How to Use the PCR Master Mix Calculator
Step 1: Enter your total reaction volume (typically 25µL or 50µL) and the number of reactions you need to prepare.
Step 2: Adjust the volumes for each reagent per reaction. Default values follow standard Taq polymerase protocol. Change them to match your specific polymerase kit instructions.
Step 3: Select extra volume buffer. Adding 10% extra is strongly recommended to account for pipetting loss.
Step 4: Click Calculate. The tool shows the complete master mix recipe for the total number of reactions plus individual per-reaction volumes.
Standard PCR Master Mix Protocol
A PCR master mix combines all common reagents except template DNA. This reduces pipetting errors and saves time when setting up multiple reactions.
10X Buffer = 2.5 µL
dNTPs (10mM each) = 0.5 µL
Forward Primer 10µM = 1.0 µL
Reverse Primer 10µM = 1.0 µL
Taq Polymerase = 0.25 µL
Template DNA = 1.0 µL
Nuclease-free H₂O = 18.75 µL
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Total = 25.0 µL
Why Use a Master Mix?
When running many reactions, mixing all reagents except template and primers in a single tube first reduces the number of pipetting steps. This lowers the risk of contamination and improves consistency across all reactions.