Hi Rik, L = 0.4*(A+B)*(ln((A+B)/d)+7.6-0.35*(A+B)^2/(A*B)) where L = loop inductance in uH, A = loop height in m, B = loop length in m and d = wire diameter in mm The formula would be valid for loops
Having a closer look at the formulas for different loop shapes gives an indication that there is a correlation between the inductance of a loop and the ratio of perimeter^2/area. If this is correct i