Concentration & Dilution Calculator
Molarity · Moles · Volume · C1V1 = C2V2 · Serial Dilutions
M = n / V
n = M × V
V = n / M
C1V1 = C2V2 → solve for V2
Molarity
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Grams of Solute —
Millimoles —
Volume (mL) —
Molarity vs. Volume (at current moles)
How much stock do I need?
Given a stock solution and desired final conditions, find the volume of stock to transfer and diluent to add.
Stock Volume to Transfer
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Diluent to Add —
Dilution Factor —
Step-by-Step Protocol
Serial Dilution Series
Each step applies the same dilution factor to the previous concentration.
| Step | Concentration (M) | Scientific Notation | Log₁₀(C) |
|---|
Log-Scale Dilution Series
How to Use This Calculator
- Select what you want to solve for using the Solve for dropdown, or switch tabs for the Dilution Planner and Serial Dilutions tools.
- Enter the known values — results and the chart update instantly.
- Use the preset chips to load a common scenario (1 M NaCl, HCl dilution, etc.).
- For grams, enter the molar mass — the calculator will convert moles to grams automatically.
- In the Dilution Planner, enter the stock concentration, target concentration, and final volume to get a step-by-step protocol.
How do you calculate molarity?
Molarity (M) = moles of solute ÷ liters of solution. For example, dissolving 0.5 mol of NaCl in 0.5 L of water gives a 1.0 M solution. To convert from grams, divide mass by molar mass first (moles = grams ÷ g/mol).