Milliliter to Gram (ML in Grams) Converter

More Converters

IU to Mg Converter
IU To Mcg
Liter To Kg
MPG to Liters per 100km Converter
Gallon to Liter Converter Calculator

How to Convert mL to Grams and Grams to mL (With Examples and a Conversion Chart)

If you’ve ever stared at a recipe, a medication dose, or a lab worksheet that mixes milliliters and grams, you’ve probably wondered whether the two even mean the same thing. They don’t, not exactly. But the conversion between them is simple once you know one thing: the density of whatever you’re measuring. This guide walks through the formula, shows you exactly how to convert mL to grams and grams back to mL, and works through real numbers so you can check your own math.

ML as Grams: The Quick Answer

Milliliters measure volume. Grams measure mass. They’re only interchangeable, mL for mL, when you’re dealing with something that has a density of 1 gram per milliliter, and water at room temperature is the classic example. So 1 mL of water weighs 1 gram, 100 mL of water weighs 100 grams, and so on, a clean 1:1 relationship.

For anything else, milk, honey, oil, saline, syrup, you need the substance’s density to get an accurate weight. The good news is that the math itself never changes, only the density number you plug in.

How to Convert mL to Grams

The formula is:

grams = milliliters × density (g/mL)

Multiply your volume in milliliters by the density of the substance, and you get the weight in grams. For water, density is 1.0 g/mL, so the multiplication barely changes the number. For something denser, like honey at roughly 1.42 g/mL, the gram figure comes out noticeably higher than the mL figure. For something lighter, like vegetable oil at roughly 0.92 g/mL, the gram figure comes out a little lower.

• Step 1: Find the density of your substance (in g/mL).
• Step 2: Multiply the volume in mL by that density.
• Step 3: The result is your weight in grams.

How to Convert Grams to mL

Going the other direction just flips the formula:

milliliters = grams ÷ density (g/mL)

Divide the weight in grams by the density, and you get the volume back in milliliters. This is the version you’ll use when a recipe or a dosing chart gives you a weight and you need to measure it out with a syringe, cup, or beaker marked in mL.

• Step 1: Find the density of your substance (in g/mL).
• Step 2: Divide the weight in grams by that density.
• Step 3: The result is your volume in milliliters.

mL as Grams: Worked Examples (Using Water, 1 g/mL)

Water is the easiest starting point because the density is exactly 1, so the mL number and the gram number match. These are the calculations most people are actually looking for when they search a specific volume.

5 mL to Grams

5 mL × 1 g/mL = 5 grams

10 mL to Grams

10 mL × 1 g/mL = 10 grams

15 mL to Grams

15 mL × 1 g/mL = 15 grams

50 mL to Grams

50 mL × 1 g/mL = 50 grams

100 mL to Grams

100 mL × 1 g/mL = 100 grams

Notice the pattern: for water, and only for water, the gram figure and the mL figure are always identical. That’s why this specific conversion trips people up less than it should, the 1:1 relationship only holds for water and water-based liquids close to it, like saline. Anything with a different density needs the full formula above.

Quick-Reference Conversion Chart

Here’s how those same five volumes convert once you’re working with an ingredient other than water. Use this if you already know your substance’s density, or check the density table further down.

Volume (mL)	Water (1.00 g/mL)	Milk (1.03 g/mL)	Honey (1.42 g/mL)	Vegetable Oil (0.92 g/mL)
5 mL	5 g	5.15 g	7.1 g	4.6 g
10 mL	10 g	10.3 g	14.2 g	9.2 g
15 mL	15 g	15.45 g	21.3 g	13.8 g
50 mL	50 g	51.5 g	71 g	46 g
100 mL	100 g	103 g	142 g	92 g

 

Common Ingredient Densities (Per 100 mL)

If your substance isn’t water, this is the number you actually need. These are typical reference densities; brand, temperature, and how tightly something is packed can shift the real-world figure slightly.

Ingredient	Density (g/mL)	100 mL in Grams
Water	1.00	100 g
Milk (whole)	1.03	103 g
Saline (0.9%)	1.005	100.5 g
Honey	1.42	142 g
Olive Oil	0.92	92 g
Granulated Sugar	0.70	70 g
All-Purpose Flour	0.53	53 g

 

Grams to mL: A Worked Example

Say a dosing chart calls for 30 grams of a saline solution and you need to draw that up with a syringe marked in mL. Saline is close enough to water that a density of 1.005 g/mL is a reasonable estimate:

30 g ÷ 1.005 g/mL ≈ 29.85 mL

In practice, that rounds to about 30 mL, since saline’s density is so close to water’s that the difference rarely matters outside a lab setting.

Why the Density Matters

The reason mL and grams aren’t automatically interchangeable comes down to how tightly packed a substance’s molecules are. A milliliter of honey has more mass squeezed into the same space than a milliliter of water, so it weighs more. A milliliter of vegetable oil has less, so it weighs less. Temperature affects this too; liquids expand slightly when warm and contract when cold, which is part of why very precise lab and pharmacy work accounts for temperature alongside density.

Frequently Asked Questions

Is 1 mL equal to 1 gram?

Only for water, and for liquids with a density very close to water’s, like dilute saline. For anything denser or lighter, the two units diverge.

How many grams is 100 mL of water?

Exactly 100 grams, since water’s density is 1.00 g/mL.

How many grams is 50 mL of milk?

About 51.5 grams, using milk’s typical density of 1.03 g/mL.

Can I use this same formula for medication dosing?

The formula holds, but density varies by solution and concentration, so always use the density or concentration specified on the label or by a pharmacist rather than assuming a 1:1 ratio, unless you’re working with plain water or standard saline.

Why doesn’t my kitchen scale match this chart exactly?

Small variations in brand, temperature, and how a liquid was measured (leveled versus heaping, for solids) can shift real-world results slightly from reference densities. For anything where precision really matters, a digital scale is more reliable than a volume measurement.

Try the Calculator

Rather than doing the multiplication by hand, our mL to Gram Converter runs this calculation instantly, for water, saline, and dozens of other common substances, in both directions, mL to grams and grams to mL.