Oil leak cost calculator
Drops-per-minute or flow-rate leak converted to annualized cost — oil, environmental disposal and cleanup labor — at your lubricant price.
How this calculator works
The leak rate is first converted to gallons per day:
- gal/hr × 24
- L/hr × 24 × 0.264172
- L/day × 0.264172
- drops/min × 1,440 ÷ 15,840, using 15,840 drops per gallon, so 1 drop/min ≈ 0.09 gal/day (about 33 gal/yr)
A continuous leak is assumed to run 24 hours a day, 365 days a year. Annual cost = gallons per year × (oil cost per gallon + disposal cost per gallon) + cleanup labor rate × hours per week × 52. The Day and Month columns are the annual figures divided by 365 and by 12. In single event mode the entry is a one-off loss in gallons, costed for oil and disposal with no labor.
Inputs explained
- Leak rate: gal/hr, gal/day (default), drops/min, L/hr, L/day or a single event in gallons. Defaults to 1.
- Oil cost per gallon: defaults to $15.00.
- Labor cost to clean up ($/hr) and hours spent on cleanup per week: both default to 0.
- Environmental / disposal cost per gallon: defaults to 0.
Worked example
A 1 gal/day leak of $15/gal oil, with $2/gal disposal and 1 hour a week of cleanup at $40/hr.
| Item | Day | Month | Year |
|---|---|---|---|
| Oil | $15 | $456 | $5,475 |
| Disposal | $2 | $61 | $730 |
| Labor | $6 | $173 | $2,080 |
| Total | $23 | $690 | $8,285 |
Calculator output: Total annual cost $8,285 · “Oil lost: 365 gal/yr (1.00 gal/day)”. With the rate set to 10 drops/min at $15/gal and no other costs, the output is $4,977 a year, “Oil lost: 332 gal/yr (0.91 gal/day)”.
Reading the result & common mistakes
- Reading it: the total is the yearly cost of letting the leak run. Compare it with the cost of the repair (a seal, a fitting, a few labour hours) to rank which leaks to fix first.
- Counting drops: drop size depends on the oil and the leak path, so 15,840 drops per gallon is an estimate. For a better rate, catch the leak in a measuring cup for a timed period and enter it in L/hr or gal/hr.
- Intermittent leaks: rates per hour or per minute are run 24 hours a day, 365 days a year. If the leak only runs while the machine runs, enter the amount lost over a day in gal/day or L/day instead.
- Leaving costs at zero: cleanup labour and disposal default to 0. Add absorbents, contaminated-waste disposal and the time spent on cleanup, or the true cost is understated.
- Top-up oil price: use the price you actually pay per gallon, including freight.
Next step: find why the leak started with the Root Cause Analysis pathway.
Frequently asked questions
How do I convert drops per minute to gallons per day?
This calculator uses 15,840 drops per gallon, so gallons per day = drops per minute × 1,440 ÷ 15,840. One drop per minute is about 0.09 gal/day (33 gal/yr), and 10 drops per minute is 0.91 gal/day (332 gal/yr). Drop size varies with the oil and the leak path, so treat this as an estimate.
What does an industrial oil leak cost per year?
It's the oil plus disposal for every gallon lost, plus cleanup labor. At $15/gal, a 1 gal/day leak costs $5,475 a year in oil alone. Adding $2/gal disposal and one hour a week of cleanup at $40/hr brings it to $8,285.
Does the calculator assume the leak runs all the time?
Yes. Continuous leak rates are annualized at 24 hours a day, 365 days a year. For a one-off spill, choose single event (gal), which costs the oil and disposal only.