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While I agree with Amir's point that this forum will have a selection bias, considering how most design load sizing is a form of energy modeling, the answer is: 1. Microsoft Excel 2. Microsoft Excel, with VBA macros spawned from Dante's fifth level of hell 3. A hand calculator where people multiply sf/ton values they have written on a sticky note on their monitor 4. Trace/HAP and other mechanical load calculation software 5. Everything else is in the noise

While I agree with Amir's point that this forum will have a selection bias, considering how most design load sizing is a form of energy modeling, the answer is: 1. is:

  1. Microsoft Excel 2. Excel
  2. Microsoft Excel, with VBA macros spawned from Dante's fifth level of hell 3. hell
  3. A hand calculator where people multiply sf/ton values they have written on a sticky note on their monitor 4. monitor
  4. Trace/HAP and other mechanical load calculation software 5. software
  5. Everything else is in the noise