Alpha Helix (Rotational Angle) Calculator

Online biology calculator to calculate Alpha helix (rotational angle).

Formula:

3×cosΩ=1-4×cosϕ+ψ22

where,
ϕ = Dihedral angle of one residue (angle between two planes),
ψ = Dihedral angle of the next residue (angle between two planes) ,
Ω = The the rotation angle