Description Overview Hoppus-explanation formula for log volume calculation C is the circumference of the log in meters L is the length of the log in meters 0.03 is the 3 cm allowance in circumference 16 is the constant factor in the Hoppus formula Formula 1 Hoppus m³ = (C – 0.03) × (C – 0.03) × L / 16 1 Hoppus m³ = 35.315 cubic feet