Free calculator
Raised Bed Soil Calculator
Calculate the growing-medium volume needed inside a raised bed, including existing fill where relevant.
Open calculator →Garden project hub
Raised beds & containers
Measure the space the growing medium actually occupies, not the outside footprint of the timber or pot.
Use the right quantity tool
Calculators for raised beds & containers
Plan internal fill volume for raised beds and pots, then move into compost and planting quantities.
Free calculator
Pot & Container Compost Calculator
Calculate compost for round, tapered and rectangular pots using internal dimensions.
Open calculator →Free calculator
Compost Calculator
Estimate compost spread over beds and borders using the area, chosen depth and actual bag size.
Open calculator →Free calculator
Plant Spacing Calculator
Calculate bed planting density and approximate quantities for square, row and staggered layouts.
Open calculator →Free calculator
Garden Sleeper Calculator
Estimate whole sleepers for straight runs, courses and rectangular raised-bed frames, including practical side-by-side counts.
Open calculator →Before you order
Keep the project decisions separate from the arithmetic
Internal dimensions drive fill volume
A raised-bed frame can be 2m long outside but hold slightly less than that internally. Pots can taper towards the base. Those details matter because fill volume comes from the inside space.
Separate the container from the contents
Sleeper Calculator estimates the timber units in a frame. Raised Bed Soil Calculator estimates what goes inside it. Treating construction material and fill volume as separate jobs makes both results easier to verify.
Plant count comes after fill
Once the growing medium and finished level are planned, use the Plant Spacing Calculator with spacing from the plant label, nursery or reliable horticultural guidance.
Supporting guidance
Read the guide when the difficult part is choosing the input
Practical guide
How to Fill a Raised Bed
Plan internal volume, finished level, drainage context and growing-medium choices before ordering fill.
Read guide →Practical guide
How Much Compost for Pots & Containers?
Use internal pot dimensions, taper, fill level and rootball displacement when buying compost.
Read guide →
Practical guide
Plant Spacing Guide
Understand centre-to-centre spacing, plants per square metre and square versus staggered layouts.
Read guide →Continue the project
Useful next routes
Move to the next quantity only when it describes a genuinely different part of the job.
Soil, compost & mulchChoose the material calculator that matches the growing medium you are buying.Planting & spacingPlan the bed layout after the fill volume is settled.Sleeper CalculatorEstimate whole sleepers if the raised bed is being built from timber sleepers.Measurement referenceConvert internal dimensions consistently before multiplying.