What is a dihedral angle in protein structure?

A dihedral angle in protein structure is the angle between four consecutive atoms, most commonly the phi (φ) and psi (ψ) angles that define the backbone conformation of amino acids in proteins.

How do I calculate dihedral angles from PDB files?

Upload your PDB file to our calculator, select analysis options, and click 'Start Calculation'. The tool automatically extracts atomic coordinates and computes all phi and psi angles for each residue.

What is a Ramachandran plot?

A Ramachandran plot is a graph showing the distribution of phi and psi angles in protein structures, used to validate protein geometry and identify secondary structure elements like alpha helices and beta sheets.

Can I export calculation results?

Yes, results can be exported in multiple formats including CSV, PDF, and TXT. The tool also generates publication-ready Ramachandran plots in high resolution.

Is the PDB Angle Calculator free to use?

Yes, our PDB Angle Calculator is completely free for academic and research use. No registration required, and all calculations are performed instantly online.

PDB Angle Calculator - Advanced Protein Structure Analysis

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PDB Code	Chain ID	Residue	Residue ID	Phi (°)	Psi (°)

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