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Molarity Calculator

Calculate molarity, mass, volume, or moles from solution concentration values using M = moles / liters.

Choose the missing value to calculate.

Solute mass in grams.

Molar mass in grams per mole.

Solution volume in liters.

Concentration in moles per liter.

Amount of substance in moles. Optional when mass and molar mass are known.

Status: initial

Results

Awaiting calculation

Chemistry math

Introduction

The Molarity Calculator helps students, teachers, and lab users calculate molarity, mass, volume, or moles from common solution chemistry values.

The core formula is M = n / V, where M is molarity, n is moles of solute, and V is solution volume in liters. If mass and molar mass are known, moles equal mass divided by molar mass.

Formula and method guide

Molarity

M = moles / liters

Use this when moles and solution volume are known.

Moles from mass

Moles = mass / molar mass

Use this when the amount is entered as mass instead of moles.

Mass required

Mass = molarity x volume x molar mass

Use this to estimate the grams needed for a target concentration and volume.

Variables

Molarity

Concentration measured as moles per liter.

Mass

Solute mass, entered in grams.

Molar mass

Mass of one mole of the substance, in grams per mole.

Volume

Total solution volume, entered in liters.

Moles

Amount of substance in moles.

FAQs

What does this Molarity Calculator calculate?
It calculates molarity, mass, volume, or moles from common solution chemistry inputs.
What is the molarity formula?
Molarity equals moles of solute divided by liters of total solution.
What unit is molarity measured in?
Molarity is measured in mol/L and is commonly written as M.
How do I calculate moles from mass?
Divide mass in grams by molar mass in grams per mole.
How do I calculate mass for a target molarity?
Multiply molarity by volume in liters and molar mass.
Can this calculate volume?
Yes. It calculates volume by dividing moles by molarity.
Can I enter moles directly?
Yes. Entering moles can be useful when the amount of substance is already known.
Does this support milliliters?
The current calculator uses liters. Convert milliliters to liters by dividing by 1,000.
Does this support grams?
Yes. Mass is entered in grams and molar mass is entered in grams per mole.
Is molarity the same as molality?
No. Molarity uses liters of solution, while molality uses kilograms of solvent.
Does temperature matter?
Temperature can affect volume and real lab preparation, but this calculator uses the entered values only.
Does this account for purity?
No. Adjusting for purity or hydrate form requires additional chemistry context.
Can this be used for lab safety decisions?
No. It is educational math and should not replace lab protocols or safety data sheets.
Why is molar mass required for mass calculations?
Molar mass converts between grams and moles, which are required for molarity.
What is 1 M?
A 1 M solution contains 1 mole of solute per liter of total solution.

References

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