Decking Calculator

Decking Calculator

Decking Calculator

Use our Decking Calculator to help you get all the pieces you need to create your garden decking to whatever size you need.

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downloads the latest products and prices.

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What shape decking do you require?

For other shapes please call our sales department
for advice on

Configure your shape

Please give us the measurements, in millimetres, of the size you would like your decking to be. Please note, 1m is the equivalent to 1000mm:

  • mm
  • mm
  • mm
  • mm

Useful Conversions

0.5m = 500mm   2.0m = 2000mm
1.0m = 1000mm   2.5m = 2500mm
1.5m = 1500mm   3.0m = 3000mm

Which direction should your boards run?

  1. 1000
  2. 1000
  3. 1000
  4. 1000

Boards should always run the opposite way to the natural direction of traffic.

We have two types of boards available, either standard, or heavy duty (best used for decking that will have heavy usage)

Please select which board you need:

  • Standard

    Planed from 100x25mm section boards giving a finished size of approx 95x21mm

  • Heavy Duty

    Planed from 150x32mm section boards giving a finished size of approx 143x28mm

Are you building your deck on flat ground or sloping ground?

On sloping ground there is some tolerance in the posts

If your slope is above 350mm in difference then please call us on to arrange a site visit.

If your slope is below 350mm in difference then you can select posts based on flat ground as there is suitable tolerance in post depths.

My site has less than 350mm difference in slope

On flat ground you will need of the same height posts

Please select a height:

  • Recommended 0.6m Note: max. 400mm out of ground, 200mm in ground
  • 0.9m Note: max. 700mm out of ground, 200mm in ground
  • 1.2m Note: max. 900mm out of ground, 300mm in ground

Add fascia boards* to finish off your new decking:

We have calculated that you will need a minimum of:
fascia boards.
(3.6m x 95mm x 21mm nominal)

This is based on decking laid on even height posts, you may need to add to this figure to allow for parts of your decking being taller than a single fascia board.
Add fascias Do not add any fascias

* Fascia boards are standard decking boards

Choose your extras

We’ve calculated how many packs of screws and nails, bags of postcrete and how much weed suppressant membrane we think you will need and filled in the boxes below based on our calculations...
  • Screw Pack (200)

    Screw Packs (200 in pack)


    60mm Decking Screw Stainless steel T25 torx drive.Pail containing 200 pcs + driver bit.
    I would like packs (@ X.XX each)
  • Screw Pack (500)

    Screw Packs (500 in pack)


    60mm Decking Screw Stainless steel T25 torx drive.Pail containing 500 pcs + driver bit.
    I would like packs (@ X.XX each)
  • Nail Pack (1kg - approx 145 nails)

    Nail Pack (1kg - approx. 145 nails)


    1kg Pack 75mm(3") Nails Galvanised Round Wire 3.75mm Gauge. Count of nails Approx 145 per kg. 2 nails per decking post.
    I would like packs (@ X.XX each)
  • Weed Suppressant Membrane

    Weed Suppressant Membrane (12m x 1m)


    Weed Suppressant for use with Garden Decking for ground cover to stop weeds. Heavyweight, flexible and easy to use.
    I would like packs (@ X.XX each)
  • Weed Suppressant Membrane

    Weed Suppressant Membrane (50m x 1m)


    Weed Suppressant for use with Garden Decking for ground cover to stop weeds. Heavyweight, flexible and easy to use.
    I would like packs (@ X.XX each)
  • 2 Tread Decking Stringer

    2 Tread Decking Stringer


    A minimum of 2 stringers are required per staircase (add 1 extra stringer per 450mm width of step). Extra boards will also be required depending on the width of the staircase, also allowing for 2 steps, add 1 x 3.6m standard decking board per step based on an example 700mm wide step with 5 cut lengths per step.

    Example, 5 x 900mm (width of step) = 4500 (total) / 3600 (length of board) = 1.25 boards x 2 (no. of steps) = 2.5 boards rounded up to 3 boards required to create steps.
    I would like stringers (@ X.XX each)
  • 3 Tread Decking Stringer

    3 Tread Decking Stringer


    A minimum of 2 stringers are required per staircase (add 1 extra stringer per 450mm width of step). Extra boards will also be required depending on the width of the staircase, also allowing for 3 steps, add 1 x 3.6m standard decking board per step based on an example 700mm wide step with 5 cut lengths per step.

    Example, 5 x 900mm (width of step) = 4500 (total) / 3600 (length of board) = 1.25 boards x 3 (no. of steps) = 3.75 boards rounded up to 4 boards required to create steps.
    I would like stringers (@ X.XX each)
  • 4 Tread Decking Stringer

    4 Tread Decking Stringer


    A minimum of 2 stringers are required per staircase (add 1 extra stringer per 450mm width of step). Extra boards will also be required depending on the width of the staircase, also allowing for 4 steps, add 1 x 3.6m standard decking board per step based on an example 700mm wide step with 5 cut lengths per step.

    Example, 5 x 900mm (width of step) = 4500 (total) / 3600 (length of board) = 1.25 boards x 4 (no. of steps) = 5 boards required to create steps.
    I would like stringers (@ X.XX each)
  • 5 Tread Decking Stringer

    5 Tread Decking Stringer


    A minimum of 2 stringers are required per staircase (add 1 extra stringer per 450mm width of step). Extra boards will also be required depending on the width of the staircase, also allowing for 5 steps, add 1 x 3.6m standard decking board per step based on an example 700mm wide step with 5 cut lengths per step.

    Example, 5 x 900mm (width of step) = 4500 (total) / 3600 (length of board) = 1.25 boards x 5 (no. of steps) = 6.25 boards rounded up to 7 boards required to create steps.
    I would like stringers (@ X.XX each)
  • Extra Decking Board for Steps

    Extra Regular Decking Board
    for use with Stringers to build steps


    High Quality Natural Decking Board (ex 25mm x 100mm) 3.6m long board in natural finish. Jackured for 25 year decking guarantee. Boards are planed from 100x25mm section boards giving a finished size of approx. 95x21mm
    I would like boards (@ X.XX each)
  • Postcrete

    Postcrete


    20kg bag of Postcrete. We recommend 60kg (2 x 20kg bags) per post. Sets posts within 5 - 10 mins - saving you time. Just add water - no mixing required.
    I would like bags (@ X.XX each)
  • Jakure End Grain Preservation

    Jakcure End Grain Preservative


    Jakcure End Grain Preservative (500g bottle). When cutting or drilling our treated timber products it is essential to apply Jakcure® End Grain Preservative to ensure cut timber is not left untreated. This will also keep your 25 year Jakcure Guarantee valid.
    I would like packs (@ X.XX each)

Order Summary

Rectangular Decking

Surface area:    
Board type:    
Board Direction:    
Boards (3.6m):  
Joists (3.6m):  
Posts:  
Fascias boards:  
Extras:      
Screw Packs (200 in pack)  
Screw Packs (500 in pack)  
Nail Packs (1kg)  
Weed Suppressant Membrane 12m x 1m  
Weed Suppressant Membrane 50m x 1m  
2 Tread Decking Stringer  
3 Tread Decking Stringer  
4 Tread Decking Stringer  
5 Tread Decking Stringer  
Regular Decking Board (3.6m)  
Postcrete  
Jakcure End Grain Preservative  
      Discount: £XXX.XX
      Total £:XXX.xx

Important information below, please read and print.

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Start again Need help? 0800 408 2234

Installing your new Deck

We have calculated your deck based on the following installation guidelines:

Joist and Post Installation

  1. The number of rows of joists is:
  2. The space between each row of joists is: mm
  3. Please ensure that you allow for at least 3 posts per joist 
  4. Please note, we have allowed for a 5% increase in boards to ensure that you have enough to complete your project

Laying your joists

When laying your joists please start at row 1 by laying one complete joist at a right angle to the direction that your boards are going to run. Continue to lay joists end on end until you have exceeded the width of your deck. Cut off any excess joist and then start row 2 with the resulting off cut. Please see the diagram below for a visual representation of this. 

Diagram to show how the offcut from row 1 should be used to start row 2.

Example shown based on a 5000mm (5m) wide deck.

Fascias

All our fascias are standard decking boards. Should you wish to add a fascia we have calculated that you will need of these to finish off your deck. 

Please note

Please note all prices quoted are exclusive of VAT (unless otherwise stated). The VAT amount will be calculated and shown on the Shopping Basket page once you have added your product selection to it.

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