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Construction & home
calculators that work.

Fast, accurate tools for concrete, fencing, paint, stairs, beams, and mortgage payoff. Built for contractors, tradespeople, and homeowners.

11
Free Tools
0
Signups Needed
Calculations
All Calculators
🪨
Concrete Volume
Slabs, footings, columns
+
Concrete Needed
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 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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Paint Required
gallons total
Paintable area
Per coat
Litres (metric)
Round up to nearest full gallon. Add 10% for touch-ups and waste.
🪜
Stair Rise & Run
Steps, stringers, code check
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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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Recommended Beam Size
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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Interest Saved
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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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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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 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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Result
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Material Cost
Quantity × price with waste factor
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Total Cost (with tax)
Qty with waste
Subtotal (before tax)
Tax amount