Mileage cost is the round-trip miles times your cost per mile (the editable IRS standard rate, or gas price ÷ MPG). Drive-time labor is the drive minutes — derived from distance and average speed, or typed in — times your combined crew hourly rate. The two sum to a base fee, which is floored to your job minimum, then multiplied by the after-hours premium.

round_trip_miles = round_trip ? one_way × 2 : one_way
mileage_cost     = round_trip_miles × rate        (IRS)
                 = round_trip_miles × gas / mpg    (gas)
drive_minutes    = (one_way / speed) × 60 × (rt ? 2 : 1)   (derive)
                 = one_way_minutes × (rt ? 2 : 1)          (manual)
drive_labor      = (drive_minutes / 60) × crew_rate
base_fee         = mileage_cost + drive_labor
floored_fee      = max(base_fee, job_minimum)
final_fee        = floored_fee × after_hours_multiplier
recommended      = round to nearest $5
band             = ±20% of the unrounded final fee, each to nearest $5

Worked example: 14 mi one-way, round trip (28 mi), IRS $0.70/mi, crew $25/hr, 22.5 min one-way (45 min round trip), $75 floor, weekend ×1.5 → mileage $19.60 + labor $18.75 = $38.35 base, floored to $75, ×1.5 = $112.50 → recommended $115 (range $90–$135).

After-hours multipliers (none 1.0 / evening 1.25 / weekend 1.5 / holiday 2.0) are round, defensible midpoints of cited trade ranges — edit them to your shop. Distance is whatever you enter; this tool does not look up routes or maps, which keeps it private and instant.

Trip Charge & Service Call Fee Calculator

Sources