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Milliliters to Milligrams Calculator

Convert milliliters (mL) to milligrams (mg) using density (g/mL). Enter volume, choose a preset substance or custom value, and get precise mg for dosing, cooking, and lab work.

Convert Milliliters to Milligrams

Volume (Milliliters)
Substance
Density (g/mL)

Density of Water: 1.0 g/mL

Conversion Result

10,000
milligrams (mg)

Conversion Details

Volume
10 mL
10 mL
Substance
Water
Water
Density
1 g/mL
1 g/mL

Common Substance Densities

Water1 g/mL

Pure water at 4°C

Milk1.03 g/mL

Whole milk

Oil0.92 g/mL

Vegetable oil

Honey1.42 g/mL

Natural honey

Alcohol0.79 g/mL

Ethanol

Glycerin1.26 g/mL

Glycerol

Mercury13.6 g/mL

Liquid mercury

How to Convert Milliliters to Milligrams

Conversion Formula

Formula: Milligrams = Milliliters × Density (g/mL) × 1000 (mg/g)
Example: 10 mL of water = 10 × 1.0 × 1000 = 10,000 mg

Conversion Steps:

  1. 1
    Identify the substance
    Determine what material you're converting
  2. 2
    Find the density
    Look up the density of the substance in g/mL
  3. 3
    Apply the formula
    Multiply volume by density and convert to milligrams

Important Considerations

⚠️ Accuracy Warning

Density values can vary with temperature, pressure, and purity. Use precise measurements for critical applications.

🌡️ Temperature Effects

Density changes with temperature

  • • Most substances expand when heated
  • • Use density at same temperature
  • • Water is densest at 4°C
🧪 Purity Matters

Impurities affect density

  • • Pure substances have known densities
  • • Mixtures have variable densities
  • • Check purity before conversion
📏 Measurement Precision

Use appropriate precision

  • • Match precision to application
  • • Round final results appropriately
  • • Consider significant figures
⚠️ Safety Considerations

Handle substances safely

  • • Use proper safety equipment
  • • Check material safety data
  • • Follow handling procedures

Example Cases

Case 1: Water Conversion

Input: 15 mL of water
Density: 1.0 g/mL
Temperature: 4°C (standard)
Calculation: 15 × 1.0 × 1000
Result: 15,000 mg
Application: Medication dosing

Use Case: Converting liquid medication volume to mass for precise dosing calculations.

Case 2: Oil Conversion

Input: 5 mL of vegetable oil
Density: 0.92 g/mL
Temperature: Room temperature
Calculation: 5 × 0.92 × 1000
Result: 4,600 mg
Application: Cooking measurements

Use Case: Converting cooking oil volume to weight for nutritional analysis and recipe scaling.

Frequently Asked Questions

What is milliliters to milligrams conversion?
Milliliters to milligrams conversion is the process of converting volume (mL) to mass (mg) using the density of a substance. Since milliliters measure volume and milligrams measure mass, you need the substance's density to perform the conversion accurately.
Why do I need density for the conversion?
Density is required because different substances have different masses per unit volume. For example, 1 mL of water weighs 1000 mg, but 1 mL of oil weighs only 920 mg. The density tells us how much mass is contained in each milliliter of the substance.
How accurate is this conversion calculator?
This calculator provides accurate results based on the density values you input. The accuracy depends on the precision of the density value used. For common substances, we provide standard density values, but actual density can vary slightly with temperature and purity.
What are common substance densities?
Common densities include: Water (1.0 g/mL), Milk (1.03 g/mL), Oil (0.92 g/mL), Honey (1.42 g/mL), Alcohol (0.79 g/mL), and Mercury (13.6 g/mL). These values are at standard temperature and pressure conditions.
Does temperature affect density?
Yes, temperature significantly affects density. Most substances expand when heated and contract when cooled, changing their density. For precise conversions, use density values measured at the same temperature as your substance.

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