Convert concentrations between mg/L, %, ppm, ppb, g/L, mg/mL, and g/100mL with w/v or w/w equivalents for aqueous solutions and show work.

Concentration Converter

Convert between mg/L, percent, ppm, and g/L with equivalents and work shown.

mg/L → %
% → mg/L
Any Unit

Converts to all common concentration units at once. Assumes aqueous solution (ρ ≈ 1.00 g/mL).

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1% w/v = 1 g per 100 mL = 10 g/L = 10,000 mg/L = 10,000 ppm (aqueous)

mg/L to Percent Formula

The following formula is used to convert a concentration in milligrams per liter into percent concentration on a weight/volume basis.

% = mg/L / 10,000

You can also reverse the conversion with the following relationship:

mg/L = % × 10,000

Variables:

  • % is the concentration expressed as percent weight/volume
  • mg/L is the concentration expressed in milligrams per liter

To calculate percent from mg/L, divide the mg/L value by 10,000.

What is mg/L to Percent Conversion?

Converting mg/L to percent changes a concentration from one scale to another. A value in mg/L tells you how many milligrams of a substance are present in one liter of solution. A percent weight/volume value tells you how many grams of a substance are present in 100 milliliters of solution. For dilute water-based solutions, these are directly related because 1% w/v equals 10,000 mg/L.

This means the conversion is a straightforward rescaling. Smaller mg/L values produce smaller percent values, while larger mg/L values produce larger percent values in the same proportion.

How to Convert mg/L to Percent?

The following steps outline how to convert mg/L to percent.

  1. First, determine the concentration in mg/L.
  2. Next, use the relationship that 1% w/v = 10,000 mg/L.
  3. Then divide the mg/L value by 10,000 to find the equivalent percent concentration.
  4. Finally, check your answer with the calculator above.

mg/L to Percent Conversion Table

The table below shows sample conversions using the formula % = mg/L ÷ 10,000.

Concentration (mg/L) Calculation Percent (% w/v)
100 100 ÷ 10,000 0.01%
250 250 ÷ 10,000 0.025%
500 500 ÷ 10,000 0.05%
1,000 1,000 ÷ 10,000 0.1%
10,000 10,000 ÷ 10,000 1%
50,000 50,000 ÷ 10,000 5%

Example Problem: 

Use the following values as an example problem to test your knowledge.

Concentration = 1,000 mg/L

Percent = 1,000 ÷ 10,000 = 0.1%

So, a concentration of 1,000 mg/L is equal to 0.1% w/v.