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Räkna.nu

Deck calculator: metres per m² and cost

How many metres of decking do I need per m²?

For 145 mm boards, 5 mm gaps and a 4 × 3 m deck, the example buys 84 metres without waste allowance: 7 m/m². With 10% waste it buys 96 metres, or 8 m/m². The result divides purchased board length by area, including whole stock lengths and waste. It is not a universal coverage rate. The example uses 4 m stock boards laid along the 4 m side.

Deck calculator: metres per m² and cost

Calculate deck boards, purchased metres per m², joists and screws. Enter board sizes, waste and your prices for materials, labour and delivery.

Your details
m
m
mm
m
SEK

Prices are your own in SEK, including whichever VAT you budget for. Labour and delivery are added separately. A zero price means a missing cost, not free materials.

SEK

Prices are your own in SEK, including whichever VAT you budget for. Labour and delivery are added separately. A zero price means a missing cost, not free materials.

SEK

Prices are your own in SEK, including whichever VAT you budget for. Labour and delivery are added separately. A zero price means a missing cost, not free materials.

Advanced settings
mm
m

No cutting optimisation or reuse between rows. Each board segment has its own end supports: two joists at each aligned butt joint. Rim joists, beams, fittings and foundations are excluded. Spacing and sizes are assumptions, not structural advice.

%
SEK

Prices are your own in SEK, including whichever VAT you budget for. Labour and delivery are added separately. A zero price means a missing cost, not free materials.

SEK

Prices are your own in SEK, including whichever VAT you budget for. Labour and delivery are added separately. A zero price means a missing cost, not free materials.

Results update instantly

Results

Example using default values

Prices are your own in SEK, including whichever VAT you budget for. Labour and delivery are added separately. A zero price means a missing cost, not free materials. No cutting optimisation or reuse between rows. Each board segment has its own end supports: two joists at each aligned butt joint. Rim joists, beams, fittings and foundations are excluded. Spacing and sizes are assumptions, not structural advice.

Total budget
SEK 0

Prices are your own in SEK, including whichever VAT you budget for. Labour and delivery are added separately. A zero price means a missing cost, not free materials.

Result details

Material cost
SEK 0

Prices are your own in SEK, including whichever VAT you budget for. Labour and delivery are added separately. A zero price means a missing cost, not free materials.

Area
12 m²
Board rows
21
Result details

Result details

Boards to buy
24
Purchased board length
96 m
Purchased decking metres per m²
8 m/m²

Purchased board length divided by area, including waste and whole stock lengths. Undefined at zero area.

Joists in layout
9
Joist length with waste
29.7 m
Screws with waste
416
Analysis & guidance

  • How many metres of decking do I need per m²?

    For 145 mm boards, 5 mm gaps and a 4 × 3 m deck, the example buys 84 metres without waste allowance: 7 m/m². With 10% waste it buys 96 metres, or 8 m/m². The result divides purchased board length by area, including whole stock lengths and waste. It is not a universal coverage rate. The example uses 4 m stock boards laid along the 4 m side.

  • What do materials for a 12 m² deck cost?

    4 × 3 m, 145 mm boards, 5 mm gaps and 4 m stock lengths give 21 board rows. With 0% waste and 0.5 m joist spacing: 21 boards, 27 m of joists and 378 screws. At 100 SEK/board, 20 SEK/m and 1 SEK/screw, materials cost 3,018 SEK. Purchased metres per m² include cutting leftovers. Changing stock length to 3 m needs 42 boards of 3 m: 126 metres or 10.5 m/m² without waste allowance. The model does not reuse offcuts between rows.

  • What is excluded from the deck estimate?

    No cutting optimisation or reuse between rows. Each board segment has its own end supports: two joists at each aligned butt joint. Rim joists, beams, fittings and foundations are excluded. Spacing and sizes are assumptions, not structural advice.

About this calculator

Deck calculator: metres per m² and cost

Calculate deck boards, purchased metres per m², joists and screws. Enter board sizes, waste and your prices for materials, labour and delivery.

How many metres of decking do I need per m²?

For 145 mm boards, 5 mm gaps and a 4 × 3 m deck, the example buys 84 metres without waste allowance: 7 m/m². With 10% waste it buys 96 metres, or 8 m/m². The result divides purchased board length by area, including whole stock lengths and waste. It is not a universal coverage rate. The example uses 4 m stock boards laid along the 4 m side.

How are boards, joists and screws calculated?

Board rows round up from width and gaps. Each row buys separate whole stock lengths, then waste is added. Joists include both end supports and screws use two per crossing.

What do materials for a 12 m² deck cost?

4 × 3 m, 145 mm boards, 5 mm gaps and 4 m stock lengths give 21 board rows. With 0% waste and 0.5 m joist spacing: 21 boards, 27 m of joists and 378 screws. At 100 SEK/board, 20 SEK/m and 1 SEK/screw, materials cost 3,018 SEK.

Purchased metres per m² include cutting leftovers. Changing stock length to 3 m needs 42 boards of 3 m: 126 metres or 10.5 m/m² without waste allowance. The model does not reuse offcuts between rows.

What is excluded from the deck estimate?

No cutting optimisation or reuse between rows. Each board segment has its own end supports: two joists at each aligned butt joint. Rim joists, beams, fittings and foundations are excluded. Spacing and sizes are assumptions, not structural advice.

Prices are your own in SEK, including whichever VAT you budget for. Labour and delivery are added separately. A zero price means a missing cost, not free materials.

For installation and fastening guidance, see Svenskt Trä.

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How to read this calculator

These results are meant as guidance. They are based on rules, assumptions, and simplified models that can differ from your exact real-world situation.

Estimate, not a legal decision

Use the result as decision support and planning help. For high-stakes choices, confirm the details with the relevant authority, lender, employer, or adviser.

Methodology

Each calculator uses defined inputs, assumptions, and logic. We explain the broader approach on the methodology page.

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Sources and updates

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