Built for Australia
Calculators that get the Australian numbers right
107+ free calculators for pay, tax, brewing and everyday maths — no sign up, no naked tools, every Australian rate sourced and dated.
Browse by category
Australia-specific calculators, plus tools that work the same anywhere in the world.
Australia
Pay, Contractor and Work
Work out contractor pay, ABN take home income, casual loading, penalty rates and pro rata salary under current Australian pay rules.
10 calculators →Tax and GST
Australian income tax, GST and HECS-HELP repayment calculators, kept current against ATO thresholds each financial year.
33 calculators →Savings, Interest and Investing
Compound interest, term deposit and capital growth calculators for Australian savers and investors.
2 calculators →Property and Real Estate
The real cost of buying, selling and holding Australian property, state by state.
3 calculators →Education and Study
Selective school, ATAR, WAM and HSC calculators built around Australian education systems.
4 calculators →Building, DIY and Energy
Building, renovation and energy calculators using Australian units and prices.
1 calculator →Works anywhere
Maths
Percentages, statistics, fractions, ratios and unit conversions — maths that works the same everywhere.
40 calculators →Brewing
ABV, dilution, priming sugar and carbonation calculators for home brewers, distillers and winemakers.
10 calculators →Fitness
One rep max, DOTS score and other training calculators for lifters and athletes.
2 calculators →Everyday
Quick everyday calculators for dates, time and unit prices while you shop.
2 calculators →Most searched calculators
Every rate sourced. Every calculator dated.
OneCalculate is built and maintained by Nirbhay Tripathi. Tax, pay and duty figures are checked against the ATO, Fair Work Ombudsman and state authorities and reviewed every 1 July — see ourmethodology for the full update calendar.