Free tools
Construction Quantity Calculators
Quick planning quantities for concrete, masonry, drywall, roofing, paving and paint.
Use these calculators for quick, early quantities. They are planning tools — a real quantity takeoff measures the actual drawings, openings, details and waste. All results update as you type.
Concrete volume (slab or footing)
Cubic yards (incl. waste)
Formula: length × width × thickness ÷ 12 ÷ 27, plus waste. See concrete estimating.
CMU block count (8×8×16)
Blocks needed
Formula: (area − openings) × 1.125 blocks per SF, plus waste. Grout, mortar and reinforcing are separate. See masonry estimating.
Drywall sheets (4×8)
Sheets needed
Formula: area ÷ 32 SF per sheet, plus waste. Count each board layer separately. See drywall estimating.
Roofing squares
Roofing squares (100 SF each)
Formula: plan area × slope factor √(1 + (pitch ÷ 12)²) ÷ 100, plus waste. See roofing estimating.
Asphalt paving tonnage
Tons of asphalt
Formula: area × thickness ÷ 12 × density ÷ 2,000. Mix density varies — use your supplier\'s value. See paving estimating.
Paint gallons
Gallons needed
Formula: area × coats ÷ coverage. Coverage depends on product and surface. See finishes estimating.
How estimators use quick quantity calculators
Early in a project — before drawings are complete — estimators use simple formulas to check scope, compare budgets and sanity-check a detailed takeoff. Ratios such as concrete per square foot of slab, blocks per square foot of wall, sheets per square foot of partition and tons per area of paving give a quick reasonableness test. If a detailed quantity takeoff disagrees sharply with the simple answer, something is worth rechecking: scale, thickness, openings, a missed detail or a double-counted area.
Limitations
These tools assume simple geometry and standard unit sizes. They do not account for irregular shapes, reinforcement, forms, corners, returns, accessories, specification requirements or local conditions. Use your own waste factors and supplier data, and rely on a full takeoff for bidding. Related: quantity takeoff explained, glossary and FAQ.
Frequently asked questions
Are these calculators a replacement for a takeoff?
+
No. They give quick planning quantities. A real quantity takeoff measures the actual drawings, openings, details and waste for your project.
What waste factor should I use?
+
Waste depends on material, layout and installer. The calculators let you enter your own percentage; we state waste separately in every estimate so you can adjust it.
Can you check my quantities?
+
Yes. Upload your plans and we will prepare a quantity takeoff or review yours.
Get an accurate construction estimate for your next bid
Upload your plans for a free quote on estimating, takeoff, structural or permit drawings. We reply with scope, price and turnaround.
Upload Plans & Get a QuoteBid Sharp at a glance: 3 steps, 50 states
Bid Sharp prepares construction estimates, takeoffs, shop drawings, structural and permit drawings and schedules for contractors and homeowners in all 50 states, on public and private projects. Typical turnaround is about 48 hours; the turnaround and a firm price are confirmed before any work starts.
- 1. Upload plans. Send PDF, DWG or a plan-room link with your bid due date.
- 2. Get a firm quote. Scope, price and turnaround in writing, with no obligation.
- 3. Receive deliverables. Excel and PDF files, plus DWG for drawings, checked by 2 team members.
Standards and official sources
Rules, wage rates, codes and procurement procedures change and differ by agency. Confirm the requirements that apply to your project with these primary sources and with the solicitation itself.
Keep exploring
Last updated by the Bid Sharp estimating team.