Artificial Turf Calculator for Gardens

Calculator

Formula used

• Area (rectangle): A = L × W
• Area (circle): A = π × r² (r = diameter ÷ 2)
• Area (triangle, sides): Heron: s=(a+b+c)/2, A = √(s(s−a)(s−b)(s−c))
• Area (triangle, base/height): A = 0.5 × base × height
• Seam allowance: Extra area = seam length × overlap width
• Waste allowance: Required area = (area + seam extra) × (1 + waste%/100)
• Roll count: Rolls = ceil(required area ÷ (roll width × roll length))
• Infill: kg = area × infill rate
• Base volume: m³ = area × (depth mm ÷ 1000)

How to use this calculator

1. Choose your units and a shape.
2. Enter dimensions (or a custom area for irregular sites).
3. Add a waste factor to cover trimming and offcuts.
4. If you expect joins, enter seam length and overlap width.
5. Set your roll size to match the product you’ll buy.
6. Optionally add base depth, infill rate, and your costs.
7. Click Calculate to see results above the form.
8. Use the Download buttons to save CSV or PDF.

Sizing turf accurately

Accurate sizing starts with reliable measurements. This calculator supports rectangles, circles, triangles, and custom area so you can model patios, play zones, or narrow side yards. For feet inputs, values are converted internally to meters for consistent math. A 10 m by 5 m lawn equals 50.00 m2, while a 6 m diameter circle equals about 28.27 m2. Record dimensions twice to reduce mistakes.

Waste and seam planning

Installation normally needs extra material. A practical waste factor is 5–12% for simple lawns, and 10–18% for curved edges or many obstacles. Seam allowance adds area for overlaps at joins using seam length multiplied by overlap width. For example, 8 m of seams with a 5 cm overlap adds 0.40 m2 before waste is applied. Use higher waste when patterns must align.

Roll strategy and cutting

Roll planning reduces leftover pieces. Roll area is roll width times roll length, and rolls needed are rounded up to a whole roll. Common roll widths are 2.0 m and 4.0 m, with lengths from 10 m to 25 m, but suppliers vary. Try matching the roll width to the shortest site dimension to minimize seams. Document each cut path and keep offcuts for repairs.

Base and drainage quantities

Sub-base estimates help with stable, drainable turf. Base volume equals area times depth, converting millimeters to meters. A 50 mm base over 50 m2 requires 2.500 m3 of compacted aggregate before final leveling. Use deeper bases for soft soils, heavy use, or poor drainage. If you add infill, kilograms are area times infill rate; typical rates range 5–20 kg/m2 depending on product.

Budgeting and procurement checks

Costs become predictable when you separate line items. Turf cost uses required area after waste and seams, while labor is often priced per square meter of site area. Edging is estimated from perimeter when the shape provides it; a 10 m by 5 m rectangle needs 30 m of edging. Add delivery as a fixed fee and compare totals against supplier quotes before ordering final materials.

FAQs

1) What waste percentage should I use for a simple lawn?

For straight edges and few obstacles, 5–12% is typical. If you expect many trims, curves, or tight corners, increase waste to 10–18% to avoid running short.

2) Why does seam length affect turf required?

Seams often need overlap for clean joins. The calculator adds seam length × overlap width as extra area, then applies waste. This helps cover real installation allowance, not just footprint area.

3) How do I choose roll width and length?

Use the supplier’s roll size. Wider rolls can reduce seams but may create more offcuts. Try aligning roll width with the shortest site dimension and plan cuts to reuse leftover strips.

4) What base depth is common for gardens?

Many garden installs use 30–75 mm, depending on soil and drainage. Softer ground, heavy foot traffic, or poor drainage often benefit from deeper bases and careful compaction.

5) How is infill quantity calculated?

Infill kilograms equal site area × infill rate. If your product specifies 10 kg/m2 and the area is 40 m2, the estimate is 400 kg. Set the rate to 0 if none.

6) Can I export results without recalculating?

Yes. After a calculation, the last results are stored in your session. Use the Download CSV or Download PDF buttons to export the same numbers until the session expires.