TryBuildCalc

Potting Soil & Container Volume Calculator Verification Checklist

Essential Checklist+

Complete these critical checks before approving the work or proceeding to the next construction stage.

✓10 Inspection Points
✓4 Verification Categories
✓Measuring the Container+
  • Every dimension measured on the INSIDE of the container, not the outside
  • Tapered containers measured at BOTH the rim and the base, not just the rim
  • Inside depth measured from the base to the rim, with any moulded false bottom or reservoir accounted for
✓Fill Level & Headspace+
  • Headspace left below the rim rather than filling level with it
✓Mix Volume, Bag Labelling & Ordering+
  • Bag quantity read as DRY quarts, the unit US bag labels actually use
  • Bag size selected matches the bag you will actually buy, in the unit it is labelled in
  • For nursery containers, the class volume range reviewed rather than assuming the trade number is a gallon figure
✓Container Suitability & Drainage+
  • Every container has adequate drainage holes before it is filled
  • Potting mix used, not garden soil or topsoil
  • Filled weight checked against where the container will sit, particularly on a balcony, roof or bracket
Full QC Checklist+

Verify how the containers were measured, the fill level and headspace, reading bag labels correctly and ordering, container suitability and drainage, and planting and aftercare.

✓24 Inspection Points
✓5 Verification Categories
✓Measuring the Container+
  • Every dimension measured on the INSIDE of the container, not the outside
  • Tapered containers measured at BOTH the rim and the base, not just the rim
  • Inside depth measured from the base to the rim, with any moulded false bottom or reservoir accounted for
  • Hanging basket depth measured at its centre, its deepest point
  • Container count per row checked against the containers you actually have, including any you plan to add
✓Fill Level & Headspace+
  • Headspace left below the rim rather than filling level with it
  • Headspace checked as a SHARE of each container's depth, not applied as one figure across very different containers
  • Settling and top-up allowance included, so you are not topping up from an empty bag
  • For containers entered by class number, the fill percentage reviewed rather than left at the default
✓Mix Volume, Bag Labelling & Ordering+
  • Bag quantity read as DRY quarts, the unit US bag labels actually use
  • Bag size selected matches the bag you will actually buy, in the unit it is labelled in
  • Bag count understood as whole bags rounded up, with leftover expected
  • Bag volume understood as the labelled volume, not the volume after it loosens
  • For nursery containers, the class volume range reviewed rather than assuming the trade number is a gallon figure
  • Cost compared per unit volume across bag sizes, not per bag
✓Container Suitability & Drainage+
  • Every container has adequate drainage holes before it is filled
  • No gravel or crock "drainage layer" added at the base
  • Potting mix used, not garden soil or topsoil
  • Filled weight checked against where the container will sit, particularly on a balcony, roof or bracket
  • Container depth suits what you intend to grow
✓Planting & Aftercare+
  • Mix moistened before planting rather than filled dry and watered afterwards
  • Mix firmed lightly, not compacted
  • Container topped up after the first thorough watering, keeping the headspace
  • A deliberate decision made about reusing last season's mix, and the volume adjusted if you do
Inspection Notes+
Use the latest approved drawings, specifications, and site measurements.
Complete all critical checks before proceeding to the next work stage.
Record deviations and confirm rectification where required.

Related Calculators & Guides

Potting Soil & Container Volume Calculator CalculatorOpen the related calculator and verify the current project inputs.

FAQ

Use it after collecting the project inputs and again before approving or closing the relevant work stage.
No. It supports verification but does not replace approved drawings, specifications, codes, manufacturer requirements, or professional inspection.