Molarity Volume Calculator

This molarity volume calculator finds the volume of solution needed for a given amount of solute at a target molarity. Enter the moles of solute and target molarity to find the required volume. Use it for solution preparation and volumetric flask sizing.

Formula

V = moles / molarity

1 Moles of Solute

2 Target Molarity

Live Preview

Moles of Solute

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Target Molarity

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Volume (L)

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How It Works

Moles of Solute

Enter value

Target Molarity

Enter value

Volume (L)

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What is Molarity Volume Calculation?

Molarity volume calculation determines how much solution volume is needed to achieve a specific molarity with a known amount of solute. It rearranges the molarity formula to solve for volume.

The formula: V = moles ÷ molarity. This tells you the exact volume of solution to prepare in a volumetric flask.

This is commonly used when you have a fixed amount of costly reagent and need to determine what volume to dissolve it in to reach your target concentration.

Volume (L) = moles of solute ÷ molarity (M)

Visual Concept

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Volume Calculation

Concentration measured in moles per liter (mol/L)

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Unit: M (Molar)

1 M = 1 mol of solute per 1 liter of solution

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Key Relationship

Molarity = Moles of Solute ÷ Volume of Solution

Molarity Volume Formula

The formula for calculating molarity from volume:

molarity = moles of solute ÷ volume of solution (L)

To use this formula, you need molarity and moles. The calculator handles all unit conversions automatically.

Enter your values below to see the molarity volume formula in action.

mass ÷ volume = concentration = molarity × molar mass

Where mass is in grams (g), volume is in liters (L), and molar mass is in g/mol.

Formula Breakdown

V = n / M

Volume required (L)

Moles of solute (mol)

Desired molarity (mol/L)

💡 Calculate the volume needed for a desired concentration

How to Calculate Molarity Volume

Follow these steps to calculate molarity from volume:

Identify the volume of your solute and gather all known values.
Find the molar mass of the substance from the periodic table or a chemical database.
Enter your volume value and select the appropriate unit from the dropdown.
Enter the volume of the solution in liters (L) or select another volume unit.
Click Calculate to get the molarity result instantly.
Verify the result using the step-by-step breakdown provided by the calculator.

Step-by-Step Process

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Set Target M

Decide desired molarity

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Know Moles

Determine moles of solute available

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Calculate V

V = n ÷ M (volume = moles / molarity)

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Convert Units

Convert L to mL if needed (× 1000)

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Prepare

Dissolve solute in calculated volume

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Done

Volume of solution determined

Molarity Volume Calculator Examples

The examples below show how to use the molarity volume calculator in practice.

Example 1: What volume of 0.5 M HCl contains 0.1 mol? V = n / M = 0.1 / 0.5 = 0.2 L = 200 mL.

Example 2: Using the formula: molarity = moles ÷ volume, compute the result and verify with the calculator above.

Example 3: Enter your own values into the calculator to see personalized step-by-step results.

Worked Example Example: Finding Volume

Moles 0.1 mol

Molarity 0.5 M

Volume 200 mL

Molarity Calculator Tools

Explore our collection of 20 specialized molarity calculators. Each tool is designed for a specific type of calculation with its own unique input fields and formulas.

FAQs

How do you calculate volume from molarity?

Volume = moles of solute ÷ molarity. Rearrange M = n/V to V = n/M.

What volume of 0.5 M HCl contains 0.1 mol?

V = n / M = 0.1 / 0.5 = 0.2 L = 200 mL.

Can I use milliliters?

Yes. The calculator supports mL, µL, L, and gallons. Select your unit from the dropdown.

What units does the Molarity Volume Calculator support?

The molarity volume calculator supports mass units (g, mg, µg, kg), volume units (L, mL, µL, gal), molar mass (g/mol, kg/mol), and molarity units (M, mM, µM, nM, pM, fM, aM).

Is the Molarity Volume Calculator free to use?

Yes. The molarity volume calculator is 100% free, requires no sign-up, and works on all devices. All calculations are performed instantly in your browser.