Convert Cup to Barrel (cup → bbl)

Converting cups to barrels 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 cups

   Start with the number of cups (cup) you want to convert.
2. 2
   Multiply by 0.00151

   The conversion factor from cup to bbl is 0.00151. Multiply your value by this number.
3. 3
   Read the result in barrels

   The result is your value in barrels (bbl).

Multiply the value in cups by 0.00151. For the reverse direction, multiply by 662.44706.

• ✓US cup = 240 ml common; 236.6 ml legal; UK cup = 284 ml; metric cup (AU/NZ) = 250 ml.
• ✓Weights (grams) are more reliable than cups — a cup of flour can vary 30% depending on how packed.
• ✓For baking, always use the recipe author's country convention.

• ✗Using a UK 284 ml cup for a US recipe calling for 240 ml — 18% overshoot.
• ✗Treating all dry ingredients as 1 cup = 240 g — only true for water.
• ✗Using a coffee mug as a "cup" — mugs vary 200–400 ml.

What is the Cup?

The US cup equals exactly 240 milliliters (a definition standardized for nutrition labeling; the legal volume for cooking is 236.588 mL, derived from 8 US fluid ounces). The cup is the cornerstone of American baking and home cooking, with virtually every US recipe using volume measurements rather than the weight measurements common in European cooking. Standard measuring-cup sets include 1, ½, ⅓, and ¼ cup sizes. The metric cup (used in Australia, New Zealand, and increasingly in international recipes) is exactly 250 mL — slightly larger than the US cup. The cup relates to the gallon (16 cups = 1 gal), the pint (2 cups = 1 pt), the fluid ounce (8 fl oz = 1 cup), the tablespoon (16 tbsp = 1 cup), and the milliliter (1 cup ≈ 237–240 mL). American baking-by-volume is sometimes criticized internationally for its variability compared to gram-based measurements.

• US cooking and baking recipes
• Cereal and beverage serving sizes in US nutrition labels
• Volume estimation when no scale is available

What is the Barrel?

The oil barrel equals exactly 42 US gallons (158.987 liters) and is the global benchmark unit for crude oil pricing and trading. The 42-gallon size dates to the 1860s Pennsylvania oil boom, when oil was shipped in repurposed wooden barrels of various sizes; the standard settled at 42 gallons as a practical industry compromise. Today, the oil barrel is virtually synonymous with crude oil — Brent crude and WTI prices are quoted per barrel ($/bbl), OPEC tracks production in barrels per day, and proven reserves are listed in billions of barrels. Despite metrication, the barrel persists in petroleum trading and journalism worldwide. It relates to the US gallon (1 bbl = 42 US gal), the cubic meter (1 bbl ≈ 0.159 m³), and the liter (1 bbl ≈ 159 L). Note that beer and wine barrels have different volumes.

• Crude oil international pricing (Brent, WTI)
• Petroleum product reporting (OPEC, EIA)
• Energy-sector financial reporting