FREE QUALITY TOOL
W/V Calculator – Weight/Volume Percentage
% w/v = grams ÷ mL × 100
% w/v = grams ÷ mL × 100Keep units consistent. Record assumptions and independently verify critical results.
The result updates as valid values are entered.
Common questions about % w/v
What does 1% w/v mean?+
It means 1 gram of solute in 100 mL of final solution. The volume refers to the complete solution, not 100 mL of solvent added to the solute.
How do I convert % w/v to mg/mL?+
Multiply the numerical percentage by 10 to get mg/mL. For example, 0.9% w/v is 9 mg/mL, and 1% w/v is 10 mg/mL. Divide mg/mL by 10 to convert back to % w/v.
What is the difference between w/v and w/w?+
Weight/volume percentage uses grams of solute per 100 mL of final solution. Weight/weight percentage uses grams of solute per 100 g of final solution. They are not interchangeable; converting between them requires the solution density.
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Percentage v/v calculator
Calculate volume/volume percentage when both the solute amount and final solution amount are measured as volumes.
CALCULATION GUIDE
Understand your calculation
Clear inputs, a practical example and the context you need to interpret your result.
How it works
Percent w/v means grams of solute in 100 mL of final solution. Find concentration using % w/v = mass (g) ÷ final volume (mL) × 100. To find required mass, use mass (g) = target % w/v × final volume (mL) ÷ 100.
Inputs and units
Choose a calculation mode. Enter a nonnegative solute mass or target percentage and a positive final solution volume. Select units explicitly. Required mass is reported in grams. Use final solution volume, not the starting solvent volume.
Worked example
900 mg = 0.9 g. For 100 mL final solution: 0.9 ÷ 100 × 100 = 0.9000% w/v. Equivalently, 9 g in 1 L gives 0.9000%. In required-mass mode, a target of 0.9% w/v and final volume of 500 mL gives 4.5 g of solute.
Interpreting the result
A 0.9% w/v solution contains 0.9 g per 100 mL, equivalent to 9 mg/mL.
Assumptions and limitations
This is not percent w/w. The tool does not account for purity, hydration, solubility or volume changes during preparation. Displayed decimal places do not establish measurement accuracy.