Convert UK Ton to Carat (ton (UK) → ct)

Converting UK tons to carats is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.

1. 1
   Take your value in UK tons

   Start with the number of UK tons (ton (UK)) you want to convert.
2. 2
   Multiply by 5,080,234.5

   The conversion factor from ton (UK) to ct is 5,080,234.5. Multiply your value by this number.
3. 3
   Read the result in carats

   The result is your value in carats (ct).

Multiply the value in UK tons by 5,080,234.5. For the reverse direction, multiply by 1.968e-7.

• ✓1 UK long ton = 2240 lb = 1016 kg.
• ✓Modern British commerce uses the metric ton (tonne); long tons are mostly historical.
• ✓Always check the era of a document before assuming "ton" means short, long or metric.

• ✗Assuming a pre-1980 UK contract uses metric tons — it probably uses long tons.
• ✗Mixing long tons and short tons across the Atlantic — the 12% gap matters.
• ✗Using 1000 kg as a shortcut for a British historical "ton".

What is the UK Ton?

The UK long ton equals exactly 2,240 pounds or 1,016.0469088 kilograms, and was historically the standard weight unit in the British Empire and remains in use in shipping, mining, and engineering throughout the United Kingdom and Commonwealth countries. The long ton is closer in size to the metric ton (only 1.6% lighter), which is why it has resisted complete replacement. Shipping displacement, especially of older and military vessels, is often quoted in long tons (the British Royal Navy historically used long tons for ship tonnage). It relates to the hundredweight (20 cwt = 1 long ton), the pound (2,240 lb = 1 long ton), and the metric ton (1 long ton ≈ 1.016 t). The long ton's name reflects its larger size compared to the US short ton (2,000 lb).

• Older UK shipping and commodity contracts
• British naval displacement tonnage (ships)
• Historical coal and steel production data

What is the Carat?

The carat equals exactly 200 milligrams (0.2 g) and is the universal unit for gemstone and diamond weight in the global jewelry industry. The word derives from the Greek 'keration' and the Arabic 'qīrāṭ,' both referring to carob seeds, which were once used as natural counterweights for weighing gems because they have remarkably uniform mass. The metric carat was standardized in 1907 at exactly 200 mg, replacing dozens of regional carat values that had varied between 188 and 213 mg. A 1-carat diamond is roughly 6.5 mm in diameter, and the famous Hope Diamond weighs 45.52 carats. The carat is distinct from the karat (with a 'k'), which measures gold purity (24-karat = 100% gold). It relates to the gram (5 ct = 1 g) and the milligram (200 mg = 1 ct). Gem dealers commonly use 'points' for fractions (100 points = 1 carat).

• Diamond and gemstone retail and valuation
• Jewellery manufacturing and design
• International gem certification (GIA, IGI)