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The Tm value reported on our spec sheets uses a 25 µM oligonucleotide and a 50 mM salt concentration. It does not take into account dNTP or Mg2+ concentrations.
To get an accurate Tm for your specific application, all of these concentrations should be entered and adjusted to match the reaction conditions you plan to use.
The free IDT OligoAnalyzer™ calculates Tm for the concentrations you input.