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Category 3 of 10

Structural & Load Engineering Calculators

The framing math behind a staircase that has to actually carry weight — stringer spacing, beam spans, landing framing, footings, ledger attachment, joist hangers and load capacity. These sit between your geometry layout and your material take-off.

7
Calculators in this category
93
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2
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Search all 93 calculators by name — not just this category.

Commonly searched

Three calculators most framing questions start from

Stringer spacing, footing size, and load capacity cover the questions that come up before you even get to hardware counts — start here if you're not sure which of the seven you need.

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Center-to-center

Stringer Spacing Calculator

Max stringer spacing by tread material and load, flags when a third stringer is needed.
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Concrete footing

Stair Footing Size Calculator

Concrete footing dimensions for exterior and deck stair posts.
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Load rating

Stair Load / Weight Capacity Calculator

Live load capacity check against residential and commercial minimums.
All 7 calculators

Browse by framing task

Grouped into two practical sets — sizing the frame itself, and the hardware and load checks that go with it.

Framing & Spans 4

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Center-to-center

Stringer Spacing Calculator

Max stringer spacing by tread material and load, flags when a third stringer is needed.
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Landing beam

Stair Beam Span Calculator

Maximum span for the beam carrying a stair landing or top platform.
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Platform framing

Landing Framing Calculator

Joist size and spacing for a stair landing platform's structural frame.
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Concrete footing

Stair Footing Size Calculator

Concrete footing dimensions for exterior and deck stair posts.

Hardware & Load Rating 3

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Fastener spacing

Ledger Board Attachment Calculator

Fastener count and spacing for attaching a stair ledger to a rim joist.
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Hardware count

Joist Hanger Count Calculator

Number of hangers needed for a landing or stair platform frame.
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Load rating

Stair Load / Weight Capacity Calculator

Live load capacity check against residential and commercial minimums.
FAQ

Common questions about stair framing

Does the Stringer Spacing Calculator cover a center stringer on wide stairs?
Yes. A separate Center Stringer Calculator used to exist, but that question is just this calculator's output at wider stair widths, so it's now built into Stringer Spacing — the tool flags when a third, center stringer is required.
What's the difference between Landing Framing and Landing Size?
Landing Framing (here) sizes the joists and spacing that structurally support a landing platform. Landing Size, over in Code Compliance, checks the code-minimum footprint dimensions instead — different question, same landing.
What's the difference between Ledger Board Attachment and Joist Hanger Count?
Ledger Board Attachment sizes the fasteners bolting your ledger into a rim joist. Joist Hanger Count is a separate hardware question — how many metal hangers you need for the landing or platform frame itself.
Does the Load / Weight Capacity Calculator replace an engineer's sign-off?
No. It's a planning-stage check against residential and commercial minimums so you know roughly where you stand. For a permit stamp, a licensed structural engineer or your local building official still needs to sign off.
Keep going

Browse the other 9 categories

Once your frame is sized, these are the natural next stops — stair configuration, material take-offs, railing, code checks and cost.

📐Core Geometry & Layout 10 🌀Stair Types & Styles 15 🧰Material-Specific Structural 11 🎨Materials, Finishing & Cut-Lists 10 🛡️Railing, Baluster & Safety 7 📋Code Compliance 8 💲Cost & Estimating 10 ✨Specialty & Accessories 9 🔁Conversion & Unit Tools 6