All,
It may sound odd, but my "Old Man" (god bless his sole) told me years ago a formula that I still use to this day. Estimate conservatively and come up with a number - Double it and add 50%. This works for everything from Job pricing to force factors. I have spent fortunes over the years on all kinds of costing / estimating software, and I almost always fall back on this concept. Use your best guess based on your knowledge and what ever engineering formulas you have, double it and add 50%. You will be surprised to see how often it turns out to be correct and in concert with your best software / formula's that are out there.
Regards,
Glen |