Convert Grains to Long Tons
1 grain (gr) equals 6.37755102 × 10⁻⁸ long tons (ton (UK)).
1 gr = 6.37755102e-8 ton (UK)
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk grain to long ton converter to paste a column from Excel.
How to Convert Grain to Long Ton
- 1 gr = 6.37755102 × 10⁻⁸ ton (UK)
- 1 ton (UK) = 15680000 gr
- Example: convert 15 gr to ton (UK): 15 gr = 15 × 6.37755102 × 10⁻⁸ ton (UK) = 9.566326531 × 10⁻⁷ ton (UK)
Reference conditions. gr: Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement). ton (UK): Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Formula
ton (UK) = gr ÷ 15680000
Derivation from SI units:
- 1 gr = 1/7000 lb = 64.79891 mg (exact)
- 1 long ton = 2240 lb = 1016.0469088 kg (exact)
- 1 gr = 0.00006479891 kg ÷ 1016.0469088 kg per ton (UK) = 6.377551020408 × 10⁻⁸ ton (UK)
Both units are defined exactly, so the factor is exact. Grain definition: grain; Long Ton definition: long ton.
Worked examples
- A reading of 40 gr converts to 0.000002551020408 ton (UK).
40 gr × 6.37755102 × 10⁻⁸ = 0.000002551020408 ton (UK) - A value of 150 gr is 0.000009566326531 ton (UK).
150 gr × 6.37755102 × 10⁻⁸ = 0.000009566326531 ton (UK)
Grain to Long Ton conversion table
| Grains (gr) | Long Tons (ton (UK)) |
|---|---|
| 1 gr | 6.37755102 × 10⁻⁸ ton (UK) |
| 5 gr | 3.18877551 × 10⁻⁷ ton (UK) |
| 10 gr | 6.37755102 × 10⁻⁷ ton (UK) |
| 15 gr | 9.566326531 × 10⁻⁷ ton (UK) |
| 20 gr | 0.000001275510204 ton (UK) |
| 40 gr | 0.000002551020408 ton (UK) |
| 55 gr | 0.000003507653061 ton (UK) |
| 100 gr | 0.00000637755102 ton (UK) |
| 115 gr | 0.000007334183673 ton (UK) |
| 124 gr | 0.000007908163265 ton (UK) |
| 150 gr | 0.000009566326531 ton (UK) |
| 180 gr | 0.00001147959184 ton (UK) |
| 300 gr | 0.00001913265306 ton (UK) |
| 1000 gr | 0.0000637755102 ton (UK) |
| 7000 gr | 0.0004464285714 ton (UK) |
Where it's used
Grains are used for bullet and powder weights, while long tons appear in ship displacement and deadweight tonnage. 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 long tons are in 1 grain?
1 gr = 6.37755102 × 10⁻⁸ ton (UK).
How do I convert grains to long tons?
Multiply the value in gr by 6.37755102 × 10⁻⁸, or divide it by 15680000. For example, 15 gr × 6.37755102 × 10⁻⁸ = 9.566326531 × 10⁻⁷ ton (UK).
Is the gr to ton (UK) conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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)".
- 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, "ton, long (2240 lb)".
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 Long Tons. Retrieved October 17, 2026, from https://scientificconverters.com/mass/grains-to-long-tons/
IEEE
Scientific Converters, "Convert Grains to Long Tons," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/mass/grains-to-long-tons/