ModelCalcs.uk
Baseboard Calculator — Layout Construction
Plan baseboard dimensions, support spacing and materials for your model railway layout.
How We Calculate This
Calculates baseboard framing requirements based on your layout dimensions and chosen construction method.
Formula
- Section length = Total length ÷ Number of sections
- Cross members per section = ceil(Section length ÷ Spacing) + 1 (the +1 is the fencepost member — it already supplies the two end battens of every section)
- Framing = (2 × Section length × Sections) + (Cross members × Width) — two full-length girders per section plus every cross member, ends included
- Legs = Legs-per-section × Number of sections
Worked example: a 2400 × 600 mm layout split into 2 sections = 1200 mm boards. Cross members = ceil(1200 ÷ 350) + 1 = 5 per section (10 total). Framing = (2 × 1200 × 2) + (10 × 600) = 4800 + 6000 = 10,800 mm ≈ 10.8 m of 50 × 25 mm softwood, plus 8 legs.
Frequently Asked Questions
Open-frame construction using 50x25mm softwood is the most popular. It is lighter than a flat top, allows scenery below track level, and is easy to modify. Flat-top (9mm ply on a frame) is simpler to build but heavier and limits scenic depth.
For OO gauge, 600mm is a practical maximum for single-sided access. If you can reach from both sides, up to 1200mm works. For N gauge, you can work narrower at 400-500mm. Never make it wider than your comfortable arm reach (about 700mm from the front edge).
Each section should be 1200-1500mm long for portability and storage. Sections longer than 1800mm become unwieldy. If you transport your layout to exhibitions, limit section width to fit through doorways (typically 750mm). Use bolts or dowels to align sections.
Use 50x25mm PSE (planed smooth edges) softwood for frames. 9mm birch plywood for flat tops. 5mm cork sheet for track bed. Avoid MDF for frames as it is heavy and absorbs moisture. Hardwood is unnecessary and expensive — softwood is perfectly adequate.
Related Calculators
Track Length Calculator
Calculate total track length needed for your layout plan including sidings.
Point Spacing Calculator
Work out correct spacing between turnouts and crossings for smooth operation.
Bridge Calculator
Size bridges for your layout — span, clearance height and approach grades.
Tunnel Calculator
Calculate tunnel bore dimensions, portal size and minimum length at scale.
Catenary Calculator
Calculate overhead wire heights, mast spacing and wire sag for electrified lines.
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Last updated: February 2026
All calculations are estimates. Always verify quantities before purchasing materials.