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To determine how much paint you need for your project you will need the following information:1.Surface area of the surface(s) to be painted (excluding areas wherethere are windows, doors etc).2.Spreading rate of the paint being used.3.The number of coats required.Once you have the above information, you can calculate the amount required as follows:Total surface area (in square metres)Divided by ÷Spreading rate of paint (in square metres per litre)Multiplied by xNumber of coatsEquals =Total litres requiredPorous, rough and textured surfaces (e.g. corrugated iron or rough plaster) will require more paint.WorksheetExampleYour ProjectSurface42m2 m2Spreading rate per litre÷ 11m2/L÷ m2Number of coatsx 2 x Total paint required= 7.6 litres = litres DIY InfoEstimating paint...how much do I need?For example1.To paint the living room walls excluding the ceiling. The walls are 3 metres high, each wall is approx 4 metres in width, and windows and doors make up approx 0.5 of a metre of each wall leaving a paintable surface of 3.5 metres per wall. The surface area to paint is therefore 14 metres (4 walls x 3.5 metres each) x3metres high = 42 square metres.
Quick steps...to estimate paint litres from house plansTo get a rough idea of how much paint you will approximately need when you only have house plans to work from, use the following calculations...Look for the statement of area on the house plans, e.g. 186m2Divide this by÷10=litres of sealer for ceilings÷5 =litres of 2 coats for ceilings÷4=litres of sealer for walls÷2=litres of 2 coats for walls÷25 =litres of primer for trim/doors/frames÷15=litres of 2 coats for trim/doors/framesThis quick estimate works as a general guide for most houses, but extreme designs or colour palettes tailored to each room will need a more careful approach with each room calculated individually.2.T he walls are currently painted and are in good condition. Resene SpaceCote Low Sheen is the selected paint system. The product label and data sheet tells us that it has a theoretical spreading rate of 11 square metres per litre. (You can also get spreading rate information from the Resene website (check out the Product Data Sheet section).3.As the walls are previously painted and in good condition, only two coats of Resene SpaceCote Low Sheen are required.The amount of paint required is therefore:Surface area: 42 square metresDivided by ÷Spreading rate: 11 square metres per litreMultiplied by xNumber of coats: 2 coatsEquals =42/11 x 2 = 7.6 litresThis tells us that 7.6 litres of paint is required to paint two coats onto the living room walls. The best idea would then be to purchase 8 litres giving enough paint to complete the job and sufficient to go back if touch up is required later.To make calculating your paint requirements even easier, the Resene website includes a paint calculator. Let your mouse help you with the calculations by visiting www.resene.com/paintcalculator.© Copyright Resene Paints Ltd, July 2003. Printed on environmentally responsible paper, which complies with the requirements of environmental management systems EMAS and ISO14001, using vegetable-based inks. Please recycle.In Australia: Call 1800 738 383 visit www.resene.com.au or email us at advice@resene.com.auIn New Zealand: Call 0800 RESENE (737 363) visit www.resene.co.nz or email us at advice@resene.co.nz