Turf Roll Calculator
Work out how many turf rolls to order from your lawn measurements, supplier roll size, trimming allowance, pallet size and delivery cost.
Measure The Lawn And Roll Size
Your Turf Roll Order
Enter the lawn and roll measurements to see the order quantity.
What Makes This Result Specific
Measure The Lawn Before Ordering Turf
A turf order starts with the prepared soil area, not with the old grass line, the paving edge you hope to cover, or the estate agent description of the garden. Measure the area that will actually receive turf after weeds, stones, humps, dips and old lawn have been dealt with. For a square or rectangular lawn, length multiplied by width is enough for the main area. For an L-shaped garden, split the space into rectangles, write each area on a sketch, then add the pieces together. For a curved bed or border, measure the nearest rectangle and use the extra area field for patches that sit outside the main rectangle.
The calculator is set up for real turf rolls rather than a vague square metre estimate. A roll may be sold as 1 m2, or the supplier may state a length and width that produce a slightly different coverage. Enter the roll length and roll width from the product page, label or quote. If a supplier sells by square metre but still delivers rolls, set the roll dimensions so their product gives the correct roll area. A small change in roll coverage can alter the final roll count because the calculator rounds up to whole rolls.
Formula And Rounding Method
base lawn area = length x width + extra measured area
roll area = roll length x roll width
order area = base lawn area x (1 + trimming allowance / 100)
rolls before rounding = order area / roll area
rolls to order = rolls before rounding, rounded up to the next whole roll
spare area = rolls to order x roll area - base lawn area
estimated cost = rolls to order x price per roll + delivery or collection cost
The rounding is deliberate. Turf cannot usually be ordered as 43.2 rolls, and running short by one roll is awkward because turf colour, harvest date, moisture and thickness can vary between deliveries. The calculator shows both the theoretical roll count and the order count so you can see how much rounding has been added. If the spare area looks too high, check the roll size, then consider reducing waste only if the lawn is genuinely simple.
Turf Roll Worked Examples
| Case | Inputs | Estimated Order | Why The Result Looks That Way |
|---|---|---|---|
| Small square lawn | 5 m by 4 m, no extra area, 1 m2 rolls, 5% trimming. | 21 rolls. | The measured area is 20 m2. A 5% allowance lifts the order area to 21 m2, so the rounded order is 21 rolls. |
| Family lawn with beds | 8 m by 5 m, 2 m2 extra strips, 1 m2 rolls, 8% trimming. | 46 rolls. | The base area is 42 m2. Shaped borders add cutting waste, giving 45.36 m2 before rounding. |
| Narrow side repair | 12 m by 1.2 m, 1 m2 rolls, 12% trimming. | 17 rolls. | The long narrow strip creates many cut ends. The waste setting matters more than it would on a plain rectangle. |
| Supplier roll is not 1 m2 | 40 m2 base area, 2.4 m by 0.4 m rolls, 7% trimming. | 45 rolls. | Each roll covers 0.96 m2, so the order count is higher than a headline square metre estimate suggests. |
Choose A Waste Allowance That Matches The Garden
Waste is not only wasted grass. It covers trimming around beds, cutting staggered joints, replacing damaged edges, matching the last row, and allowing for a small measuring error. A neat square lawn beside a straight patio can use a small allowance because most rolls are laid almost full length. A lawn with a curved border, stepping stones, a tree circle, a shed corner or a narrow passage needs a higher allowance because more pieces are cut and fewer offcuts fit the next gap.
| Lawn Situation | Typical Allowance | Practical Note |
|---|---|---|
| Plain rectangle, straight edges, clear access | 5% | Still round up to full rolls and check the final strip width before ordering. |
| Rectangle with one shaped bed or path | 7% to 8% | Useful when several rolls will be cut but the main area is regular. |
| Curves, stepping stones or several repair patches | 10% to 12% | Cutting losses rise because offcuts may not match the next opening. |
| Contractor work with big rolls | Supplier led | Big rolls and lifting gear change handling, joints and order planning. Use the contractor or grower figures. |
Before The Delivery Arrives
1Prepare the soil first. Turf is perishable, so the ground should be level, firmed, free of weeds and ready for laying before the rolls arrive.
2Plan the first row. Start from a straight edge where possible and stagger joints so the lawn is not built from a line of matching joins.
3Water promptly. Rolled turf can dry quickly, and watering after laying is part of the order plan, not an afterthought.
The calculator does not price soil preparation, topsoil, fertiliser, skip hire, tool hire, labour, watering equipment or disposal of the old lawn. Those items can cost more than the turf on a neglected garden. Treat the roll result as the material take-off for the turf itself, then build a separate preparation list. If the site is badly compacted, shaded, uneven or poorly drained, a lower roll price will not fix the ground problem.
Using The Result With A Supplier Quote
When you compare suppliers, make the units match. One quote may state price per roll, another price per m2, and another supply-and-lay price with preparation excluded. The result panel gives the measured area, order area, roll area and roll count so you can convert each quote to the same basis. If a supplier has a minimum delivery amount, pallet charge or timed delivery fee, add that separately to the delivery field or record it on your order sheet.
The spare area is not a mistake. It is the difference between the amount of turf bought and the measured lawn before waste. Spare pieces can help with small edge repairs during laying, but they are not a long-term stock item. Turf left rolled for too long deteriorates, so do not order a large surplus just because the calculator can display one.
When This Calculator Is Not Enough
Use this page for turf quantity, roll rounding, pallet planning and a simple material cost estimate. It does not approve drainage, levels, soil depth, sports pitch construction, artificial grass installation, retaining edges, irrigation, site safety or contractor method statements. If the job is large, sloped, newly built, heavily shaded or tied to a warranty, ask the grower, supplier or contractor to confirm the specification before ordering.
FAQs
How many turf rolls do I need for a 40 m2 lawn?
If each roll covers 1 m2 and you use a 7% trimming allowance, the order area is 42.8 m2, so you would round up to 43 rolls. If the supplier roll covers less than 1 m2, the calculator will show a higher roll count.
Should I measure the old lawn or the prepared soil?
Measure the prepared soil area. Old lawn edges can be uneven, and the final turfed area may change after edging, levelling, removing weeds or adjusting borders.
Is 5% waste enough for turf?
It can be enough for a simple rectangle with straight edges. Use a higher figure for curves, strips, awkward corners, many cuts or repair patches where offcuts are less likely to fit the next gap.
Why does the calculator ask for roll length and width?
Some products are sold as 1 m2 rolls, but not every supplier uses the same dimensions. Length and width let the page calculate the actual roll area instead of assuming that every roll covers exactly 1 m2.
Can I use this for artificial grass?
No. Artificial grass is usually ordered from wider rolls, cut to length, and may need joining tape, adhesive, sub-base, edging and pile direction checks. Use a separate artificial grass estimator for that job.
Does the result include topsoil or lawn dressing?
No. The result is for turf rolls only, with optional delivery and price per roll. Topsoil, compost, fertiliser, levelling material and tools need their own quantities.
Sources
- Royal Horticultural Society. (n.d.). How to Lay Turf. RHS. https://www.rhs.org.uk/lawns/lawns-from-turf
- Turfgrass Growers Association. (2020). General Landscaping: Sourcing and Laying of Cultivated Turf for Use in General Landscaping. Turfgrass Growers Association. https://turfgrass.co.uk/2020/10/02/general-landscaping-sourcing-and-laying-of-cultivated-turf-for-use-in-general-landscaping/
- National Institute of Standards and Technology. (2019). The International System of Units (SI). NIST Special Publication 330. https://www.nist.gov/pml/special-publication-330