Liquid conversions are complicated by the fact that there are so many US measurements of relatively similar sizes. However, because all US measurements are evenly divisible by teaspoons, someone could get by with only knowing the conversion factor for teaspoons and milliliters, so long as they also know how many tsp are in each US measure.

Inch-pound -> Metric

• gal -> L: • by 3.785412
• qt -> L: • by 0.9463529
• pt -> L: • by 0.4731765
• pt -> mL: • by 473.1765
• cup -> L: • by 0.23658825
• cup -> mL: • by 236.58825
• oz -> mL: • by 29.57353
• tbs -> mL: • by 14.786765001
• tsp -> mL: • by 4.928921667

Metric -> Inch-pound

• L -> gal: • by 0.264172037
• L -> qt: • by 1.056688261
• L -> pt: • by 2.113376298
• L -> cup: • by 4.226752597
• mL -> pt: • by 0.002113376
• mL -> cup: • by 0.004226753
• mL -> oz: • by 0.033814022
• mL -> tbs: • by 0.067628044
• mL -> tsp: • by 0.202884133