Random Drug & Alcohol Pool Calculator
Enter your CDL driver pool size and get the FMCSA-required random drug and alcohol test counts for the year, distributed across quarters.
Average number of CDL driver positions subject to FMCSA testing during the year.
Both rates are 50% drugs / 10% alcohol for 2026.
Annual minimums for 3 drivers
Per 49 CFR §382.305 at 50% drugs / 10% alcohol.
Random drug tests
2
50% of pool, rounded up
Random alcohol tests
1
10% of pool, rounded up
Distributed across quarters
| Quarter | Drug tests | Alcohol tests |
|---|---|---|
| Q1 | 1 | 1 |
| Q2 | 1 | 0 |
| Q3 | 0 | 0 |
| Q4 | 0 | 0 |
| Total | 2 | 1 |
Tests must be unannounced and reasonably spread throughout the year — not bunched into one quarter. Your C/TPA selects names from the pool randomly; you administer the tests within the timeframe they specify.
How the math works
The FMCSA sets minimum annual random testing rates under 49 CFR §382.305. For 2026, the rates for property- and passenger-carrying motor carriers are:
- Random drug testing: 50% of the average number of driver positions per year
- Random alcohol testing: 10% of the average number of driver positions per year
The pool size is the average number of CDL driver positions subject to FMCSA testing during the year — not just the count on any one day. Tests must be unannounced and reasonably spread throughout the year, which is why we show a per-quarter breakdown.
A driver can be selected more than once in a year. The minimums are calculated against the pool, not the individual.
What counts toward the random pool
Drivers who operate a commercial motor vehicle requiring a CDL — which generally means a vehicle with a GVWR of 26,001 lbs or more, a vehicle designed to transport 16 or more passengers, or a vehicle transporting placardable hazardous materials. Drivers who do not require a CDL are not subject to Part 382 testing.
What the calculator doesn't cover
This is the random testing minimum only. Pre-employment, post-accident, reasonable suspicion, return-to-duty, and follow-up tests are separate categories with their own triggers under §382. A complete drug & alcohol program includes all of them, plus a written policy, supervisor training, and Clearinghouse queries.
This tool is general guidance, not legal advice. The CFR is the authoritative source. Roadworthy HQ tracks your random pool compliance automatically — you can try it free for 14 days.