SiteCalc – Free Construction & Home Calculators

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Concrete Volume

Slabs, footings, columns

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Shape

Length

Width

Thickness / Depth

Units

Waste factor (%)

Concrete Needed

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cubic yards

Cubic metres—

80 lb bags (pre-mix)—

60 lb bags (pre-mix)—

Includes 10% waste factor✓

Always round up when ordering. One 80 lb bag ≈ 0.60 cu ft. One 60 lb bag ≈ 0.45 cu ft.

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Fence Post Calculator

Posts, panels, concrete bags

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Total fence length (ft)

Post spacing (ft)

Panel / section width (ft)

Post hole diameter (in)

Post hole depth (in)

Gate posts?

Total posts needed—

Fence panels / sections—

Concrete per hole (cu ft)—

50 lb bags per hole—

Total 50 lb bags—

Add 1 post for each end and corner. Gate posts should use 4×4 or larger.

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Paint Coverage

Walls, ceilings, trim

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What are you painting?

Room length (ft)

Room width (ft)

Ceiling height (ft)

Coats

Doors (subtract)

Windows (subtract)

Coverage per gallon (sq ft)

Paint Required

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gallons total

Paintable area—

Per coat—

Litres (metric)—

Round up to nearest full gallon. Add 10% for touch-ups and waste.

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Stair Rise & Run

Steps, stringers, code check

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Total rise (inches)

Preferred riser height (in)

Tread depth (in)

Stair width (in)

Number of risers—

Actual riser height—

Number of treads—

Total run (horizontal)—

Stringer length (approx)—

IRC code check (≤7¾" riser)—

IRC requires max 7¾" riser, min 10" tread, max ⅜" variation between any two risers.

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Beam Span Estimator

Deck & floor beam sizing guide

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Beam use

Span between posts (ft)

Tributary width (ft)

Species

Number of plies

Recommended Beam Size

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Total load (approx)—

Span—

Configuration—

⚠️ This is a preliminary estimating guide only. Always verify beam sizing with a licensed structural engineer before construction.

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Mortgage Payoff

Extra payment savings calculator

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Loan balance ($)

Annual interest rate (%)

Years remaining

Extra payment / month ($)

Interest Saved

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Regular monthly payment—

Time saved—

Paid off in—

Total interest (no extra pmts)—

Results are estimates. Consult your mortgage lender for exact figures.

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Roof Pitch & Area

Slope, rafter length, shingles

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Building width (ft)

Building length (ft)

Rise (inches per 12" run)

Roofing material

Overhang per side (ft)

Roof pitch—

Pitch angle—

Rafter length—

Total roof area—

Roofing squares (100 sq ft)—

Bundles / panels needed—

Add 10–15% waste factor for cutting and overlaps. Always verify with a licensed roofing contractor.

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Drywall Calculator

Sheets, screws, tape, compound

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Room length (ft)

Room width (ft)

Ceiling height (ft)

Sheet size

Doors

Windows

Include ceiling?

Total area—

Drywall sheets—

Drywall screws (lbs)—

Joint tape (ft)—

Joint compound (buckets)—

Add 10% waste factor. One 5-gal bucket of compound covers approx. 200 sq ft of joints.

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Deck Builder

Boards, joists, posts, concrete

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Deck length (ft)

Deck width (ft)

Decking board width

Post spacing (ft)

Joist spacing (inches)

Deck area—

Decking boards needed—

Joists needed—

Posts needed—

Concrete bags (50 lb) per post—

Add 10–15% waste for decking boards. Always verify with local building codes before construction.

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Unit Converter

Imperial ↔ Metric for construction

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Conversion type

Amount

From

To

Result

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Material Cost

Quantity × price with waste factor

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Material name (optional)

Quantity needed

Unit

Price per unit ($)

Waste factor (%)

Tax rate (%)

Total Cost (with tax)

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Qty with waste—

Subtotal (before tax)—

Tax amount—

Construction & homecalculators that work.

Construction & home
calculators that work.