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A closed-form expression is presented in this brief to accurately estimate the effective inductance of a single layer within an interdigitated power and ground (P/G) distribution network. Due to the large number of P/G lines in these networks, excessive time is required to calculate the inductance using 3-D simulation tools. The proposed expression is favorably compared with previous models and FastHenry, exhibiting accuracy and computational efficiency. The inductance of a single layer within an interdigitated P/G distribution network is bounded for any number of lines. The error of the proposed expression rapidly decreases with an increasing number of pairs within the network. The upper bound for the error of the proposed model is also determined.