Calculators & Convertors

Why not use these helpful conversion tips and calculator links and make your next project that little easier! Of course, your local branch of Howarth Timber & Building Supplies is only a phone call away for any queries not covered here.

Timber and sheet Materials
Measuring up – to convert multiply by the figure shown.

Inches into Millimeters - 25.4
Millimetres to Inches - 0.03937
Feet to Metres - 0.3048
Metres to Feet - 3.281
Square Metres to Square Feet - 0.929
Square Feet to Square Metres - 10.764
Cubic Metres to Cubic Feet - 35.315
Cubic feet to Cubic metres - 0.028

Number of Linear m in a m3 is calculated by multiplying the section size then dividing into 1,000,000, so:

25 x 100 = 2500
1,000,000/2500 = 400 linear m in a m3 of 25 x100
47 x 150 = 7050
1,000,000/7050 = 141.84 linear m in a m3 of 47 x 150

Floor fitting tips

Always allow floors to acclimatize before laying.
Always allow expansion gaps on all sides and at every room dividing section.

Brick Calculator
Click here to calculate the amount of bricks required for a given area.

Planit Design Online
Design Online is a simple, intuitive facility which allows your local Howarth Timber & Building Supplies branch to create your perfect kitchen! Click here for more details or contact your local branch to arrange a no obligation consultation.

Building materials - general guidelines

To maintain the strength of ready mixed concrete delivered to site, never add water to the prescribed mix.
Because shingle is a natural product never assume that it will be a particular colour.
For external rendering washed sand should be used.
When using more than one pack of paving bricks or tiles, always use from different packs at random to avoid shade variations.

Concrete mixes for paths and oversight slabs

1 Volume Cement
5 Volumes Ballast
12 Bags Cement
1m3 Ballast - makes 0.85m3 of concrete

For flooring or paving

Use Blended or Washed sand
1 Volume Cement
3 Volumes Sand
18 Bags of Cement
1m3 Sand - makes 0.9m3 of concrete

For walls

Plaster Coverage per 25kg Bag
Thistle multi Finish - 10m2 at 2mm
Thistle Bonding - 2.75m2 at 11mm
Thistle Hardwall - 3m2 at 11mm
Thistle Tough Coat - 3.5m2 at 11mm
Thistle Universal Coat - 2.25m2 at 13mm

Plasterboards (maximum spacing and fixing nails)

Board size: 2400 x 1200 x 9.5
400mm c/s = 51 nails per sheet
Board size: 2400 x 1200 x 12.5
450mm c/s = 41 nails per sheet

For small Jobs

Brick size: 65 x 215 x 100
Approximate quantities for single brickwork of 60 bricks per m2 allow 0.8m3 sand per 1000 bricks
Block size: 215 x 450 x 100
Approximate quantities for single blockwork of 10 Blocks per m3 allow 0.8m3 of sand per 40m2 of blockwork.

Name*

Address*

Postcode*

Company name

Phone number*

Mobile

Email*

The Howarth Timber Group and its affiliates may use information supplied to keep you up to date with developments and special offers it deems will be of interest. Completion and submission of this form indicates acceptance of our terms and conditions, a fully copy of these are available upon request. Please tick this box if you do not wish to receive such information from us but remember that this will preclude you from receiving our special offers or promotions