Practical tools for measured work
Footing bearing-area arithmetic
Calculate bearing-only area from centred service compression and verified allowable soil pressure; no footing thickness design.
How it works
For centred compression, average pressure equals load divided by bearing area. Dividing the entered service force by a verified allowable pressure gives a bearing-only area. Equivalent square and circle dimensions represent that same area.
Before using the result
- Measure from the datum or reference edge described by this tool, and do not mix inside, outside and centerline dimensions.
- Keep inputs in the displayed units and preserve more precision than the final cutting or purchasing tolerance requires.
- When the result is close to a limit, verify it with a test piece, field measurement, manufacturer drawing or qualified project professional.
Limitations
This does not determine a buildable footing. Concrete bending, punching shear, thickness, reinforcing, frost depth, settlement, load combinations, eccentricity and anchor forces remain unchecked. DCA6 has separate prescriptive footing conditions. Do not infer soil capacity from soil appearance or a default value.
Frequently asked questions
What should I verify before using this result?
Recheck the physical measurements, confirm that every input uses the displayed unit, and compare the result with the applicable drawing, product specification, code requirement or test piece.
Why might the finished result differ?
Real work can include thickness, kerf, seams, tolerances, hardware allowances, installation clearances or site conditions that are outside the calculation. The limitations section identifies the main exclusions for this tool.
Related tools
Fence post spacing calculator
Calculate equal fence bays, post counts, centre positions and clear gaps for an open run or closed loop.
Board and batten spacing calculator
Lay out edge-flush battens with equal clear gaps, coordinates, quantities and waste.
Wall framing layout and quantity calculator
Create stud coordinates and cut lists with plates, one door/window opening, explicit header assumptions and waste.
Deck layout planner
Edit a 2D deck plan with board direction, L-shaped cutout, support positions, stock cuts, costs and PDF/SVG/CSV exports.