Calculate travel time and arrival time for your journey.
What Is a Drive Time Calculator?
A drive time calculator estimates how long a car journey will take by working from the distance you need to cover and the average speed you expect to drive. It’s a quick way to plan a road trip, work out what time you need to leave to arrive by a certain time, or simply get a realistic sense of a long-distance drive before you commit to it.
Unlike a live navigation app, this calculator doesn’t pull real-time traffic or route data. Instead, it gives you a straightforward estimate based on the numbers you provide, which makes it useful for early trip planning, before you’ve settled on an exact route.
How to Calculate Drive Time
Step 1: Enter the total distance of your trip in kilometres.
Step 2: Enter your expected average speed in km/h, based on the type of roads you’ll mostly be driving on.
Step 3: Add any planned stops, such as fuel breaks or meal stops, if you want a more realistic total travel time.
Step 4: The calculator divides distance by speed to give you the driving time, then adds any stops to give you the total trip time.
Drive Time Formula
Driving Time = Distance ÷ Average Speed
Total Trip Time = Driving Time + Total Stop Time
If you also enter a departure time, the calculator adds the total trip time to that starting point to estimate your arrival time.
Worked Example
Say you’re driving from Johannesburg to Durban along the N3, a distance of roughly 570 km. If you maintain an average speed of 110 km/h, including a mix of open highway and slower sections through towns and interchanges, your driving time works out as:
Driving Time = 570 km ÷ 110 km/h = 5.18 hours (approximately 5 hours 11 minutes)
If you plan two 20-minute stops for fuel and a meal along the way, your total trip time becomes:
Total Trip Time = 5 hours 11 minutes + 40 minutes = 5 hours 51 minutes
Leaving Johannesburg at 07:00 would put your estimated arrival in Durban at around 12:51.
Average Driving Speeds in South Africa
Your average speed depends heavily on the type of road you’re travelling on, not just the speed limit. As a general guide:
- Open highway or national routes (such as the N1, N2, or N3): 100-120 km/h, though traffic volume and roadworks can slow this considerably.
- Secondary roads and provincial routes: 80-100 km/h.
- Town and city driving: 30-50 km/h, factoring in traffic lights, congestion, and lower speed limits.
A long-distance trip typically involves a mix of all three, which is why using a single blended average, rather than the maximum speed limit, gives a far more realistic estimate.
Factors That Affect Your Actual Drive Time
A calculated estimate is a useful starting point, but several real-world factors can extend your actual travel time on South African roads:
- Peak-hour congestion around major cities like Johannesburg, Cape Town, and Durban, particularly on routes like the N1 through Gauteng.
- Toll plazas on routes such as the N1, N3, and N4, where queues can add unplanned delays.
- Roadworks, weather conditions, and long-haul freight traffic on major national routes.
- Load shedding affecting traffic light operation in some areas, which can slow intersections considerably during outages.
Building a buffer of 10 to 15 percent into your estimated drive time is a reasonable way to account for these variables on longer trips.
Planning Rest Stops on Longer Trips
Fatigue is a significant factor in road safety, and the Automobile Association of South Africa recommends taking a break of at least 15 minutes every two hours on long drives. For a trip like Johannesburg to Cape Town, which covers close to 1,400 km, this typically means budgeting for at least three to four proper rest stops in addition to fuel breaks, rather than trying to drive the full distance in one continuous stretch.
If you’d also like to estimate what the trip will cost in fuel, use our Fuel Cost Calculator alongside this tool to budget for the full journey.