Percent Solution Calculator
Toggle between finding percent concentration from measured amounts or calculating how much component is needed for a target percent solution.
Percent solution
2 % w/v
How to Use This Calculator
Choose calculation direction
Switch between finding the percent of a solution or the amount needed for a target percent.
Select percent type
Pick w/v, w/w, or v/v depending on whether your components are measured by mass or volume.
Enter known quantities
Provide component and total amounts or desired percent and batch size.
Apply the output
Use the computed percent for reporting or weigh out the calculated component to prepare the solution.
Formula
Percent = (component / total) × 100
Component = (percent / 100) × total
Plug in masses for w/w, grams and milliliters for w/v, or volumes for v/v solutions. Units cancel as long as they are consistent.
Example
To make 500 mL of a 2% w/v solution, add 0.02 × 500 = 10 g of solute and fill to 500 mL with solvent.
Full Description
Percent solutions are widely used to specify concentrations in medicine, food science, and formulation. Whether expressed as w/v, w/w, or v/v, they describe how much component is present per 100 parts of solution.
This calculator streamlines conversions in both directions, helping you verify concentration labels or prepare batches accurately with minimal manual math.
Frequently Asked Questions
What is the difference between w/v and w/w?
w/v uses grams per 100 mL, common for aqueous solutions. w/w uses grams per 100 g, common in ointments or solid mixtures.
Can I mix units?
No. Keep component and total amounts in the same units to avoid errors.
How do I handle multiple components?
Compute the percent for each component relative to the total mass or volume. Ensure the sum of all components matches the total.
Does temperature change the percent?
Mass-based percents are temperature independent. Volume-based percents can vary slightly with temperature due to expansion/contraction.
Is percent the same as fraction?
Percent is the fraction multiplied by 100. Divide percent by 100 to recover the fraction.