Level of Service (LOS) Calculator
Determine roadway Level of Service grade (A through F) from traffic volume, lane count, free-flow speed, and vehicle mix using HCM methodology.
Inputs
veh/hr
mph
Results
LOS Grade
A
DescriptionFree flow, minimal delay
Adjusted Flow Rate543 pc/hr/ln
Density9.1 pc/mi/ln
V/C Ratio0.23
Average Speed60 mph
Total Capacity4,800 veh/hr
How to Use This Calculator
- Enter Traffic Volume, Number of Lanes, and Free-Flow Speed.
- Set Peak Hour Factor, Heavy Vehicle %, and Terrain.
- Adjust Level, Rolling as needed.
- Review the LOS Grade result.
- Use Description and Adjusted Flow Rate (pc/hr/ln) to inform your decision.
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