Calculators

Metric, AUD, done on your phone.

Drainage fall

Fall ratio

Total fall at 1:60

166.7 mm

10 m × 1000 ÷ 60

Educational calculation only. Users must verify minimum grades and requirements against current applicable standards and local authority rules.

Concrete volume

Volume needed

0.200 m³

20kg bags to buy

21

2 m × 1 m × 100 mm ÷ 1000 = 0.200 m³, plus 10% wastage. Bags assume a 20kg premixed bag yields about 0.011 m³ — check the bag.

Educational calculation only. For slabs or footings that carry structure, confirm thickness and mix with an engineer or the manufacturer's instructions.

Markup

Markup amount

$0.00

Selling price

$0.00

This is markup: the percentage is added on top of your cost. It is not profit margin — a 20% markup is a smaller margin on the final price.

Pipe flow rate

Flow rate (full pipe)

7.85 L/s

≈ 471 L/min

Assumes a full, round pipe at steady flow. Real capacity depends on pressure, friction, fittings and pipe material. Verify sizing against current Australian standards and manufacturer data — this is not a sizing tool.

Pipe sizing helper

Smallest common nominal size

DN40

Needs ≥ 35.7 mm inside diameter · velocity at DN40 ≈ 0.80 m/s

Rough guide only. Assumes a round pipe flowing full at steady flow, and that nominal size ≈ inside diameter — actual inside diameter varies by material and wall thickness (copper, PVC, PEX and steel differ). It ignores pressure, friction loss, fittings, pipe length and fixture units. Always verify against current Australian standards (e.g. AS/NZS 3500), manufacturer instructions and local authority requirements before specifying pipework.

Gradient converter

Percent

1.67%

mm per m

16.7

Degrees

0.95°

Conversion only. Minimum grades for drainage must be verified against current applicable standards and local authority rules.

Labour, materials & profit

Method

Profit

$0.00

Charge (excl. GST)

$0.00

Common fittings & materials

Quick reference when estimating. Quantities and sizes are your call — check the job and current standards.

  • Pipe: PVC DWV (DN40–100), copper, PEX — lengths plus 10% waste
  • Fittings: elbows, tees, couplings, reducers, caps — count per direction change
  • Joining: solvent cement & primer, press-fit sleeves, solder & flux
  • Fixings: pipe clips, brackets, anchors — roughly every 1–1.5 m
  • Sealants: thread tape, silicone, rubber grommets
  • Drainage: inspection openings, gullies, grate & channel
  • Consumables: sandpaper, cleaning wipes, lubricant, marker
  • Concrete/bedding: 20kg bags (see calculator above), bedding sand

Job notes