What can this concentration calculator do?

It computes molarity (M), required solute mass for a target M and volume, or required solution volume for a given amount and target M. It also converts between M and w/w%, w/v%, and ppm (approximate, density-dependent).

Do I need the molar mass?

Yes, when using mass-based inputs or conversions, the molar mass (MW, g·mol−1) is required to convert between mass and moles.

Are the conversions exact?

They’re practical approximations assuming 25 °C and ideal mixing. For w/w% and ppm, density matters; the tool lets you supply solution density when needed.

Concentration Calculator | Find Molarity, Mass, or Volume Instantly

Enter data

I want to calculate:

Molarity, M (from solute + volume)

Mass of solute for target M & volume

Solution volume for target M & solute

Molar mass, MW (g·mol⁻¹)

Solute amount (use either line):

If both given, moles takes priority. Otherwise we use mass/MW.

Solution volume

Options:

Show steps

Round to sensible significant figures

Quick picks:

Chips prefill values and auto-calculate.

Result:

No results yet. Enter inputs and click Calculate.

Advanced: Convert between concentration types

Conversion:

M ↔ w/w %

M ↔ w/v %

M ↔ ppm (mass)

Direction:

Left → Right

Right → Left

Molarity, M (mol·L⁻¹):

Molar mass, MW (g·mol⁻¹):

Solution density, ρ (g·mL⁻¹):

Default ρ = 1.000 for dilute aqueous solutions (edit if needed).

w/w % (g solute per 100 g solution):

w/v % (g solute per 100 mL solution):

ppm (mg solute per kg solution):

Conversion result:

Choose conversion, fill inputs, then click Convert.

Approximations assume 25 °C, ideal mixing; w/v % is a common lab shorthand. For concentrated or non-aqueous solutions, provide ρ.

Concentration Calculator

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Formula & Equations Used