...under perpetual construction.

The low-frequency inductance of single-turn rectangular loops made of **round wire** can be estimated accurately with the formula found in `[1]`; a simpler formula for a limited range of sides ratio was proposed by Rik Strobbe, ON7YD and is compared with the Terman formula and with electromagnetic simulations here.

The Terman formulas are used in the following forms:

Terman has also a formula for the low-frequency inductance of single-turn rectangular loops made of **rectangular wire**:

References:

[1] |
F.E. Terman, "Radio Engineers' Handbook," London, McGraw-Hill, 1st ed., Sep. 1950. |