).
1 oz t × 480.0000740753 = 480.0000740753 gr
Troy Ounce to Grain conversion table
Standard reference values for converting troy ounces to grains:
| Troy Ounce [oz t] | Grain [gr] |
|---|---|
| 0.01 | 4.8000007408 |
| 0.1 | 48.0000074075 |
| 1 | 480.0000740753 |
| 2 | 960.0001481507 |
| 3 | 1440.000222226 |
| 4 | 1920.0002963013 |
| 5 | 2400.0003703767 |
| 10 | 4800.0007407533 |
| 20 | 9600.0014815066 |
| 30 | 14400.0022222599 |
| 40 | 19200.0029630133 |
| 50 | 24000.0037037666 |
| 100 | 48000.0074075332 |
| 500 | 240000.0370376658 |
| 1000 | 480000.0740753316 |
Frequently asked questions
How many grains is 1 troy ounce?
How do I convert troy ounces to grains?
How do I convert grains back to troy ounces?
How many grains is 100 troy ounces?
Popular weight unit conversions
Convert Troy Ounce to other weight units
Show all Troy Ounce 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 oz t = 480.0000740753 gr) 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.