Convert weight and mass units — kilograms, pounds, grams, ounces, tons, carats and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 ct | 1.968e-10 L/T | |
| 0.01 ct | 1.96841e-09 L/T | |
| 0.1 ct | 1.96841e-08 L/T | |
| 1 ct | 1.96841e-07 L/T | |
| 5 ct | 9.84206e-07 L/T | |
| 10 ct | 1.96841e-06 L/T | |
| 50 ct | 9.84206e-06 L/T | |
| 100 ct | 1.96841e-05 L/T | |
| 1000 ct | 0.000196841 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 ct = 1.968413e-7 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.
| Carat (ct) | UK Long Ton (L/T) | Real-world context |
|---|---|---|
| 1 ct | 1.9684e-07 L/T | solitaire diamond |
| 1000 ct | 0.00019684 L/T | |
| 1,000,000 ct | 0.19684129 L/T | |
| 1.0000e+09 ct | 196.8413 L/T | |
| 1.0000e+12 ct | 196841.2879 L/T |
1 carat (ct) equals exactly 1.9684e-07 UK long tons (L/T). Use the formula: ct × 1.9684e-07 = L/T.
To convert carats to UK long tons, multiply your value in carats by 1.9684e-07. For example, 5 ct × 1.9684e-07 = 9.8421e-07 L/T.
100 carats = 1.9684e-05 UK long tons. Calculation: 100 × 1.9684e-07 = 1.9684e-05.
To convert UK long tons back to carats, divide by 1.9684e-07 (or multiply by 5,080,235). Example: 10 L/T ÷ 1.9684e-07 = 50,802,350 ct.
Yes. This converter uses the internationally recognised exact conversion factor: 1 ct = 1.9684e-07 L/T. All calculations are performed in your browser with no rounding until display.
10 carats = 1.9684e-06 UK long tons. Simply multiply by 1.9684e-07.
Converting carats to UK long tons is commonly needed for jewellery valuation, gemstone trading, precious metal buying and selling, and hallmarking compliance where one system uses ct and another uses L/T.
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 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 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.
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.