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Weight

Convert grains to metric tons

1 gr=6.4799e-8t

Use the converter below to change any grains value into metric tons instantly — with formula, conversion table, and real-world examples.

6.4799e-8

Conversion formula

Forward
metric tons = grains × 6.4799e-8
Reverse
grains = metric tons × 15,432,358.35

Example: 10 gr × 6.4799e-8 = 6.4799e-7 t.

About both units

From

Grain

gr

The grain equals 64.79891 milligrams exactly, one of the oldest units of mass. Originally defined as the weight of a single grain of barley. Today used almost exclusively in firearms (bullet and gunpowder weights) and pharmaceuticals.

Real-world: A 9 mm bullet typically weighs 115–124 grains (7.45–8.03 g). Aspirin grain dosing: "5 grain aspirin" = 325 mg.
Read full grain reference →
To

Metric Ton

t

The metric ton (also "tonne" in British English) equals 1000 kilograms exactly. It is the standard tonnage unit in international shipping, agriculture and industrial production. Do not confuse it with the US short ton (907 kg) or the British long ton (1016 kg).

Real-world: A mid-size car weighs about 1.5 t. A 20-ft shipping container holds up to 28 t. Global steel output is about 1,900 million tonnes per year.
Read full metric ton reference →

Grain to Metric Ton conversion table

Common grains to metric tons values for quick reference.

Grain (gr)Metric Ton (t)
1 gr6.4799e-8 t
5 gr3.2399e-7 t
10 gr6.4799e-7 t
25 gr1.6200e-6 t
50 gr3.2399e-6 t
100 gr6.4799e-6 t
250 gr1.6200e-5 t
500 gr3.2399e-5 t
1,000 gr6.4799e-5 t
5,000 gr0.000324 t

Tips & common mistakes

Quick tips

  • 1 grain = 64.79891 mg exactly. 7000 grains = 1 pound.
  • Ballistics is one of the few modern contexts where grains are essential.
  • Some older pharmacology dosing survives in grain units — 5 gr ≈ 325 mg.

Avoid these

  • Confusing the grain (mass) with the troy grain in older precious-metal contexts — they are identical (64.8 mg).
  • Assuming "grain" refers to an amount of cereal — in firearms it is always a weight.
  • Reading "5 gr" as 5 grams — it is 5 grains (324 mg).

Frequently asked questions

How many metric tons in a grain?
One grain equals 6.4799e-8 metric tons.
How do I convert grains to metric tons?
Multiply the grain value by 6.4799e-8 to get the equivalent in metric tons.
What is 100 grains in metric tons?
100 grains equals 6.4799e-6 metric tons.
Is a grain bigger than a metric ton?
No. 1 grain equals 6.4799e-8 metric tons, so one grain is smaller.
How to convert grains to metric tons without a calculator?
Multiply by 0 for a quick estimate; use a calculator for precise results.

Related weight conversions

📊 See full comparison matrix →

More from Grain

gr → kg
1 = 6.4799e-5 kg
gr → g
1 = 0.0648 g
gr → mg
1 = 64.7989 mg
gr → µg
1 = 64,798.91 µg
gr → lb
1 = 0.0001429 lb
gr → oz
1 = 0.002286 oz
gr → ton (US)
1 = 7.1429e-8 ton (US)
gr → ton (UK)
1 = 6.3776e-8 ton (UK)

More to Metric Ton

kg → t
1 = 0.001 t
g → t
1 = 1.0000e-6 t
mg → t
1 = 1.0000e-9 t
µg → t
1 = 1.0000e-12 t
lb → t
1 = 0.0004536 t
oz → t
1 = 2.8350e-5 t
ton (US) → t
1 = 0.9072 t
ton (UK) → t
1 = 1.01605 t

Conversions in other categories

LengthKilometer → MileTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootSpeedKilometer per Hour → Mile per HourEnergyKilojoule → KilocaloriePressureBar → Pound per Square InchPowerKilowatt → Mechanical Horsepower