This converter turns grains into US tons instantly, using the exact factor 1 grain = 7.142857143e-08 US tons. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The oldest English mass unit, now used for bullets, arrows and propellant charges. The short ton: 2,000 pounds, the standard ton in the United States.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
grains- The amount you are converting, measured in grains
7.142857143e-08- The exact number of US tons in one grain
US tons- The converted result
How it works, step by step
- Enter the number of grains you want to convert.
- The value is multiplied by 7.142857143e-08, the exact conversion factor.
- The result is displayed in US tons, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 grains
Multiply 5 by 7.1428571e-08. That gives 3.5714e-07 US tons. A quick sanity check: one grain is smaller than one US ton, so the number should get smaller — and it does.
Converting 72 grains
72 × 7.1428571e-08 = 0.000005 US tons. Working backwards, 0.000005 ÷ 7.1428571e-08 returns 72 grains, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many US tons are in one grain?
Exactly 7.142857143e-08. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert grains to US tons?
Us Tons = grains × 7.142857143e-08. To reverse it, divide instead: grains = US tons ÷ 7.142857143e-08, which is the same as multiplying by 14000000.
Is the grain bigger than the US ton?
No. One grain is only 7.14286e-08 of a US ton, so the US ton is the larger unit.
Why does my answer differ slightly from other grains to us-tons converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a grain?
The oldest English mass unit, now used for bullets, arrows and propellant charges.
What is a US ton?
The short ton: 2,000 pounds, the standard ton in the United States.
Grains to US tons reference table
| Grains | Us Tons |
|---|---|
| 0.5 gr | 3.5714e-08 ton |
| 1 gr | 7.1429e-08 ton |
| 2 gr | 1.4286e-07 ton |
| 3 gr | 2.1429e-07 ton |
| 5 gr | 3.5714e-07 ton |
| 10 gr | 7.1429e-07 ton |
| 15 gr | 0.000001 ton |
| 20 gr | 0.000001 ton |
| 25 gr | 0.000002 ton |
| 50 gr | 0.000004 ton |
| 75 gr | 0.000005 ton |
| 100 gr | 0.000007 ton |
| 250 gr | 0.000018 ton |
| 500 gr | 0.000036 ton |
| 1000 gr | 0.000071 ton |
Exact factor: 1 grain = 7.142857143e-08 US tons. Values rounded for display.