Convert Grain to Metric Ton
Convert grains to metric tons instantly. 1 grain = 6.47989e-8 metric ton — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Metric Ton 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.
Metric Ton
The metric ton (t) equals exactly 1,000 kilograms; it is also called the tonne.
From 'tun', a large medieval cask; 'metric' distinguishes it from imperial tons.
The global standard for trade, freight, and heavy industry.
Recognized internationally with the spread of the metric system in the late 19th century.
Grain to Metric Ton conversion formula
The relationship between grains and metric tons:
To convert grains to metric tons, multiply the value in grains by 6.47989e-8. To reverse, multiply metric tons by 1.543236e+7.
How to use this converter
Type a value into the calculator. The result in metric tons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Metric Ton to Grain converter for the reverse direction.
Step-by-step: convert grains to metric tons
- Write down the value in grains (gr).
- Multiply that value by the factor 6.47989e-8.
- The product is the equivalent value in metric tons (t).
- To reverse, multiply the metric ton value by 1.543236e+7.
Worked examples
Example 1 — Convert 1 gr to t:
1 × 6.47989e-8 = 6.47989e-8 t
Example 2 — Convert 100 gr to t:
100 × 6.47989e-8 = 6.47989e-6 t
Real-world example — Fiber-optic link lengths
Converting from microscale grains to the metric tons of a long-haul fiber link is the conversion an optical engineer performs when calculating attenuation per kilometre of fiber.
1e+9 gr × 6.47989e-8 = 64.7989 t
Real-world example — Feature-scale to long-haul
One billion grains equals exactly one metric ton — the conversion an optical-network engineer performs when totalling feature-level path lengths into a single long-haul fiber-link distance.
1e+9 gr × 6.47989e-8 = 64.7989 t
Grain to Metric Ton conversion table
Standard reference values for converting grains to metric tons:
| Grain [gr] | Metric Ton [t] |
|---|---|
| 0.01 | 6.47989e-10 |
| 0.1 | 6.47989e-9 |
| 1 | 6.47989e-8 |
| 2 | 1.295978e-7 |
| 3 | 1.943967e-7 |
| 4 | 2.591956e-7 |
| 5 | 3.239945e-7 |
| 10 | 6.47989e-7 |
| 20 | 1.295978e-6 |
| 30 | 1.943967e-6 |
| 40 | 2.591956e-6 |
| 50 | 3.239945e-6 |
| 100 | 6.47989e-6 |
| 500 | 3.239945e-5 |
| 1000 | 6.47989e-5 |
Frequently asked questions
How many metric tons is 1 grain?
How do I convert grains to metric tons?
How do I convert metric tons back to grains?
How many metric tons 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 = 6.47989e-8 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 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.