← Fire Extinguisher Inspection Route Margin Calculator
This calculator vs. ranking sites by extinguisher count
Names no specific product or company. This compares a free calculator against the generic habit every route operator already has: sorting sites by extinguisher count and treating the biggest counts as the best stops.
First — extinguisher count is not useless
A route list sorted by unit count is real information: it tells you roughly how much a visit will bill on its guaranteed inspection and tag fees, and a site trending toward zero units is a genuine problem worth acting on. Nothing below argues for ignoring that count. What it argues is that count alone cannot answer the next question — which of these sites is actually worth keeping — because count only sets the guaranteed part of the visit, and everything else is set by what the units actually need and how far you have to drive.
The worked example
Both sites below carry the identical 18 extinguishers and the identical $9 inspection / $2.50 tag fees this visit — so an extinguisher-count ranking would place them side by side. What differs is how many units need a recharge, a hydrostatic test, or a replacement, and how far the drive is.
| Figure | Site A — 25% recharge / 10% hydro / 5% replace, 14-min drive | Site B — 5% recharge / 2% hydro / 1% replace, 75-min drive |
|---|---|---|
| Extinguishers on the schedule | 18 | 18 — identical |
| Inspection + tag revenue | $207.00 | $207.00 — identical |
| Total visit revenue | $567.90 | $279.18 |
| Recharge / hydro / replacement materials | $162.00 | $38.16 |
| Mileage cost | $4.02 (6 mi) | $25.46 (38 mi) |
| Your labor | $45.87 (1.43 hrs) | $78.40 (2.45 hrs) |
| Profit on the visit | $356.01 | $137.16 |
| Net monthly profit | $21.67 (45.8% margin) | $3.43 (14.7% margin) |
| Effective hourly rate | $181.40/hr | $16.80/hr |
Every figure above is this calculator's own arithmetic on the two site profiles described, not a claim about any real route or an industry benchmark. Your fees, service mix, and drive times will produce different numbers — the point is which numbers to check, not what they should come out to.
The two places an extinguisher-count ranking goes quiet
1. It cannot see the service mix behind the count
A schedule that lists "18 extinguishers" has one column. It cannot show that Site A's units need five times the recharge, hydro-test, and replacement work Site B's do — work that bills at a fee well above its own materials cost, so a heavier mix on the identical unit count is more profit, not more of the same job. Two sites that look identical on a count-sorted list can be running completely different amounts of billable work per visit.
2. It cannot see the drive
Mileage and labor cost scale with the trip to the site, not with how many units are on the schedule once you arrive. Site B's 75-minute, 38-mile round trip costs more than six times Site A's 14-minute, 6-mile one, on the same unit count — a real monthly cost an extinguisher count never states, and most of the gap between Site A's $21.67 profit and Site B's $3.43 on the same 18 units.
When ranking by count is still the right first check
Watching how many extinguishers are on a site's schedule is still the cheapest way to catch a customer shrinking or a building emptying out, and it needs no calculator. The point at which count stops being enough is when you are deciding which sites to keep, drop, or re-route — that decision needs the service mix and the drive behind each stop, which is what this calculator prices per site before rolling the whole route up against a monthly income goal.
Common questions
Is extinguisher count a bad way to judge a site?
Not on its own terms — it tells you roughly how much a visit will bill, which is real information. The problem is using it as a stand-in for profit. Two sites with the identical 18 extinguishers on the schedule can land far apart once the recharge, hydrostatic-test, and replacement mix and the drive to reach the site are counted, and a schedule that only lists unit counts has no way to show that.
How can two sites with the same extinguisher count net such different profit?
Because unit count only sets the guaranteed part of the visit — the inspection and tag fees. Everything else is set by what the units actually need and how far you have to drive, not by the count. On this calculator's own worked example, both sites bill the identical $207.00 in inspection and tag revenue from 18 units. One has a heavier recharge/hydro/replacement mix and a 14-minute drive and nets $21.67 a month at an $181.40 effective hourly rate. The other has almost none of that work and a 75-minute drive and nets $3.43 a month at $16.80 an hour.
Which sites does this catch that an extinguisher-count ranking misses?
The ones a route list ranks in the middle or even near the top by unit count, because it sorts by units on the schedule, not by what those units actually need or how far the drive is. An operator dropping the lowest-count sites to trim a route can pass right over a large-count site that is barely worth the drive, and keep a smaller one that pays better per hour.
Does this replace keeping track of extinguisher counts?
No. Extinguisher count is still the number that sets the guaranteed inspection and tag revenue, and a site trending toward zero units is a real problem this calculator does not need to tell you about. What it adds is the number count cannot produce on its own: whether a site is actually profitable once the service mix and the drive behind it are priced in.
Open the Fire Extinguisher Inspection Route Margin Calculator to price your own route.