Grams to Milliliters Converter (g to mL)

How to Convert Grams to Milliliters

Grams (g) measure mass — how heavy something is. Milliliters (mL) measure volume — the space it occupies. To convert between them, you need to know the density of the substance.

The conversion formula is:

Why the Same Weight Takes Up Different Amounts of Space

Imagine you have exactly 100 grams of three different ingredients sitting on your kitchen scale. They all weigh the same, but they look completely different:

• 100 g of water = 100 mL (about 0.42 cups) — fits in a small glass
• 100 g of flour = 188.7 mL (about 0.80 cups) — fills nearly a full measuring cup
• 100 g of rolled oats = 277.8 mL (about 1.17 cups) — overflows a measuring cup
• 100 g of honey = 70.4 mL (about 0.30 cups) — barely fills a third of a cup

This happens because each substance has a different density. Lighter, fluffier substances (oats, flour) take up much more space per gram. Dense, heavy substances (honey, salt) take up much less.

Gram to Milliliter Reference Table — Common Ingredients

Ingredient	Density	100 g =	250 g =	500 g =
Water	1.00 g/mL	100 mL	250 mL	500 mL
Whole Milk	1.03 g/mL	97.1 mL	242.7 mL	485.4 mL
All-Purpose Flour	0.53 g/mL	188.7 mL	471.7 mL	943.4 mL
Granulated Sugar	0.85 g/mL	117.6 mL	294.1 mL	588.2 mL
Brown Sugar	0.93 g/mL	107.5 mL	268.8 mL	537.6 mL
Honey	1.42 g/mL	70.4 mL	176.1 mL	352.1 mL
Olive Oil	0.92 g/mL	108.7 mL	271.7 mL	543.5 mL
Butter (melted)	0.91 g/mL	109.9 mL	274.7 mL	549.5 mL
Table Salt	1.22 g/mL	82.0 mL	204.9 mL	409.8 mL
Cocoa Powder	0.52 g/mL	192.3 mL	480.8 mL	961.5 mL
Rolled Oats	0.36 g/mL	277.8 mL	694.4 mL	1388.9 mL
Maple Syrup	1.33 g/mL	75.2 mL	188.0 mL	375.9 mL

Converting Grams to US Cups

American recipes frequently use cups, tablespoons, and teaspoons. Here's how common weights translate to US cups for popular ingredients:

Ingredient	100 g	200 g	500 g
All-Purpose Flour	0.80 cups	1.59 cups	3.99 cups
Granulated Sugar	0.50 cups	0.99 cups	2.49 cups
Butter	0.46 cups	0.93 cups	2.32 cups
Honey	0.30 cups	0.59 cups	1.49 cups
Rolled Oats	1.17 cups	2.35 cups	5.87 cups
Cocoa Powder	0.81 cups	1.63 cups	4.06 cups
Rice (uncooked)	0.50 cups	0.99 cups	2.49 cups

When to Convert Grams to Milliliters

• Following European or metric recipes: Many recipes from Europe, Asia, and Australia list ingredients by weight (grams). If you only have volumetric measuring tools (cups, tablespoons), you need to convert grams to mL so you can measure correctly.
• Scaling recipes up or down: When you know the weight of an ingredient but need to know how much space it takes up in your mixing bowl or pot, gram-to-mL conversion is essential.
• Substituting ingredients: If a recipe calls for 200g of sugar but you want to use honey instead, converting both to mL helps you understand the volume difference and adjust your mixing/baking time accordingly.
• Science lab work: When you need a specific mass of a liquid chemical but only have graduated cylinders (which measure volume), you divide grams by density to get the correct mL to pour.
• Portioning and meal prep: Nutrition labels list serving sizes in grams. Converting to mL or cups helps you visualize portion sizes more intuitively when scooping or pouring.

Common Gram-to-mL Mistakes to Avoid

• Assuming 1 g = 1 mL for everything: This only works for water. Using this assumption for flour would give you almost twice as much flour as needed.
• Ignoring how ingredients are measured: "1 cup of flour" can be 120g (spooned) or 150g (scooped). When a recipe says "125g flour," it means exactly 125g — not approximately 1 cup.
• Confusing fluid ounces with ounces: Fluid ounces (fl oz) measure volume. Ounces (oz) measure weight. They're only the same for water. 1 fl oz of honey weighs about 1.5 oz.
• Not accounting for temperature: Density changes with temperature. Melted butter (0.91 g/mL) has a different density than solid butter (~0.96 g/mL). Our calculator uses liquid/melted densities for items commonly melted.