Thermo Fisher Scientific Temperature Calculator

Calculate DNA/RNA melting temperature (Tm) using Thermo Fisher Scientific's nearest-neighbor method with detailed parameters.

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About This Tool

This TM Calculator implements the nearest-neighbor method used by Thermo Fisher Scientific to accurately calculate the melting temperature (Tm) of DNA or RNA sequences. Enter your sequence, oligo concentration, salt concentration, and optional parameters like formamide concentration to get precise Tm values for primer design and molecular biology applications. The tool validates input sequences and provides detailed results with all calculation parameters displayed.

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How to Use

Enter your DNA or RNA sequence in the text area (ACGTU characters only).
Set the oligo concentration in nM (default:
.
Set the salt concentration in mM (default:
.
Optionally adjust formamide concentration (%) and choose DNA or RNA type.
Click 'Calculate Tm' to compute the melting temperature.
View results including Tm value and all calculation parameters.

Frequently Asked Questions

Find Quick Answers

What method does this TM calculator use?

This calculator uses the nearest-neighbor method with thermodynamic parameters, similar to Thermo Fisher Scientific's tools, which provides accurate Tm values for DNA and RNA sequences.

What sequence characters are allowed?

For DNA: A, C, G, T (case insensitive). For RNA: A, C, G, U (case insensitive). The tool automatically validates and cleans the input.

What is the default salt concentration and why does it matter?

Default salt concentration is 50 mM. Salt concentration affects Tm because cations stabilize DNA duplexes - higher salt concentrations increase Tm values.

Can I calculate Tm for RNA sequences?

Yes, simply select 'RNA' from the sequence type dropdown. The calculator uses appropriate thermodynamic parameters for RNA.

What is the formamide concentration parameter for?

Formamide is a denaturant that lowers Tm. If you're performing experiments with formamide, enter the percentage to get accurate Tm values under those conditions.

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