Molarity & Solution Calculator
Common Lab Solutions — Quick Reference
Grams of solute needed per liter for common molar solutions.
| Solute | MW (g/mol) | 1 M (g/L) | 0.1 M (g/L) |
|---|---|---|---|
| NaCl | 58.44 | 58.44 | 5.84 |
| KCl | 74.55 | 74.55 | 7.46 |
| NaOH | 40.00 | 40.00 | 4.00 |
| HCl (37%) | 36.46 | ~82 mL | ~8.2 mL |
| Glucose | 180.16 | 180.16 | 18.02 |
| Tris base | 121.14 | 121.14 | 12.11 |
| EDTA | 292.24 | 292.24 | 29.22 |
| CaCl₂ | 110.98 | 110.98 | 11.10 |
How We Calculate This
This molarity calculator uses established formulas and industry-standard data to provide accurate estimates.
- Enter your specific values into the calculator fields above
- Our algorithm applies the relevant formulas using your inputs
- Results are calculated instantly in your browser — nothing is sent to a server
- Review the detailed breakdown to understand how each factor affects your result
These calculations are estimates based on standard formulas. For critical decisions, always consult a qualified professional.
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Molarity (M) is the most common way to express solution concentration in chemistry. It measures the number of moles of solute per liter of solution.
The basic rule:
- Molarity (M) = Moles of solute / Volume in liters
- Moles = Mass (g) / Molecular Weight (g/mol)
- To find mass needed: Mass = Molarity × Volume (L) × Molecular Weight
- A 1 M solution of NaCl (MW 58.44) means 58.44 g dissolved in 1 liter of solution
Remember that molarity is based on liters of solution, not liters of solvent. When preparing solutions, dissolve the solute first, then add solvent to reach the desired final volume.
When Would You Use This Calculator?
This molarity calculator is designed for anyone who needs quick, reliable estimates without complex spreadsheets or professional consultations.
- When you need a quick estimate before committing to a purchase or project
- When comparing different options or scenarios side by side
- When planning a budget and need to understand potential costs
- When you want to verify a quote or estimate you've received from a professional
- When teaching or learning about the concepts behind these calculations
Frequently Asked Questions
What is molarity?
Molarity (M) is concentration measured in moles per liter (mol/L). A 1 M solution contains 1 mole of solute in 1 liter of total solution. It's the standard concentration unit in chemistry labs.
How do I prepare a molar solution?
Calculate the mass needed: Mass = Molarity × Volume (L) × Molecular Weight. Weigh the solute, dissolve it in less than the final volume of solvent, then add solvent to reach the exact final volume in a volumetric flask.
What is the difference between molarity and molality?
Molarity (M) is moles per liter of solution. Molality (m) is moles per kilogram of solvent. Molality doesn't change with temperature since it's based on mass, not volume. Molarity is more common in lab work.
How do I convert between molarity and percent concentration?
For weight/volume percent: %(w/v) = Molarity × Molecular Weight / 10. For example, 1 M NaCl (MW 58.44) = 5.844% w/v. This approximation works well for dilute aqueous solutions.
Where do I find molecular weight?
Molecular weight (formula weight) is on the reagent bottle label, safety data sheet (SDS), or can be calculated from the molecular formula using atomic weights from the periodic table.