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Annealing Temperature Calculator

Estimate PCR annealing temperature from primer melting temperatures.

Enter both primer Tm values.

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How to use this calculator

Enter the melting temperature of each primer; the tool applies the Rychlik formula to suggest an annealing temperature.

Formula / method used

Ta = 0.3·Tm(primer) + 0.7·Tm(product) − 14.9

Frequently asked questions

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