Convert Grains to Metric Tons
1 grain (gr) equals 6.479891 × 10⁻⁸ metric tons (t).
1 gr = 6.479891e-8 t
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk grain to metric ton converter to paste a column from Excel.
How to Convert Grain to Metric Ton
- 1 gr = 6.479891 × 10⁻⁸ t
- 1 t = 15432358.35 gr
- Example: convert 15 gr to t: 15 gr = 15 × 6.479891 × 10⁻⁸ t = 9.7198365 × 10⁻⁷ t
Reference conditions. gr: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
t = gr × 6.479891 × 10⁻⁸
or t = gr ÷ 15432358.35294
Derivation from SI units:
- 1 gr = 1/7000 lb = 64.79891 mg (exact)
- 1 t = 1000 kg (accepted for use with the SI)
- 1 gr = 0.00006479891 kg ÷ 1000 kg per t = 6.479891 × 10⁻⁸ t
Both units are defined exactly, so the factor is exact. Grain definition: grain; Metric Ton definition: metric ton.
Worked examples
- A reading of 40 gr converts to 0.0000025919564 t.
40 gr × 6.479891 × 10⁻⁸ = 0.0000025919564 t - A value of 150 gr is 0.0000097198365 t.
150 gr × 6.479891 × 10⁻⁸ = 0.0000097198365 t
Grain to Metric Ton conversion table
| Grains (gr) | Metric Tons (t) |
|---|---|
| 1 gr | 6.479891 × 10⁻⁸ t |
| 5 gr | 3.2399455 × 10⁻⁷ t |
| 10 gr | 6.479891 × 10⁻⁷ t |
| 15 gr | 9.7198365 × 10⁻⁷ t |
| 20 gr | 0.0000012959782 t |
| 40 gr | 0.0000025919564 t |
| 55 gr | 0.00000356394005 t |
| 100 gr | 0.000006479891 t |
| 115 gr | 0.00000745187465 t |
| 124 gr | 0.00000803506484 t |
| 150 gr | 0.0000097198365 t |
| 180 gr | 0.0000116638038 t |
| 300 gr | 0.000019439673 t |
| 1000 gr | 0.00006479891 t |
| 7000 gr | 0.00045359237 t |
Where it's used
Grains are used for bullet and powder weights, while metric tons appear in vehicle and crane capacities. Both measure mass (commonly called weight), so the conversion is a fixed factor.
Grain to other weight and mass units
| Conversion | 1 gr equals |
|---|---|
| grain to kilogram | 0.00006479891 kg |
| grain to gram | 0.06479891 g |
| grain to milligram | 64.79891 mg |
| grain to microgram | 64798.91 µg |
| grain to metric ton | 6.479891 × 10⁻⁸ t |
| grain to pound | 0.0001428571429 lb |
| grain to ounce | 0.002285714286 oz |
| grain to stone | 0.00001020408163 st |
| grain to short ton | 7.142857143 × 10⁻⁸ ton (US) |
| grain to long ton | 6.37755102 × 10⁻⁸ ton (UK) |
| grain to troy ounce | 0.002083333333 oz t |
| grain to carat | 0.32399455 ct |
Frequently asked questions
How many metric tons are in 1 grain?
1 gr = 6.479891 × 10⁻⁸ t.
How do I convert grains to metric tons?
Multiply the value in gr by 6.479891 × 10⁻⁸, or divide it by 15432358.35. For example, 15 gr × 6.479891 × 10⁻⁸ = 9.7198365 × 10⁻⁷ t.
Is the gr to t conversion exact?
Yes. Both units are defined exactly, and 1 gr is exactly 6.479891 × 10⁻⁸ t.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "grain (gr)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8, non-SI units accepted for use with the SI.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Grains to Metric Tons. Retrieved October 17, 2026, from https://scientificconverters.com/mass/grains-to-metric-tons/
IEEE
Scientific Converters, "Convert Grains to Metric Tons," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/grains-to-metric-tons/