Mapping apps are optimistic about Thailand. They assume you hold the speed limit, that nothing is stopped in the left lane, and that you do not need to get off a motorbike every ninety minutes because your hands have gone numb. The result is a journey time that is routinely a third short.
This calculator applies realistic average speeds by road type and vehicle, then adds the stops you will actually take. It is a planning estimate, not a promise — but it is a far better basis for deciding whether to leave at six in the morning.
How long will it really take?
Where the numbers come from
These are working averages for a whole journey — including the towns you slow for, the fuel stop, the wrong turning and the ten minutes behind a loaded pickup on a hill. They are deliberately not top speeds, and they are not speed limits, which are a separate matter covered on their own page.
| Road | Car | Scooter | Larger motorbike |
|---|---|---|---|
| Motorway / expressway | 90 km/h | not permitted on most | 85 km/h |
| Main divided highway | 75 km/h | 55 km/h | 75 km/h |
| Rural two-lane | 60 km/h | 50 km/h | 60 km/h |
| Mountain road | 40 km/h | 35 km/h | 45 km/h |
| City streets | 25 km/h | 28 km/h | 28 km/h |
A scooter is slower than a car on open roads and faster than one in a city, which is the whole argument between them in a single table. See scooter or car if you have not chosen yet.
Motorbikes are barred from many Thai expressways and motorways. Before you plan a leg on one, check the expressway network guide — the alternative parallel highway is usually only a little slower.
The stops are not optional
The calculator adds a break for every two hours of driving, and more on a motorbike. That is not padding. Riding in this climate is physically demanding in a way that catches out people used to riding in temperate countries: you dehydrate without noticing, and concentration goes before you feel tired. See fatigue on long drives and dehydration on a bike.
If the estimate pushes you past sunset, change the plan. Leave earlier, break the journey, or accept arriving the next morning. Night driving on an unfamiliar Thai road is the single largest avoidable risk a visitor takes — see driving at night.
What the estimate cannot know
- Whether the road is dug up. Thai roadworks appear and vanish with little warning — see roadworks.
- Whether it is a public holiday. On Songkran and New Year the main routes out of Bangkok can double.
- Whether your route includes a ferry. Add the crossing plus the wait — see car ferries.
- Flooding. In the wet season a coastal or low-lying road can close outright — see the rainy season.
Why is this so much slower than Google Maps?
Mapping apps estimate driving time at close to the legal maximum with light traffic, and they exclude your stops. Over a 400km day the difference is commonly two hours or more.
How far is a comfortable day's drive in Thailand?
In a car, 400–500km on good highways is manageable but tiring. On a scooter, 250km is a long day and 150km is a pleasant one. On mountain roads, halve those figures.
Should I drive Bangkok to Chiang Mai in one go?
It is around 700km and it is a great deal more pleasant broken into two days. See Bangkok to Chiang Mai.
Does the calculator account for tolls?
Toll booths are included in the motorway average. Electronic lanes are quicker — see Easy Pass and M-Flow.