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Simple Truss Calculator

A quick, no-frills truss calculator for fast answers.

Try an example:

Roof Span

Wall-to-wall width of the building

Building Length

Length along the ridge

Pitch Input Choose rise-per-12 or an exact angle

Roof Pitch Rise per 12" of run

Overhang

Eave overhang beyond the wall

Roof TypeChanges slope geometry and area

Min. Usable Ceiling Height (ft)Used for the usable attic/room width result

Material

Truss Spacing (in o.c.)

Your Price per Truss ($)Optional — leave 0 to estimate from lumber

Snow Load (psf)

Wind Load (psf)

Roof Height—

Rafter Length (with overhang)—

Rafter (no overhang)—

Roof Angle—

Rise—

Run—

Roof Area—

Truss Count—

Estimated Lumber—

Material Cost—

Cost per Truss—

Dead Load—

Live Load—

Snow Load—

Wind Load—

Total Weight—

Usable Room Width—

Estimate: $0

Material $0 · Labor $0 · Install $0

Include installation cost in total

Estimates only. Prices vary by region, supplier and site conditions.

Fast estimate in three inputs

Only need the rafter length and truss count? Change the span, length and pitch and ignore the rest. Defaults are filled in for everything else.

When you need loads and cost, open the design calculator. Not sure about terms? See truss design principles.