Milliliters to Grams Converter (mL to g)

How to Convert Milliliters to Grams

Milliliters (mL) measure volume — the amount of space a substance occupies. Grams (g) measure mass — how heavy it is. Because different substances have different densities, 1 mL does NOT always equal 1 gram.

The conversion formula is:

What Is Density and Why Does It Matter?

Density is the mass of a substance per unit volume — typically expressed as grams per milliliter (g/mL). Water has a density of exactly 1.0 g/mL at 4°C, which is why it's the baseline: 1 mL of water = 1 gram. But most other substances differ:

• Heavier than water (density > 1): Honey (1.42), salt (1.22), maple syrup (1.33), soy sauce (1.08)
• Lighter than water (density < 1): Flour (0.53), oil (0.92), oats (0.36), cocoa powder (0.52)

This is why recipes that specify ingredients by weight (grams) are more accurate than those using volume (cups/mL) — the density of flour can vary by 20% or more depending on how tightly it's packed.

Common Ingredient Densities — Reference Table

Ingredient	Density (g/mL)	100 mL =	1 Cup (237 mL) =
Water	1.00	100 g	237 g
Whole Milk	1.03	103 g	244 g
Heavy Cream	1.01	101 g	239 g
All-Purpose Flour	0.53	53 g	126 g
Granulated Sugar	0.85	85 g	201 g
Powdered Sugar	0.56	56 g	133 g
Brown Sugar (packed)	0.93	93 g	220 g
Honey	1.42	142 g	337 g
Maple Syrup	1.33	133 g	315 g
Olive Oil	0.92	92 g	218 g
Vegetable Oil	0.92	92 g	218 g
Butter (melted)	0.91	91 g	216 g
Coconut Oil (melted)	0.92	92 g	218 g
Table Salt	1.22	122 g	289 g
Cocoa Powder	0.52	52 g	123 g
Rice (uncooked)	0.85	85 g	201 g
Rolled Oats	0.36	36 g	85 g
Baking Powder	0.90	90 g	213 g
Soy Sauce	1.08	108 g	256 g
Vanilla Extract	1.04	104 g	247 g

Kitchen Volume Equivalents

When converting recipes between US customary measurements and metric, these equivalents are essential:

US Measure	Milliliters (mL)	Grams (Water)
1 teaspoon (tsp)	4.93 mL	4.93 g
1 tablespoon (tbsp)	14.79 mL	14.79 g
1 fluid ounce (fl oz)	29.57 mL	29.57 g
1/4 cup	59.15 mL	59.15 g
1/3 cup	78.86 mL	78.86 g
1/2 cup	118.29 mL	118.29 g
1 cup	236.59 mL	236.59 g
1 pint	473.18 mL	473.18 g
1 quart	946.35 mL	946.35 g

Note: The gram values above are for water only. For other substances, multiply the mL by the ingredient's density from the table above.

When to Convert Milliliters to Grams

• Baking and cooking: Professional bakers measure by weight (grams) for precision. Converting volume-based recipes to weight-based eliminates variability from how tightly an ingredient is packed.
• Nutrition tracking: Food labels in the US list serving sizes by weight. If you measure ingredients by volume at home, converting to grams gives you accurate calorie and macro counts.
• Pharmacy and medicine: Liquid medication dosages are often in mL, but active ingredient amounts are in mg or g. Understanding the density relationship helps verify correct dosing.
• Chemistry and science: Chemical reactions require precise mass measurements. When mixing liquids of different densities, volume-to-mass conversion ensures accurate stoichiometric ratios.
• Shipping and packaging: Converting liquid volume to weight helps calculate shipping costs, which are typically based on weight.

Why 1 mL Does NOT Equal 1 Gram (Except Water)

The common misconception that 1 mL = 1 gram comes from water's unique property: its density is defined as exactly 1.0 g/mL at 4°C. This was actually the original basis for defining the gram — 1 gram was defined as the mass of 1 cubic centimeter (= 1 mL) of water.

But for any other substance, the relationship changes:

• 100 mL of flour ≈ 53 g (almost half the weight of water)
• 100 mL of honey ≈ 142 g (42% heavier than water)
• 100 mL of rolled oats ≈ 36 g (barely a third the weight of water)

This is why professional recipes worldwide are moving to weight-based measurements — they're universally reproducible regardless of how you scoop, pack, or pour an ingredient.