Planting
Plant Spacing Calculator
How many plants fit a bed at a given spacing, in grid or triangular layout.
plants = (usable length ÷ spacing + 1) × …
Also called how many plants per square meter · planting density calculator
Garden, Farm & Pets · 6 calculators
Planting Calculators
Plant and row spacing, number of plants per bed, seed quantities, raised beds, pot sizes, soil and water needs.
Planting
Seed Quantity Calculator
Seeds needed for a planting area, allowing for germination rate and thinning.
seeds = plants wanted ÷ germination rate …
Also called how many seeds do i need · seed packet calculator
Planting
Raised Bed Soil Calculator
Soil mix for raised beds, split into topsoil, compost and drainage material.
volume = length × width × height × fill l…
Also called raised bed calculator · garden bed soil
Planting
Pot Volume Calculator
Compost needed to fill plant pots of any shape and size.
Tapered pot: V = πh(r₁² + r₁r₂ + r₂²) ÷ 3
Also called plant pot size calculator · container volume
Planting
Soil Volume Calculator
Topsoil or compost needed for a bed or area, in cubic metres, bags and tonnes.
volume = area × depth × (1 + settlement)
Also called topsoil calculator · how much soil do i need
Planting
Watering Calculator
Water needed for a garden or lawn, per session and per week.
litres = area × millimetres needed (1 mm …
Also called garden watering calculator · how much to water plants
Key planting formulas
| Plant Spacing | plants = (usable length ÷ spacing + 1) × (usable width ÷ row spacing + 1) |
|---|---|
| Seed Quantity | seeds = plants wanted ÷ germination rate × (1 + thinning) |
| Raised Bed Soil | volume = length × width × height × fill level × beds |
| Pot Volume | Tapered pot: V = πh(r₁² + r₁r₂ + r₂²) ÷ 3 |
| Soil Volume | volume = area × depth × (1 + settlement) |
| Watering | litres = area × millimetres needed (1 mm over 1 m² = 1 litre) |