Revenue per Wrench-Hour: The One Number a Mobile Fleet Shop Should Run On

Most shop owners can quote their labor rate instantly. Far fewer can say what an hour of tech time actually brought in last month. Those are different numbers, and the gap between them is where mobile fleet shops quietly lose money.

The definition

Revenue per wrench-hour is total service revenue for a period divided by the total hours your techs worked in that period. Not billed hours. Worked hours, including the drive, the diag that ran long, the comeback, and the small favor job that never got a ticket.

Using worked hours instead of billed hours is the whole point. A shop billing $150 per hour that captures every hour earns $150 per wrench-hour. A shop billing $150 but eating two unbilled hours per tech per day might be earning $90. Same rate sign on the wall, very different business.

How to compute it this week

Take last month's total service revenue, labor and parts margin together if you want the business view, labor only if you want the productivity view. Divide by techs times working days times hours per day. That's it. The precision matters less than tracking the same definition every month.

What moves it

Three leaks pull the number down, and they're the same three at almost every mobile shop:

• Unbilled labor. Diag time that never made the invoice, comebacks done quietly, the second tech on a two-person job who never got recorded.
• Unbilled travel. The miles between jobs are real hours. Many fleet payers reimburse travel under their rules. Shops that don't capture it simply donate it.
• Parts off the invoice. Every part that leaves the shelf without landing on an invoice line is margin you bought and gave away.

If you want a rough dollar figure for your own operation, our revenue leak calculator does the napkin math from your inputs, free and without a signup.

Why this beats the usual metrics

Gross revenue grows when you hire, even if every hire leaks. Average invoice size rewards big jobs, even slow ones. Tech efficiency measured against book time tells you about the tech, not the business. Revenue per wrench-hour is the one number that gets better only when the operation gets better: tighter capture, smarter dispatch, billing that doesn't leak.

That's why it's the number Fleet Portal is built around. One record per job from intake to paid invoice means the hours, the travel, and the parts all land where they should. The metric stops being a monthly forensic exercise and becomes something you can read off the financials tab.