Free calculators for tradies and small business owners.
No ads, no sign-ups, no cookies. Every calculator runs entirely in your browser, and nothing you type leaves your device. Built for Australian businesses.
Markup & Margin Calculator
Convert between markup and margin percentages. See selling price, profit, and GST instantly.
Open calculatorHourly Rate Calculator
Work out what to charge per hour based on your desired take-home, expenses, and super.
Open calculatorConcrete Calculator
Calculate concrete volume for slabs, columns, and stairs. Get bag counts and cost estimates.
Open calculatorPaint Calculator
Work out how much paint you need for walls and ceilings, minus doors and windows.
Open calculatorTile Calculator
Calculate tiles needed for any area with grout spacing, waste allowance, and layout options.
Open calculatorFence Calculator
Get post, paling, rail, and concrete quantities for timber or Colorbond fences.
Open calculatorTimber & Decking Calculator
Calculate boards, joists, and bearers for your deck build with waste allowance.
Open calculatorWhat these numbers assume
Every calculator here gives you a working estimate, not a quote. It is worth knowing what each one takes for granted before you order materials off it.
Australian units and sizes
Metric throughout. Timber lengths, tin sizes, tile boxes and pre-mix bag counts follow what Australian suppliers actually stock, so the totals land on quantities you can walk in and buy.
Waste is visible, not hidden
Each calculator carries a waste allowance you can see and change. The default is an ordinary trade figure rather than a quiet pad, so set it to zero when you are pricing a clean run.
Nothing leaves your browser
The maths runs on your device. No account, no upload and no cookies on any of them. Once the page has loaded it keeps working without a signal, which matters on a site. How we count the visit itself is in our privacy policy.
Where they stop
They size the job. They do not price your labour, your delivery, or the way a supplier packs a pallet. Check the final count against your own quote before you order.
If one of these gets something wrong for the way you work, tell us. We built them, so we can change them.
Calculators are handy. Websites are the day job.
Devalo is a web design studio in Melbourne, building fast, accessible websites for businesses across Australia. Tools like these stay free either way.