How to Use the Drug Concentration Converter
Medication, IV fluid, and disinfectant concentrations get expressed in several different units. %(w/v) stands for "weight/volume" and represents the weight, in grams, of solute dissolved in 100mL of solution - 0.9% (w/v) saline is a common example. mg/mL and ug/mL express the mass of solute per 1mL of volume in milligrams or micrograms, while ppm (parts per million) represents a ratio of one part per million, and for dilute aqueous solutions (assuming a density of 1) it's treated as numerically equal to ug/mL.
The conversion ratios between these four units are fixed. Since 1% (w/v) = 1g/100mL = 10mg/mL, you convert between % and mg/mL by multiplying or dividing by 10. 1mg/mL equals 1,000ug/mL, which also equals 1,000ppm. For example, 0.9% saline is equivalent to 9mg/mL, 9,000ug/mL, and 9,000ppm - all the same concentration expressed differently.
Enter a value, choose a unit, and %(w/v), mg/mL, ug/mL, and ppm are all calculated at once. Useful for checking dilution ratios during compounding or comparing concentrations when disinfectant or IV fluid labels use different units. Always follow a licensed healthcare professional's prescription and verification for actual dosing or compounding.
Frequently Asked Questions
%(w/v) stands for 'weight/volume' and represents the weight (in grams) of solute dissolved in 100mL of solution. For example, 0.9% (w/v) saline means 0.9g of sodium chloride dissolved in 100mL of water.
1% (w/v) equals 10 mg/mL. The math: 1% = 1g/100mL = 1,000mg/100mL = 10mg/mL. This ratio is constant, so you can quickly convert between % and mg/mL by multiplying or dividing by 10.