How to Measure Lawn Turf for a Perfect Fit
Measure lawn turf before you order, not once the delivery is on its way. A few minutes with a tape measure can prevent a shortfall halfway through laying, or leave you with more rolls than your project needs. Whether you are replacing a worn family lawn, finishing a new-build garden or preparing a larger landscaping job, the aim is simple: work out the square metres accurately, then allow enough for cutting and shaping.
Fresh turf is best laid as soon as possible after delivery, so getting the quantity right helps the job run smoothly from the first roll to the last.
What you need to measure a lawn
For most gardens, you only need a long tape measure, a notepad, a pen and a calculator. A measuring wheel can make larger gardens quicker to survey, while a piece of string is useful for following curved edges.
Take every measurement in metres. Turf is normally calculated in square metres, so measuring in metres from the start avoids converting feet and inches later. Measure the widest and longest points of each area, write them down clearly and sketch a rough plan of the lawn if its shape is anything other than a simple rectangle.
Do not measure patios, borders, sheds, paths or planting beds as part of the lawn area. Mark these on the sketch and measure around them. It sounds obvious, but overlooking a circular trampoline base or a wide border is an easy way to order too much turf.
How to measure lawn turf in square metres
The basic calculation is length multiplied by width. If a lawn is 8 metres long and 5 metres wide, the calculation is:
`8m x 5m = 40m²`
That garden needs 40 square metres of turf before any allowance for cuts is added. Measure each side twice if possible, particularly where fences, walls or edging are not perfectly straight.
Rectangular and square lawns
A square or rectangle is the quickest shape to calculate. Multiply the length by the width and record the result. If the lawn is made up of two rectangular sections, calculate each section separately and add them together.
For example, a front lawn measuring 4m by 3m is 12m². A side section measuring 6m by 2m is another 12m². The total area is 24m².
This method also works well when an L-shaped lawn is divided into two smaller rectangles. Trying to guess the overall shape usually causes errors. Splitting it into straightforward sections keeps the figures clear.
Triangular corners and pointed areas
For a triangular section, multiply the base by the height, then divide by two.
`Base x height ÷ 2 = square metres`
A triangle with a 4m base and a 3m height is 6m². Measure the height at a right angle to the base, not along the sloping edge. This is particularly useful for lawns that narrow towards a gate, driveway or curved planting area.
Circular lawns and rounded features
A full circular lawn needs a slightly different calculation. Measure from the centre of the circle to the outer edge - this is the radius. Multiply the radius by itself, then multiply that number by 3.14.
`Radius x radius x 3.14 = square metres`
For a circle with a radius of 3m, the area is just over 28m². If the lawn is a half-circle, divide the final figure by two. For a quarter-circle, divide it by four.
Most domestic lawns are not perfect circles, so treat this figure as a sensible estimate and allow a little more for trimming around the edge.
Measuring an irregularly shaped garden
Curves, trees, established borders and winding paths can make a lawn look difficult to measure. The practical answer is to break the space into sections you can calculate: rectangles, squares, triangles and part-circles.
Start with the largest rectangular area. Then add the smaller sections around it and subtract areas occupied by permanent features. For a lawn with a sweeping curved edge, measure the main rectangle and use a string line to judge where the curve sits. It is better to round up slightly than rely on a tight estimate that leaves no room for cuts.
On a large or unusually shaped site, create a simple grid. Measure the garden in strips or blocks, calculate each one and add the totals. This takes longer than one overall measurement, but it gives a far more dependable order quantity for complicated gardens and commercial work.
Add an allowance for cuts and shaping
The calculated lawn area is not always the amount you should order. Turf has to be cut at fence lines, around drain covers, beside paths and against curved borders. Those offcuts cannot always be used elsewhere.
For a plain square or rectangular lawn with straight edges, adding around 5% is usually enough. For a garden with several curves, narrow strips, trees or awkward corners, allow around 10%. If the design includes many small beds and features, it may be worth discussing the plan before ordering rather than guessing.
As an example, a lawn measuring 40m² with mostly straight sides needs approximately 42m² when a 5% allowance is added. A curved 40m² lawn may need 44m². Rounding up to the nearest whole square metre keeps ordering simple and gives the person laying the turf enough material to make tidy cuts.
Do not add a large allowance simply because the lawn is uneven. Uneven ground needs proper preparation, not extra turf. Remove old grass and weeds, level the area, add quality topsoil where needed and firm the surface before laying. Good groundwork gives fresh turf the contact it needs to establish well.
Check the roll coverage before ordering
Turf can be supplied in rolls with different dimensions, so always work from the stated coverage per roll or the total square metres required. Do not assume every roll covers the same area just because it looks similar to one you have used before.
Once you have your final square metre figure, divide it by the coverage of each roll if you need to know the roll count. For instance, if a roll covers 1m² and your measured requirement is 44m², you need 44 rolls. If the roll size is different, use that product coverage instead.
Ordering by square metre is often the clearest approach, especially when comparing the lawn plan with a turf calculator. Keep your measurements to hand when placing the order so you can check the figure one final time.
Common measuring mistakes to avoid
The most common mistake is measuring only the longest and widest points of an irregular lawn and treating it as a full rectangle. This can substantially overstate the amount needed when there are large borders or curved sections.
Another is forgetting to add a cutting allowance. Turf may cover the main area on paper, but a few difficult corners can quickly use up the spare pieces. The opposite problem is ordering far too much “just in case”, which can leave unused turf with nowhere suitable to lay it.
Also check whether new edging, a path or widened borders are being installed as part of the same project. Measure the finished lawn area, not the old one. If the garden plan is changing, complete the hard landscaping dimensions first and measure from those final lines.
Plan the delivery around the laying day
A correct measurement is only part of a successful lawn. Have the ground prepared before the turf arrives, with tools, boards and access ready. Avoid stacking rolls on the new lawn, and do not leave them rolled up for longer than necessary.
For gardens across Newcastle, Northumberland and the wider North East, Brunswick Turf can supply fresh-cut turf with fast local delivery and practical support if you are unsure about the quantity. A clear sketch, your lengths and widths, and a few photos of awkward areas can make it much easier to confirm what your job needs.
Take the time to measure carefully, allow sensibly for cuts and arrange delivery for the day you are ready to lay. Your new lawn will look better for it from the first week onwards.