Free Backflow Testing Calculators

Free Backflow Testing Calculators
for Backflow Testers

Standards-compliant calculators for backflow testers in NZ & Australia. Free, no signup required. Works on mobile.

Trade

Country

🇳🇿 New Zealand🇦🇺 Australia

Typical Electrician rate: NZD $85–$130/hr excl. GST (15%)

Desired annual take-home (NZD)

Income tax rate (%)

Check IRD for your bracket.

Billable weeks per year

Billable hours per week

Target profit margin (%)

10–20% is typical for a sole trader.

Total annual overhead

Backflow Testing Calculators

Dedicated calculators for backflow testers. Bookmark the ones you use most.

Check field test readings against AS/NZS 2845.1 pass/fail criteria for RP assemblies, DCV and PVB devices.