Contractor Hourly Rate Calculator: What You Should Actually Be Charging
Most tradies going out on their own get this wrong. They look at what their old boss was paying them, add a bit on top, and call it a rate. Then six months later they’re wondering why they’re working more hours than ever and somehow still behind on bills.
A contractor hourly rate calculator isn’t just a nice-to-have — it’s the difference between a trade business that works and one that slowly bleeds you dry. Let’s break down exactly how to calculate your rate, what goes into it, and what most people leave out.
Why Your Old Pay Rate Is the Wrong Starting Point
If you were on $45/hr as an employee, you might think charging $55 or $60 as a contractor is fair. It’s not. Not even close.
As an employee, your employer was covering a stack of costs you never saw on your payslip:
- Superannuation (11.5% on top of your wage)
- Workers compensation insurance
- Annual leave and sick leave loading
- Public holidays
- Tools and equipment
- Training and licensing costs
When you go contractor or start your own trade business, every one of those costs lands directly on you. And if your rate doesn’t account for them, you’re effectively working for less than you were before — you just don’t see it until tax time.
This is exactly why using a subby to salary calculator before you set your rate is so important. It converts your old employee salary into what you’d actually need to earn as a contractor to come out the same — and in most cases, the number is significantly higher than people expect.
The Real Components of a Contractor Hourly Rate
A proper contractor hourly rate calculation has four layers. Get all four right and your business is sustainable. Miss any one of them and you’re just creating expensive problems for future you.
1. Your Base Labour Cost
Start with what you actually need to take home — not what you want, what you need. Rent or mortgage, food, family expenses, fuel. This is your floor. Everything else gets built on top of it.
2. Business Overhead
Every trade business has running costs that don’t disappear when you’re not on the tools. Add up your annual costs and divide by your billable hours:
- Insurance (public liability, tools, vehicle, income protection)
- Accounting and bookkeeping
- Software subscriptions (quoting, scheduling, invoicing)
- Phone, internet, and admin costs
- Vehicle registration and maintenance
- Tool replacement and servicing
- Marketing and website
Most tradies underestimate this by 30-40%. A rough rule of thumb: your overhead adds at least $8-15/hr to your required rate, often more.
3. Non-Billable Time
You don’t bill 40 hours a week. Nobody does. Quoting, invoicing, chasing payments, travel, picking up materials, dealing with suppliers — all of that eats into your week. If you’re billing 28-32 hours out of a 45-hour week, that’s realistic. If you’re calculating your rate based on 40 billable hours, you’re already in the hole.
Take your actual billable percentage and factor it in. If you’re only billing 70% of your hours, your rate needs to be high enough to cover the other 30% of your time where no money is coming in.
4. Profit Margin
This is the one most sole traders skip entirely. Your rate should include a profit margin on top of covering your costs — not just break even. Profit lets you reinvest in the business, upgrade equipment, build a buffer, and eventually get to a point where you’re not trading every hour of your time for money.
A minimum of 15-20% net margin is reasonable for most trade businesses. If you’re not hitting that, you’re running a charity, not a business.
How to Use a Contractor Hourly Rate Calculator
The fastest way to land on a defensible rate is to run your numbers through a calculator that’s built for tradies — not a generic freelance pricing tool that doesn’t understand how trade businesses actually work.
The Advanced Tradie Calculator on Boss Tradie walks you through each of these components and spits out a minimum viable hourly rate. Plug in your actual numbers — not what you hope they are — and you’ll have a rate that actually covers your costs.
Once you’ve got that floor rate, add your margin on top. That’s your quote rate. The floor rate is the number below which you shouldn’t accept work — not a number you advertise.
Contractor Rates by Trade in Australia
Subcontractor pay rates vary a fair bit depending on trade, location, and the type of work. As a rough guide for Australia in 2026:
- Electricians: $80–$130/hr depending on licence level and specialisation
- Plumbers: $90–$140/hr
- Builders and carpenters: $65–$110/hr
- HVAC/refrigeration: $85–$130/hr
- Concreters: $60–$95/hr
- Painters: $55–$85/hr
These are contractor rates — not subby-to-principal rates. If you’re working as a subie under a builder or principal contractor, the rate you negotiate needs to account for the fact that the principal is clipping the ticket on your labour. Factor that into your calculator.
Don’t benchmark yourself solely against these numbers. Your rate should come from your costs first, then cross-check against market rates. If your cost-based rate is higher than market, you need to either find efficiencies or target higher-margin work. If it’s lower, that’s a sign you may be undervaluing your time.
Casual Loading and Its Impact on Your Rate
If you’re picking up casual work alongside contracting — or if a builder is bringing you on as a casual rather than a subcontractor — casual loading changes the equation. In Australia, casual employees attract a 25% casual loading on top of the base rate to compensate for the lack of leave entitlements.
This is important for two reasons:
- If you’re being offered casual employment instead of a contract arrangement, you should be factoring that 25% into your rate negotiation
- If you’re hiring casuals yourself, your cost per hour is 25% higher than their base rate before you even add super and insurance
Use the subby to salary calculator to model these different employment and contracting scenarios side by side. It’s a quick way to see which arrangement actually puts more money in your pocket once all the real costs are counted.
Common Mistakes Tradies Make When Setting Their Rate
After talking to hundreds of tradies and looking at the numbers, the same mistakes come up again and again:
- Rounding down to win work. Undercutting yourself to close a job feels like smart sales. It’s not. It trains clients to expect a lower rate and locks you into low-margin work.
- Forgetting GST. Your rate and your GST-exclusive rate are two different numbers. Know which one you’re quoting.
- Not reviewing annually. Costs go up. Your rate should too. If you haven’t reviewed your rate in 18 months, you’ve probably already had a pay cut.
- Confusing revenue with profit. Turning over $200k doesn’t mean you’re profitable. Know your numbers.
- Setting a rate based on what mates charge. Your costs aren’t their costs. Your rate needs to be based on your specific situation.
Get Your Rate Right — Start Here
Setting your contractor hourly rate isn’t something to do based on gut feel or a quick Google of what other tradies charge. It’s a calculation, and it needs to be based on your actual costs, your actual hours, and the margin you need to build a business worth having.
The tools are here. The Advanced Tradie Calculator and the Subby to Salary Calculator are both free, built specifically for Australian trade businesses, and will give you a rate based on real numbers — not guesswork.
Run the numbers before you quote your next job. It takes five minutes and it might be the most valuable five minutes you put into your business this month.