Gr to Ml

Volumetric Mass Metrology & USP Compounding Standards

For pure water at 4^, the metric system was intentionally designed so that 1 milliliter (1 cm^3) has a mass of exactly 1 gram.

Primary Substance Densities

• Pure Water: 1.000 g/mL 1 g = 1.00 mL

• Whole Milk: 1.030 g/mL 100 g = 97.09 mL

• Olive / Cooking Oil: 0.920 g/mL 100 g = 108.70 mL

• Medication Syrup / Glycerin: 1.260 g/mL 100 g = 79.37 mL

• Honey: 1.420 g/mL 100 g = 70.42 mL

• 1 Apothecary Grain (gr): 64.79891 mg = 0.064799 g

Equations

• Volume (mL) = Mass (g)Density

• Mass (g) = Volume (mL) × Density

How to Use This Calculator

Enter your Mass / Volume Amount to Convert (e.g. 100.0), Mass Unit Standard — choose from Grams (g - Metric Standard), Grains (gr - Apothecary: 1 gr = 64.799 mg), Substance & Liquid Density — choose from Pure Water (1.000 g/mL), Whole Milk (1.030 g/mL), Cooking / Olive Oil (0.920 g/mL), and Conversion Direction — choose from Mass to Milliliters (g/gr → mL), Milliliters to Mass (mL → g/gr). Results update instantly as you type — adjust any value to compare scenarios.

The Formula

Formula Reference: Gr to Ml

Input variables:

amountValue — Mass / Volume Amount to Convert

unitTypeSelect — Mass Unit Standard

ingredientSelect — Substance & Liquid Density

conversionDirectionSelect — Conversion Direction

Computed outputs:

convertedAmount — Converted Amount

equivalentMilliliters — Volume in Milliliters (mL)

equivalentGrams — Mass in Grams (g)

equivalentTeaspoons — Volume in Teaspoons (tsp)

equivalentTablespoons — Volume in Tablespoons (Tbsp)

Mathematical relationships extracted from calculation logic:

grainToGram = 0.06479891; // 1 grain = 64.79891 mg

g = val * grainToGram

Reference constants:

grainToGram = 0.06479891

Standard: NIST Handbook 44 and BIPM SI unit definitions

Worked Example

Measuring 100 grams of pure water into a graduated cylinder yields exactly 100.00 mL (3.38 fluid ounces) of liquid.

Understanding Your Result

Unit conversion precision: round to the same number of significant figures as your original measurement. Converting 6 feet to meters gives 1.8288 m — but if your measurement was approximate (±1 inch), expressing more than 2 decimal places is false precision. For international trade and technical specifications, SI units (meters, kilograms, liters) are the standard. US customary units (feet, pounds, gallons) differ from Imperial UK units: 1 US gallon = 3.785 L vs. 1 UK gallon = 4.546 L.