Two countries. Two sets of rules. Never mixed.
Calculators that use your country's numbers
Most calculators you find are American, or they are one generic tool with a flag pasted on. These are not. The Australian section uses ATO thresholds, Fair Work entitlements and Australian Standards. The New Zealand section uses IRD brackets, the Holidays Act and NZ Building Code figures. Nothing is shared between them except the arithmetic.
Nothing matched that. Try a shorter word — or browse Australia or New Zealand.
Most used right now
Five from each country — two full rows, no gaps.
Annual leave
Leave accrued under the NES, for full-time or any part-time pattern.
Open calculator AU · Trade & constructionConcrete
Cubic metres, 20 kg bags and ready-mix loads for slabs, footings and post holes.
Open calculator AU · Health & nutritionkJ to calories
Kilojoules to calories and back, with Australian daily intake context.
Open calculator AU · Trade & constructionMulch
Cubic metres and bag counts for any garden bed, at the depth that actually works.
Open calculator AU · AutomotiveL/100km
Real fuel consumption from a tank fill, plus conversion to and from MPG.
Open calculator NZ · Tax & inflationIncome tax
Take-home pay after tax, ACC levy, KiwiSaver and student loan.
Open calculator NZ · Construction & tradeDecking
Boards, joists and fixings for a New Zealand deck, with wastage allowed for.
Open calculator NZ · Business & datesWorking days
Working days with NZ public holidays, Mondayisation and regional anniversary days.
Open calculator NZ · Power & utilitiesPower cost
What an appliance costs to run, at the rate on your own bill.
Open calculator NZ · Construction & tradeCubic metres
Cubic metres from any dimensions, with litres, cubic feet and material tonnage.
Open calculatorEvery calculator on the site
324 calculators across 26 sections. Australian tools use Australian rules, New Zealand tools use New Zealand rules, and the two never mix.
Education
ATAR aggregate, HECS-HELP repayments, and university WAM and GPA averages.
View section AU · 22 calculatorsEmployment & leave
Annual leave, sick leave and personal leave under the National Employment Standards.
View section AU · 10 calculatorsMaths & geometry
Volume, slope, surds and pi — with the working shown, not just the answer.
View section AU · 10 calculatorsHealth & nutrition
Energy and nutrition, due dates, standard drinks, BMI and pregnancy.
View section AU · 3 calculatorsPets
Canine gestation dates and the milestones along the way.
View section AU · 23 calculatorsTrade & construction
Concrete, mulch, pavers, tanks, ramps, stairs and gas struts — in metric, to Australian standards.
View section AU · 4 calculatorsAutomotive
Fuel consumption in litres per 100 km, and what a trip actually costs.
View section AU · 34 calculatorsFinance & property
Home loans, investment property cash flow, capital growth, debt recycling, novated leases and SMSF borrowing.
View section AU · 37 calculatorsTax & government
Income tax, GST, land tax, luxury car tax, redundancy tax and vehicle registration.
View section AU · 1 calculatorImmigration
Scoring a skilled visa application against the points test.
View section AU · 1 calculatorCraft & sewing
Circle skirt radii and the fabric a pattern actually needs.
View section AU · 2 calculatorsRecreation
Snowboard length from height, weight, boot size and riding style.
View section AU · 1 calculatorMarketing
Return on ad spend, and the break-even point most ROAS tools skip.
View section AU · 13 calculatorsBusiness
ABN and TFN checking, GST tax invoices, quotes and business name ideas.
View section AU · 4 calculatorsHome energy
Solar payback and what your electricity bill is made of.
View section AU · 26 calculatorsOnline tools
Image, PDF, audio and text tools, QR codes, passwords and SEO helpers that run in your browser.
View sectionTax & inflation
PAYE take-home pay, tax refunds, student loans, GST, the ACC levy, bright-line tax and inflation.
View section NZ · 8 calculatorsHealth & medical
Due dates, alcohol limits, kidney function and kilojoule conversion.
View section NZ · 27 calculatorsFinance & business
Mortgage repayments, rental yield, KiwiSaver contributions and retirement projections.
View section NZ · 8 calculatorsMaths
Plotting a function, and working out a gradient.
View section NZ · 15 calculatorsConstruction & trade
Decking, paint, tiles, fences and other building quantities for New Zealand jobs.
View section NZ · 9 calculatorsBusiness & dates
Working-day counts, IRD and NZBN number checking, and GST invoices.
View section NZ · 5 calculatorsPower & utilities
Home electricity use, heat pump sizing and firewood for the season.
View section NZ · 15 calculatorsEmployment & leave
Minimum wage, holiday pay, annual and sick leave, public holiday pay, salaries and timesheets.
View section NZ · 26 calculatorsOnline tools
Image, PDF, audio and text tools, QR codes, passwords and SEO helpers that run in your browser.
View section NZ · 2 calculatorsPets
Dog and cat age in human years, and what each life stage means.
View sectionWhy the two countries are kept apart
It is tempting to build one calculator and let a dropdown swap the country. It is also how you end up telling a New Zealander that their blood alcohol limit is measured the Australian way, or quoting an Australian tradesperson a joist spacing from the New Zealand Building Code.
The two markets look similar and are not. Australia's alcohol limit is expressed as a blood alcohol concentration; New Zealand's legal test is a breath alcohol figure in micrograms per litre, with a separate zero limit for drivers under 20. Annual leave in Australia comes from the National Employment Standards and accrues progressively; New Zealand's comes from the Holidays Act 2003 and lands as a lump entitlement at twelve months. Same idea, genuinely different rules.
So each section is written as though the other did not exist. Where two calculators genuinely share the same arithmetic — converting kilojoules to calories, for instance — the maths is written once, but the page around it is written twice.
What every calculator here does
- Shows the formula it used, not just the answer
- Names the authority behind any published rate, with a link
- Carries the date that rate was last checked against the source
- Works through one example with real numbers
- Runs entirely on your device — nothing you type is sent anywhere
- Costs nothing, needs no account, and shows the result without an email