Soil Heat for Propagation

Hillsborough, NC(Zone 7b)

Ok, kind of a technical question here, which probably falls more toward the greenhouse or propagation end of the spectrum.

Q: Has anyone worked out a formula to calculate how many feet of heating cable to get for a sand table hot-bed? Because it would be much easier to decide how much money to budget if I knew how much length I'm actually going to need, and I'm... not great with math.

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