← Fire extinguisher inspection route margin calculator
Most route operators judge a small account by the service ticket: the visit took an hour, it billed ninety dollars, it was fine. That reading is right about the day and wrong about the year. Certified fire-extinguisher maintenance under NFPA 10 is an annual visit — you earn that ticket once — while the recordkeeping you carry for that customer's inspection history bills every month. Those two clocks are what decide whether a small site is worth keeping, and a service ticket cannot show them.
Open the free route margin calculator
Take a small office with 6 extinguishers, priced the way a typical route prices them: a $9 inspection fee and a $2.50 tag fee per unit, 20% of units needing a recharge, 8% due for hydrostatic testing, 4% replaced outright, 4 minutes on-site per unit, a 24-minute round trip covering 9 miles at $0.67 a mile, your own time valued at $32 an hour, and $8 a month to keep that customer's inspection records.
| Figure | Value |
|---|---|
| Visit revenue | $165.24 |
| Materials (tags, recharge, hydro, replacement) | $43.68 |
| Mileage | $6.03 |
| Your labor (0.80 hrs at $32/hr) | $25.60 |
| Profit on the visit | $89.93 |
| Monthly share of that visit (÷ 12) | $7.49 |
| Recordkeeping, every month | $8.00 |
| Net monthly profit | −$0.51 (−3.67% margin) |
The ticket says $89.93 and the year says minus six dollars. Nothing about the visit went wrong — the arithmetic simply never had enough units to carry a fixed monthly cost across twelve months of nothing happening.
Holding every other figure above constant and moving only the unit count, the line is crossed at 7 extinguishers:
| Extinguishers | Profit on the visit | Net monthly profit |
|---|---|---|
| 4 | $53.68 | −$3.53 |
| 5 | $71.80 | −$2.02 |
| 6 | $89.93 | −$0.51 |
| 7 | $108.06 | $1.00 |
| 8 | $126.18 | $2.52 |
| 10 | $162.44 | $5.54 |
| 12 | $198.69 | $8.56 |
| 18 | $307.45 | $17.62 |
Every one of those visits looks profitable on the day. Four of them lose money over the year. That is the gap this calculator exists to close — and note how flat the monthly column is: each additional extinguisher is worth only about $1.51 a month, so a small site does not climb out gradually. It needs either more units or a lower fixed cost.
Seven is not your number. It is the break-even for the pricing above. Lower your inspection fee, drive farther, or carry a heavier recordkeeping cost and the line moves up; the point is that the line exists and that it is well above the unit count most operators would think twice about.
A small site punishes a long trip, because the trip is a fixed cost divided by very few billable units. The same 6-extinguisher account, moved from a 24-minute, 9-mile round trip to a 40-minute, 22-mile one:
| Same site, different trip | Profit on the visit | Net monthly profit |
|---|---|---|
| 24 min, 9 miles | $89.93 | −$0.51 |
| 40 min, 22 miles | $72.69 | −$1.94 |
Nothing about the work changed — same units, same fees, same materials. Only the trip did, and it nearly quadrupled the monthly loss. This is the arithmetic behind the old route-operator instinct that a distant small account is worse than no account: it is not superstition, it is a fixed cost with almost nothing to spread across.
Add units. The most direct fix and often the easiest conversation — a building with six serviced extinguishers frequently has more that nobody has put on the schedule. One more unit turns the example positive.
Cut the per-customer recordkeeping share. This is the cost doing the damage, because it is the only one that bills in months a site with an annual cadence never sees. At $3 a month instead of $8, the same 6-unit site clears $4.49 a month at a 32.64% margin — a bigger swing than adding three extinguishers.
Stop making it a special trip. If the site can be serviced on the way to a larger neighbouring account, its drive time and mileage stop being charged against six units alone.
Re-price, but know the leverage is weak. On six units, an extra dollar per unit on the inspection fee moves the monthly figure by only about fifty cents. Re-pricing works on a big site; on a small one the fixed costs are the story.
And if none of those apply, that is a real answer too. A site that cannot clear its own recordkeeping cost is one you are subsidising — worth knowing before renewal, not after.
At typical route pricing — a $9 inspection fee and $2.50 tag fee per unit, one certified visit a year, a 24-minute round trip, and $8 a month in recordkeeping for that customer — break-even lands at 7 extinguishers. A 6-unit site loses about $0.51 a month; a 7-unit site clears about $1.00. The exact number moves with your own fees, drive time, and recordkeeping cost, which is what the calculator is for.
Because NFPA 10 certified maintenance is an annual visit, so that profit is earned once and then spread across twelve months — about $7.49 a month from an $89.93 visit. Recordkeeping for that customer's inspection history bills every month whether you visit or not. At $8 a month, the monthly cost is larger than the monthly share of the visit, and the site is underwater despite a healthy-looking service ticket.
Yes, and faster than most operators expect on a small site, because the drive is a fixed cost spread over very few billable units. Moving the same 6-extinguisher site from a 24-minute, 9-mile round trip to a 40-minute, 22-mile one drops visit profit from $89.93 to $72.69 and takes the monthly figure from −$0.51 to −$1.94. The unit count did not change; only the trip did.
Three levers, in rough order of effect. Add units — a 7th extinguisher turns the example positive on its own. Cut the per-customer recordkeeping share: at $3 a month instead of $8, the same 6-unit site clears $4.49 a month. Or stop making it a special trip, so its drive time is shared with a neighbouring stop rather than charged against six units alone. Raising the inspection fee works too, but on six units each extra dollar per unit moves the monthly figure by only about fifty cents.