Convert weight and mass units — kilograms, pounds, grams, ounces, tons, carats and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 gr | 6.378e-11 L/T | |
| 0.01 gr | 6.378e-10 L/T | |
| 0.1 gr | 6.37766e-09 L/T | |
| 1 gr | 6.37766e-08 L/T | |
| 5 gr | 3.18883e-07 L/T | |
| 10 gr | 6.37766e-07 L/T | |
| 50 gr | 3.18883e-06 L/T | |
| 100 gr | 6.37766e-06 L/T | |
| 1000 gr | 6.37766e-05 L/T |
The Milligram (mg) and the Gram (g) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 gr = 6.377658e-8 L/T
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Grain (gr) | UK Long Ton (L/T) | Real-world context |
|---|---|---|
| 1 gr | 6.3777e-08 L/T | grain of wheat |
| 1000 gr | 6.3777e-05 L/T | |
| 1,000,000 gr | 0.06377658 L/T | |
| 1.0000e+09 gr | 63.7765773 L/T | |
| 1.0000e+12 gr | 63776.5773 L/T |
1 grain (gr) equals exactly 6.3777e-08 UK long tons (L/T). Use the formula: gr × 6.3777e-08 = L/T.
To convert grains to UK long tons, multiply your value in grains by 6.3777e-08. For example, 5 gr × 6.3777e-08 = 3.1888e-07 L/T.
100 grains = 6.3777e-06 UK long tons. Calculation: 100 × 6.3777e-08 = 6.3777e-06.
To convert UK long tons back to grains, divide by 6.3777e-08 (or multiply by 15,679,738). Example: 10 L/T ÷ 6.3777e-08 = 156,797,377 gr.
Yes. This converter uses the internationally recognised exact conversion factor: 1 gr = 6.3777e-08 L/T. All calculations are performed in your browser with no rounding until display.
10 grains = 6.3777e-07 UK long tons. Simply multiply by 6.3777e-08.
Converting grains to UK long tons is commonly needed for jewellery valuation, gemstone trading, precious metal buying and selling, and hallmarking compliance where one system uses gr and another uses L/T.
The grain (gr) is the smallest unit in the avoirdupois, troy, and apothecary weight systems, equal to exactly 64.79891 milligrams (0.06479891 g). All three systems share the same grain as base: one avoirdupois pound = 7,000 grains; one troy pound = 5,760 grains. The grain is still used in ballistics (bullet and powder weights) and some pharmaceutical contexts.
The UK long ton (symbol L/T, also "imperial ton" or "gross ton") equals 2,240 avoirdupois pounds or 1,016.0469088 kilograms. Used in Britain for coal and shipping, it is slightly larger than both the US short ton (2,000 lb) and the metric ton (1,000 kg). Britain adopted metric units in 1965 and the long ton is no longer used in new UK trade contracts, though it appears in historical records.
The grain is among the oldest measurement units in history, derived from the average weight of a grain of barleycorn (or wheat) — a practical standard used in ancient Egypt, Greece, and Rome. England formalised the barleycorn grain in the 15th century as the foundation of its weight system. The British Weights and Measures Act 1824 defined the grain, and the value remains unchanged today.
Interesting fact: The original grain was calibrated by laying dried barleycorns end-to-end — 32 grains equalled one inch in 13th-century England. Today, 9mm pistol bullets typically weigh 115–147 grains (7.5–9.5 g), and gunpowder charges are specified in grains for reloading.
The long ton traces to medieval England, where a "wine tun" was a large barrel of ~252 gallons. A standard ship's cargo unit ("ton burden") evolved into a 2,240-pound standard because 2,240 lb = 20 hundredweight (each of 112 lb) — convenient for counting by the hundredweight. The Coal Industry Act 1831 formalised the long ton for coal. British Overseas Territories and some US steel industry sectors still use it.
Interesting fact: HMS Victory, Nelson's flagship at Trafalgar (1805), was rated at 2,162 long tons displacement. Modern international shipping uses metric tons (deadweight tonnage), but engineers working with pre-1965 British specifications regularly need long ton conversions.