Wheelbarrow of bark mulch and a tape measure beside a garden border

Garden Calculators

Work out exactly what to buy — no more half-empty bags or a second trip to the garden centre.

Pile of bark mulch with a spade and wheelbarrow

Mulch Calculator

How much bark or mulch to cover a border.

Length (m)Width (m)Depth (cm)

Volume needed

0.53 m³

70 litre bags

Compost Calculator

Compost to improve a bed or border.

Length (m)Width (m)Depth (cm)

Compost needed

240 litres

50 litre bags

Topsoil Calculator

Topsoil volume and approximate weight.

Length (m)Width (m)Depth (cm)

Volume

2.70 m³

Approx. weight

3.78 tonnes

Lawn Seed Calculator

Seed for a new lawn or overseeding.

Length (m)Width (m)Sowing rate (g/m²)

Lawn area

60.0 m²

Seed needed

2.10 kg

Timber decking boards and a new fence panel

Fence Calculator

Panels and posts for a fence run.

Fence run (m)Panel width (m)

Panels

Posts

Decking Calculator

Deck boards for your area.

Length (m)Width (m)Board width (mm)

Deck area

12.0 m²

Board rows

Linear metres (+10%)

92.4 m

Paving Calculator

Slabs and sand for a patio.

Length (m)Width (m)Slab size (cm)

Patio area

12.0 m²

Slabs (+5% waste)

Bedding sand

0.96 tonnes

Raised vegetable bed with neat rows of seedlings

Raised Bed Soil Calculator

Soil mix to fill a raised bed.

Length (m)Width (m)Height (cm)

Total fill

1152 litres

Topsoil (70%)

806 litres

Compost (30%)

346 litres

Plant Spacing Calculator

How many plants fill your bed.

Bed length (m)Bed width (m)Spacing (cm)

Rows

Plants per row

Total plants

Water Usage Calculator

Weekly watering for beds and pots.

Area length (m)Area width (m)Water per week (mm)

Litres per week

250 L

9L watering cans