Percent Concentration Calculator

Last updated: June 2026

Concentration type

Find

Solute amount

Solution amount

Concentration

Formula

w/v% = mass / volume x 100. w/w% = mass solute / mass solution x 100. v/v% = volume solute / total volume x 100.

About this calculator

The Percent Concentration Calculator works with weight/volume, weight/weight, and volume/volume percentages. It is useful for classroom solution problems, dilution planning examples, and comparing concentration labels.

Percent concentration formulas

Percent concentration expresses solute amount per 100 units of solution amount. The units depend on whether the concentration is w/v, w/w, or v/v.

w/v% = mass solute / volume solution x 100
w/w% = mass solute / mass solution x 100
v/v% = volume solute / total volume x 100

How to use the percent concentration calculator

Choose w/v, w/w, or v/v concentration.
Choose whether to calculate concentration, solute, or solution amount.
Enter the two known values.
Check the units shown beside each input.
Review the result and formula.
Use lab instructions for real solution preparation.

Worked examples

w/v solution

Input: 5 g solute in 100 ml solution

Calculation: 5 / 100 x 100

Result: 5% w/v

v/v solution

Input: 25 ml solute in 250 ml total solution

Calculation: 25 / 250 x 100

Result: 10% v/v

Choosing the right concentration type

Use w/v for grams per 100 ml, w/w for grams per 100 g, and v/v for millilitres per 100 ml.

Solute vs solution amount

The denominator is the final solution amount, not always the starting solvent amount.

Educational solution note

This calculator is for educational use. Real solutions can need density corrections, purity corrections, temperature control, safety checks, and lab supervision.

Frequently asked questions

What is w/v percent?

It means grams of solute per 100 ml of solution.

What is w/w percent?

It means grams of solute per 100 g of solution.

What is v/v percent?

It means millilitres of solute per 100 ml of solution.

Is solvent volume the same as final solution volume?

Not always. Use final solution volume for concentration.

Can I use this for lab safety decisions?

No. Follow lab procedures and supervisor guidance.

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What does this mean?

This calculator is designed to help you understand the likely number before you make a decision or start an application.

Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.

Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.