Dilution Factor Calculator

Enter your Stock Concentration, Final Concentration, and Final Volume into the Dilution Factor Calculator to find your Dilution Factor, Dilution Ratio, Volume of Diluent to Add, and step-by-step Preparation Instructions.

Results

Dilution Factor

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Dilution Ratio

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Volume of Diluent to Add

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Preparation Instructions

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Solution Composition

Frequently Asked Questions

What is a dilution factor?

The dilution factor is the ratio that describes how much a stock solution has been diluted. It can be expressed as the ratio of stock concentration to final concentration, or as the ratio of final volume to initial volume taken from stock.

How do I calculate the dilution factor?

Dilution factor = Stock concentration ÷ Final concentration. Alternatively, it equals Final volume ÷ Volume from stock. For example, diluting 100 mM to 10 mM gives a dilution factor of 10x.

What's the difference between dilution factor and dilution ratio?

Dilution factor is typically expressed as a single number (like 10x), while dilution ratio shows the relationship as parts (like 1:10). A 10x dilution factor corresponds to a 1:10 dilution ratio.

What does a 1:20 dilution factor mean?

A 1:20 dilution means you take 1 part of stock solution and add 19 parts of diluent to make 20 parts total. This creates a 20x dilution factor, reducing the concentration to 1/20th of the original.

How do I dilute a solution by a factor of 10?

To make a 10x dilution, take 1 part stock solution and add 9 parts diluent. For example, mix 1 mL of stock with 9 mL of diluent to get 10 mL of solution at 1/10th the original concentration.

Can I use different units for volumes and concentrations?

Yes, this calculator allows you to select different units for volumes (from femtoliters to liters) and concentrations (from femtomolar to molar, plus percentages). The calculator automatically handles unit conversions.

What is the volume of diluent I need to add?

Volume of diluent = Final volume - Volume from stock. This is the amount of solvent (usually water or buffer) you need to add to your stock aliquot to reach the desired final volume.

How accurate should my dilution measurements be?

Accuracy depends on your application. For routine work, measuring to the nearest 0.1 mL may suffice, but for precise analytical work, you may need to measure to 0.01 mL or better using calibrated pipettes.

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