Construction calculators built for the field, not the classroom

Quick, accurate tools for common project calculations like concrete volume, change order margin, and retainage. Accessible directly in-browser with no registration required.

• Concrete calculator — estimate concrete volume and bags needed for slabs, footings, round columns, and stairs.
• Cost of a delayed RFI calculator — see what slow RFI turnaround is really costing your projects per month and per year.
• Markup & margin calculator — convert between markup and margin so your pricing hits the number you actually intend.
• Change order cost impact calculator — see how a change order shifts your blended project margin before you submit it.
• Retainage calculator — estimate retainage withheld and net payment due on your current pay application.