Spike's Calculators


Francon Measure

Spike VM

This is the Hoppus foot rule in metric format with results in Francon cubic metres (fr. M³).

To avoid confusion, the cubic metre result from Hoppus is referred to as a Francon cubic metre.

Formula used:

V = (G ÷ 4)² * L ÷ 10000
V = volume in Francon cubic metres
G = girth measured mid point of the log in centimetres
L = length of log in metres

one Francon cubic metre (fr. M³) = 1.27324 cubic metres (m³)
one Francon cubic metre (fr. M³) = 44.964 cubic feet (ft³)
one Francon cubic metre (fr. M³) = 35.315 Hoppus feet (h ft)
Circumference of Log Measured Mid Length
Log Circumference cm
Length of Log M


Francon Cubic Metres: Fr M³
Log Volume in Cubic Metres:
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