Drive Time Calculator
Calculate driving time from distance and speed, including rest breaks.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Estimate drive time from distance and average speed. Breaks are added only when driving continues after the selected interval. The arrival clock assumes a 09:00 departure, wraps at midnight, and does not show the arrival date. Traffic and route conditions are not modeled. Fuel cost is an illustration using 30 US mpg and US$3.50 per US gallon.
Worked example
calculated with the default values below
Trip distance 300 mi · Average speed 55 mph · Break every 2 h · Break length 20 min · Toll stops 0 · Minutes per toll stop 2 min Driving time 5.45 h · Number of breaks 2 · Total break time 0.67 h · Total journey time 6.12 h · Arrival time (24-hour clock; depart 09:00) 15:07 · Illustrative fuel cost (30 US mpg, $3.50/US gal) 35 $
General background references
Disclaimer
These calculators give general estimates. Sizing, pricing, availability and standards vary by brand, retailer and country, so treat the output as a starting point and confirm it against the seller's or authority's own figures.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
T = d ÷ v + (max(0, ⌊d ÷ (v × b)⌋) × L + n × s) ÷ 60
- d
- Trip distance (mi)
- v
- Average speed (mph)
- b
- Break interval (h)
- L
- Break length (min)
- n
- Toll stops
- s
- Minutes per toll stop
- T
- Estimated duration (h)
Breaks = max(0, ceil(driving time ÷ interval) − 1); a break is counted only when driving continues after that interval. Arrival clock assumes 09:00, wraps at midnight and does not show a date. Fuel cost assumes 30 US mpg and $3.50 per US gallon.
Frequently asked questions
How is the arrival clock displayed?
The estimate adds distance ÷ average speed, the modeled breaks, and toll-stop minutes to a fixed 09:00 departure. Arrival is wrapped to a 24-hour clock and shown as HH:MM. Fuel cost is a separate illustration using 30 mpg and US$3.50 per gallon; traffic and route conditions are not modeled.