Choose the right calculator
Using leftover compost for module trays
Enter usable loose stock, tray capacity and bag litres to compare complete trays now with purchases for the target.
Covering the top of a garden bed
Enter surface dimensions and the depth of the mulch layer. Compare bags with a bulk cubic-yard order.
Filling a rectangular raised bed
Use the inside dimensions and the remaining fill depth. A top-up needs only the depth of new soil.
Filling or repotting several identical pots
Use empty-pot dimensions or measured fresh compost per pot. Combine the target, deduct usable stock and buy the remaining whole bags.
Arranging plants in aligned rows
Set center spacing along each row, an optional different distance between rows and a minimum edge margin. Length runs along rows; width runs across them.
Put the numbers to work
Material volume and watering requirements are different questions. The irrigation tool estimates delivered water; it does not prescribe what a plant needs.