Concept Drafts › Free build calculators
Free build calculators
Free and no sign-up needed, for quick checks. When you are planning the whole thing, a concept draft works the numbers out together.
Battery run time and range calculator
How long a battery runs a motor or load, and how far you'll go at a given speed.
Solar panel and battery size calculator
How many panels and how much battery you need for your daily energy use.
Board feet and lumber cost calculator
Board feet and cost for hardwood or lumber, with a waste allowance.
Concrete for a slab or footing calculator
Cubic yards of concrete and the number of bags for a slab, pad or footing.
DC wire size (voltage drop) calculator
The smallest copper wire size that keeps voltage drop under your limit on a DC run.
Build budget with contingency calculator
A realistic total for any build: parts, labor, permits, a contingency and tax.
Start with an idea. Finish with a plan.
Describe it in one sentence. Specs, drawings, parts with prices and the rules to check, in about a minute.
For planning only: have a qualified professional check any design before you build or use it.