How to Calculate Labour Costs at Your Petrol Station

Most petrol station operators can tell you their fuel margin to the cent. Ask them their labour cost as a percentage of revenue and you will get a shrug. That asymmetry is expensive. Labour is typically the second largest cost in a servo after product, and unlike fuel margins, it is something you can actually control. Here is how to calculate it properly and where most operators are getting it wrong.

What counts as a labour cost

This is where most operators undercount. Labour cost is not just the hourly rate you pay your staff. It is the total cost of having someone on your payroll.

• Base wages. The hourly rate for the classification and shift type under the relevant award.
• Penalty rates. Evening, weekend, and public holiday loadings under the Vehicle Repair, Services and Retail Award can push effective hourly rates significantly above base.
• Casual loading. 25% on top of base rate for casual employees before penalties are applied.
• Superannuation. Currently 11.5% of ordinary time earnings, on top of wages, not included in them.
• Leave entitlements. Annual leave and personal leave accruals for permanent staff represent a real cost even when staff are not taking leave right now.
• Workers compensation premium. Varies by state and industry classification, but for petrol station workers it is a meaningful line item.

As a working estimate: a staff member on a $25 base hourly rate costs you closer to $31 to $33 per hour once super, leave loading, and oncosts are factored in. If they are working a Saturday afternoon as a casual, that number goes higher again. The gap between what operators think they are paying and what they are actually paying is often 20% or more.

The formula most operators are missing

The standard labour cost formula is straightforward:

Labour cost percentage = total labour cost / total revenue x 100

The problem is the denominator. Most servo operators use gross fuel turnover as their revenue figure. On a site turning over $3 million a year in fuel, that makes your labour cost look tiny as a percentage. But most of that revenue is product cost. The fuel margin on a $3 million turnover site might only be $150,000 to $200,000.

A more useful calculation uses gross profit, meaning revenue minus cost of goods: fuel margin plus convenience margin plus any other income. If your gross profit is $600,000 and your total labour bill is $180,000, your labour cost is 30% of gross profit. That is a number you can benchmark and manage.

What a healthy labour cost percentage looks like for a servo

There is no universal right answer, because it depends heavily on your trading hours, whether you have a food offer, and how much of the work you or family members cover personally. But as a rough guide:

• 18 to 22% of gross profit is lean. Common for unmanned or partially unmanned sites, or operators who personally cover significant hours.
• 25 to 35% is typical for a standard convenience servo with full staffing across all trading hours.
• 35% and above is common for sites with a food offer, longer hours, or specialist staff. If you are here without a food offer, it is worth investigating where the hours are going.

If you have never calculated this before, do it for last month. The number itself is less important than tracking how it moves over time. A percentage that is creeping up quarter by quarter is a signal worth acting on.

Where the hidden costs blow out your numbers

Beyond the base calculation, there are a few places where servo labour costs habitually blow out without operators noticing.

• Unplanned overtime. A staff member who regularly works 30 minutes past their shift end is earning 150% of their base rate for those extra minutes. Across a fortnight, that adds up. Across a year, it is a significant hidden cost.
• Public holiday miscalculation. Many operators are not applying the correct penalty rates on public holidays. Whether you are over or underpaying, both create problems. One is a compliance risk, the other is a margin leak.
• Manual timesheet errors. Research suggests manual timesheets contain errors worth 2 to 5% of total payroll. On a $200,000 annual labour bill, that is $4,000 to $10,000 in overpayments or underpayments every year.
• Owner hours not costed. If you are covering shifts yourself, your labour cost looks artificially low. For a true picture of whether the site is viable with paid staff, cost your own hours at the market rate for the role you are filling.

How to track labour costs without a spreadsheet

You do not need an accountant or a complex system to stay on top of this. You need three things working together.

First, a roster that shows wage cost by shift. Before you publish each week, you want to know what the total wage bill is, not discover it at payroll.

Second, accurate clock-in data. If timesheets are built from actual clock-in records rather than memory or paper, your hours data is reliable. That reliability is what makes the cost calculation meaningful.

Third, a simple weekly or fortnightly actuals report. Rostered cost versus actual cost, by site. If those two numbers are diverging, you want to know why before it becomes a pattern.

When those three things are connected, labour cost management stops being a surprise and starts being a lever you can actually pull.