Convert weight and mass units — kilograms, pounds, grams, ounces, tons, carats and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 L/T | 5080.23 ct | |
| 0.01 L/T | 50802.3 ct | |
| 0.1 L/T | 508024 ct | |
| 1 L/T | 5.08024e+06 ct | |
| 5 L/T | 2.54012e+07 ct | |
| 10 L/T | 5.08024e+07 ct | |
| 50 L/T | 2.54012e+08 ct | |
| 100 L/T | 5.08024e+08 ct | |
| 1000 L/T | 5.08024e+09 ct |
The Milligram (mg) and the Gram (g) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 L/T = 5080235 ct
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| UK Long Ton (L/T) | Carat (ct) | Real-world context |
|---|---|---|
| 1.0000e-06 L/T | 5.080235 ct | |
| 0.001 L/T | 5080.235 ct | |
| 0.01 L/T | 50802.35 ct | |
| 0.1 L/T | 508023.5 ct | |
| 1 L/T | 5,080,235 ct | 2240 lb / large car |
1 uk long ton (L/T) equals exactly 5,080,235 carats (ct). Use the formula: L/T × 5,080,235 = ct.
To convert UK long tons to carats, multiply your value in UK long tons by 5,080,235. For example, 5 L/T × 5,080,235 = 25,401,175 ct.
100 UK long tons = 508,023,500 carats. Calculation: 100 × 5,080,235 = 508,023,500.
To convert carats back to UK long tons, divide by 5,080,235 (or multiply by 1.9684e-07). Example: 10 ct ÷ 5,080,235 = 1.9684e-06 L/T.
Yes. This converter uses the internationally recognised exact conversion factor: 1 L/T = 5,080,235 ct. All calculations are performed in your browser with no rounding until display.
10 UK long tons = 50,802,350 carats. Simply multiply by 5,080,235.
Converting UK long tons to carats is commonly needed for jewellery valuation, gemstone trading, precious metal buying and selling, and hallmarking compliance where one system uses L/T and another uses ct.
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 metric carat (ct) is the unit of mass used worldwide for gemstones and pearls, equal to exactly 200 milligrams (0.2 g). It is distinct from "karat" (K), the measure of gold purity (24K = 100% gold). A 1-carat diamond weighs exactly 0.2 g; the famous 45.52-carat Hope Diamond weighs approximately 9.1 g.
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.
The word "carat" derives from Greek keration (κεράτιον), meaning carob pod. Carob seeds were believed to have remarkably uniform weight and were used as counterweights for balancing precious stones. The carat value varied across countries (0.187–0.216 g) until the Fourth General Conference on Weights and Measures standardised the metric carat at exactly 200 mg in 1907. Most countries adopted the metric carat between 1914 and 1930.
Interesting fact: The largest gem-quality diamond ever found, the Cullinan Diamond (1905), weighed 3,106.75 carats (621.35 g) before being cut into 9 major and 96 minor stones, two of which are in the British Crown Jewels.