What is a dilution factor?

The dilution factor is the ratio of the final volume to the initial (stock) volume taken. A 1:10 dilution means 1 part stock in 10 parts total, giving a dilution factor of 10 and reducing the concentration to 1/10 of the original.

How is serial dilution different from a single dilution?

A serial dilution applies the same dilution factor repeatedly. Each step uses the diluted product of the previous step as the new stock. After n steps with factor DF, the total dilution factor is DF^n and the final concentration is C_stock / DF^n.

What volume of stock do I need for a single dilution?

V_stock = V_final / DF. For example, a 1:20 dilution into 1 mL total needs 1000 µL / 20 = 50 µL of stock, topped up with 950 µL of diluent.

Why does my serial dilution table show small volumes?

High dilution factors with small final volumes produce very small stock aliquots. If the stock volume is below a pipettable amount (< 1 µL), reduce the final volume per step or use a larger intermediate dilution.

Can I use this for percent concentration?

Yes. Select "%" as the unit. The dilution factor math is the same — only the display unit changes. For example, a 70% stock diluted 1:7 gives a 10% working solution.

What does a dilution factor of 5 mean?

A dilution factor of 5 (written 1:5) means the final solution is 5 times more dilute than the stock — 1 part stock plus 4 parts diluent for 5 parts total. The concentration drops to 1/5 (20%) of the original.

Dilution Factor Calculator

Name: Dilution Factor Calculator
Availability: InStock
Author: Nham Vu

Calculate dilution factors, final concentrations, and volumes for single or serial dilutions in lab settings.

Dilution Factor Calculator

Calculate dilution factors and volumes for single or serial dilutions.

Mode

Stock Concentration (C1)

Final Volume per Step

Solve For

Dilution Factor (1 : X)

1 :

Quick Examples

Enter values and press Calculate

Serial Dilution Table

Step	Total DF	Stock Vol	Diluent Vol	Concentration

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Summary

Calculate dilution factors, final concentrations, and volumes for single or serial dilutions in lab settings.

How it works

Enter the stock concentration and its unit (M, mM, µM, nM, or %).
Choose a mode: single dilution or serial dilution.
For single dilution: enter the final volume and either the dilution factor or desired final concentration.
For serial dilution: enter the dilution factor per step and number of steps.
The calculator shows volumes to add, total volume at each step, and the concentration after each dilution.
Copy the full dilution table to your clipboard for use in lab notebooks.

Use cases

Preparing working solutions from a concentrated stock in molecular biology.
Setting up 10-fold or 2-fold serial dilutions for standard curves.
Calculating how much diluent to add to reach a target concentration.
Designing dilution series for ELISA, qPCR, or cell-based assays.
Teaching lab students to understand dilution ratios and concentration math.
Verifying dilution schemes before performing expensive reagent preparations.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu