How volume conversion works
Every volume unit can be expressed in milliliters, so the converter turns the input into ml first, then into the target unit. This single base-unit step keeps any pair of units consistent:
in ml = amount × (ml per "from" unit)
result = in ml ÷ (ml per "to" unit)
The US customary factors used are: 1 cup = 236.588 ml, 1 tbsp = 14.787 ml, 1 tsp = 4.929 ml, 1 fl oz = 29.574 ml, and 1 ml = 1 ml.
Worked example
Convert 1 cup to milliliters:
To ml: 1 × 236.588 = 236.588 ml.
To ml (target): 236.588 ÷ 1 = 236.59 ml.
Check: 1 cup also equals 16 tbsp or 48 tsp.
US vs metric cup: this tool uses the US customary cup of 236.6 ml. Many recipes elsewhere use a 250 ml metric cup, so confirm the standard before scaling a recipe precisely.
Handy volume ratios
Some conversions are worth memorizing: 3 teaspoons make 1 tablespoon, 16 tablespoons make 1 cup, 2 cups make 1 pint and 8 fluid ounces fill 1 cup. With these you can rescale most recipes by hand, and the converter covers everything in between.