Grams to mL Converter

How to use this calculator

Enter the gram amount. Select the substance from the dropdown. Each substance shows its density in g/mL. Press Calculate to see millilitres, litres, US cups, and fluid ounces.

Mass and volume: why density connects them

Grams measure mass: the amount of matter in a substance. Millilitres measure volume: the amount of space it occupies. These are different physical quantities and cannot be converted without knowing the density of the substance.

Density tells you how many grams are packed into each millilitre of that substance. Water has a density of 1.000 g/mL, which means 1 gram of water takes up exactly 1 mL. This is the definition of the gram: it was originally defined as the mass of 1 mL of water at 4°C.

Every other substance has a density different from 1.000 g/mL:

• Honey (1.420 g/mL): heavier than water, takes up less volume per gram
• Olive oil (0.915 g/mL): lighter than water, takes up more volume per gram

Density of common cooking liquids and substances

Substance	Density (g/mL)	100 g =
Water	1.000	100 mL
Whole milk	1.030	97.1 mL
Soy milk	1.033	96.8 mL
Heavy cream	0.994	100.6 mL
Vegetable oil	0.920	108.7 mL
Olive oil	0.915	109.3 mL
Sunflower oil	0.875	114.3 mL
Honey	1.420	70.4 mL
Maple syrup	1.360	73.5 mL
Ethanol (pure alcohol)	0.789	126.7 mL
Seawater (approx)	1.026	97.5 mL

Notice that oils are all less dense than water (they float on water). Syrups and honey are denser than water (they sink). This is why oil and water separate when shaken together in a bottle.

Grams to mL for water and approximate substitutions

For water, the conversion is exact: 1 g = 1 mL. This makes water-based liquids easy to convert. For dilute solutions like stock, juice, or tea, the density is close enough to water that 1 g ≈ 1 mL works for most cooking purposes.

When the approximation fails:

The 1:1 approximation for water fails for:

• Honey: 100 g = 70.4 mL (30% error if you assume 100 mL)
• Maple syrup: 100 g = 73.5 mL (27% error)
• Olive oil: 100 g = 109.3 mL (9% error)

For honey and thick syrups, using a scale rather than measuring in mL avoids the approximation error. The scale gives grams directly without needing to know the density.

How temperature affects density and volume

The density of liquids changes with temperature. Water is densest at 4°C (1.000 g/mL). At 20°C it is 0.998 g/mL. At 80°C it is 0.972 g/mL. For everyday cooking this difference (about 3% from cold to near-boiling) is negligible.

Oils show a similar pattern: olive oil at 20°C has density 0.915 g/mL; at 60°C it drops to about 0.898 g/mL. For precise manufacturing or quality control, temperature-corrected density tables are used. For home cooking, the room-temperature value is always sufficient.

Alcoholic beverages present a more complex case because the density depends on both temperature and alcohol concentration. Hydrometers and refractometers measure the specific gravity (ratio of density to water) to determine alcohol content in brewing and winemaking.

Grams to mL in pharmaceutical and scientific contexts

In chemistry and pharmacy, grams and millilitres are converted constantly. The principle is identical to cooking: mL = g ÷ density.

For aqueous solutions (substances dissolved in water), the density is slightly higher than pure water because the dissolved solute adds mass without proportionally increasing volume. A saturated salt solution (about 350 g/L of NaCl) has a density of approximately 1.20 g/mL.

For organic solvents:

• Acetone: 0.791 g/mL
• Ethyl acetate: 0.902 g/mL
• Chloroform: 1.489 g/mL
• Diethyl ether: 0.706 g/mL

These values apply at room temperature (approximately 20°C). For precision work, always use the density at the measured temperature from a chemical reference.

Using grams instead of mL for recipe accuracy

Weighing ingredients in grams rather than measuring in mL is more accurate for cooking because:

No equipment needed beyond a scale: You do not need a measuring jug, cylinder, or cup. Add the ingredient directly to the bowl on the scale, tare to zero, add the next ingredient.

Faster: Pouring honey or thick syrup into a measuring cup and then transferring it loses residue on the sides. Weighing on the scale and pouring directly wastes nothing.

Temperature independent: A gram is a gram regardless of temperature. A millilitre of honey at 40°C occupies slightly more space than the same honey at 20°C because warm liquids expand.

For baking recipes with liquids, convert mL amounts to grams using the density: grams = mL × density. Write the gram equivalent next to each liquid ingredient in the recipe.

Practical examples for common conversions

The last example is relevant for purchasing: a 1-litre bottle of olive oil weighs approximately 915 g, not 1 kg. This is why olive oil sold by volume (litres) and by weight (kg) are priced differently per unit.

Accuracy and best practices for cooking measurements

For baked goods where small errors change results, weigh your ingredients rather than measuring by volume. A digital kitchen scale accurate to 1 g is the most reliable approach.

For measuring by volume: Use the correct cup standard for your recipe’s country of origin. Spoon ingredients into the cup rather than scooping. Level off with a straight edge. Read liquids at eye level with the measuring cup on a flat surface.

For measuring by weight: Tare (zero) the scale with the bowl on it. Add each ingredient directly to the bowl. Tare again between ingredients to add them one at a time without emptying the bowl.

Ingredient freshness: Old flour that has absorbed moisture weighs slightly more than fresh flour at the same volume. Weighing is unaffected by moisture absorption. Cup measurements become slightly off as dry ingredients age and their density changes.

Converting recipe quantities for different batch sizes

When scaling a recipe up or down, converting all measurements to grams first makes the scaling arithmetic much simpler.

Step 1: Convert every ingredient to grams using the appropriate conversion. Step 2: Multiply every gram value by the scale factor (e.g. 2 for double batch, 0.5 for half batch). Step 3: Convert back to your preferred units if needed.

This approach avoids fractional cup values like “2.67 cups” that are hard to measure. Instead you get a gram weight that can be measured directly on a scale.

For large-scale batch cooking (catering, meal prep services), all recipes are specified in grams or kilograms. Volume measurements become impractical at scale because a 100-cup batch cannot be measured accurately in individual cup scoops.

Ingredient substitutions and weight equivalents

When substituting one ingredient for another, weight equivalents are more reliable than volume equivalents. Different forms of the same ingredient have different densities.

Flour substitutions:

• 1 cup all-purpose flour (125 g): substitute 1 cup + 2 tbsp cake flour (130 g) for a lighter texture, or use the gram weight for precision
• 1 cup all-purpose flour (125 g): substitute 95 g almond flour + 10 g arrowroot for a grain-free alternative

Sugar substitutions:

• 200 g white sugar: substitute 170 g honey (reduce other liquids by 30 mL) or 160 g maple syrup
• Liquid sweeteners are denser than granulated sugar, so volume measurements give incorrect ratios

Fat substitutions:

• 113 g butter (1/2 cup): substitute 95 mL vegetable oil (3/4 the volume, same mass of fat)
• Coconut oil is slightly less dense than butter; use the same gram weight, not the same cup amount

In every substitution case, using gram weights rather than cup volumes gives the correct ratio of the functional ingredient (fat, sugar, protein) regardless of the physical form.

Altitude adjustments in baking

At high altitudes (above 3000 feet / 900 m), leavening gases expand more rapidly. Standard recipes need adjustment. These adjustments are small and best expressed in grams or millilitres.

General high-altitude guidelines for baked goods:

• Reduce baking powder by 1/4 to 1/2 teaspoon per teaspoon called for
• Increase liquid by 2-4 tablespoons per cup (30-60 mL)
• Increase flour by 1-2 tablespoons per cup (8-16 g of all-purpose flour)
• Reduce sugar by 1-2 tablespoons per cup (12-25 g)

These adjustments are most reliable when expressed in grams because the percentage change relative to total weight is what matters physically. Adding “2 tablespoons of flour” means different things at different altitudes if the original cup was scooped vs spooned.

Ingredient substitutions and weight equivalents

When substituting one ingredient for another, weight equivalents are more reliable than volume equivalents. Different forms of the same ingredient have different densities, so volume measurements create wrong ratios.

Flour substitutions by weight: Replacing all-purpose flour with almond flour in equal gram amounts keeps the structural ratio correct. Volume substitution fails because almond flour is much less dense (96 g/cup vs 125 g/cup for all-purpose).

Liquid sweetener substitutions: When swapping honey for sugar, use gram equivalents and reduce other liquids by about 15% to compensate for the additional moisture honey brings. 200 g of sugar replaced by 175 g of honey is a commonly used ratio.

Oil and butter equivalence: Butter is approximately 80% fat. 113 g butter (1/2 cup) contains about 90 g of fat. Replacing with oil: use 90 g (about 98 mL) of pure oil. Volume substitution of 1/2 cup butter for 1/2 cup oil gives too much fat because butter contains water and milk solids that oil does not.

In every substitution, weight-based conversion gives the correct functional ratio. Volume-based substitution introduces errors from density differences between ingredients.

Using these conversions for nutritional tracking

Tracking food intake for health, fitness, or medical purposes requires accurate weight measurements. Most nutrition databases list macronutrients per 100 g of a food. Converting the amount you actually used (in tablespoons, teaspoons, or mL) to grams lets you look up the accurate nutritional content.

For cooking oils, a recipe might say “2 tablespoons of olive oil.” Converting: 2 tablespoons × 14.787 mL/tbsp × 0.915 g/mL = 27.1 g. Looking up 27 g of olive oil in a nutrition database gives accurate calorie and fat content for that dish.

For sweeteners, “1 tablespoon of honey” = approximately 21.25 g. At 3 kcal/g for carbohydrates, and honey being about 80% carbohydrates by weight: 21.25 × 0.80 × 4 = 68 kcal per tablespoon. The standard nutrition label value for honey is 64-68 kcal per tablespoon, confirming this calculation.

Accurate gram weights also matter for sodium tracking. A teaspoon of table salt = 5.69 g × 39.3% sodium = 2.24 g sodium = 2240 mg. Dietary guidelines recommend under 2300 mg sodium per day, so one teaspoon of salt is essentially the entire daily allowance.