Route from Cardiff to Portsmouth

The distance between Cardiff and Portsmouth is 149 miles. Travel time is 2 hours and 39 minutes.

From: Cardiff, County: Cardiff, Wales
To: Portsmouth, County: Hampshire, England
149 mi , 2 h 39 min
Tolls: 0£ Stations
Fuel consumption:
Fuel cost:
Passengers:



Route from Cardiff to Portsmouth on map



Driving directions from Cardiff to Portsmouth

149 mi 2 h 39 min
1.
Head southwest on Kingsway (A4161)
436 ft
2.
Make a U-turn onto Duke Street (A4161)
311 ft
3.
Continue slightly left onto Kingsway (A4161)
394 ft
4.
Make a slight right onto Kingsway
405 ft
5.
Continue slightly right onto Greyfriars Road
847 ft
6.
Turn left onto Park Place
282 ft
7.
Turn right onto Stuttgarter Strasse (A4161)
641 ft
8.
Continue onto Dumfries Place (A4161)
740 ft
9.
Continue onto Newport Road (A4161)
1.8 mi
10.
Enter the roundabout and take the 2nd exit onto Newport Road (A4161)
83 ft
11.
Exit the roundabout onto Newport Road (A4161)
732 ft
12.
Make a slight left
0.3 mi
13.
Go straight onto Southern Way (A4232)
0.3 mi
14.
Enter Llanedeyrn Interchange and take the 3rd exit towards A48: Newport
714 ft
15.
Exit the roundabout towards A48: Newport
5 mi
16.
Keep left onto A48(M)
0.4 mi
17.
Merge right onto M4
13.4 mi
18.
Keep right onto M4
63 mi
19.
Take the ramp on the left towards A338
0.4 mi
20.
Enter Wickham Interchange and take the 1st exit onto A338
98 ft
21.
Exit the roundabout onto A338
0.5 mi
22.
Turn right onto Baydon Road (B4000)
2.2 mi
23.
Continue onto Newbury Road (B4000)
1171 ft
24.
Continue onto Ermin Street (B4000)
3.9 mi
25.
Enter Bath Road Junction and take the 2nd exit onto Bath Road (A4)
129 ft
26.
Exit the roundabout onto Bath Road (A4)
0.3 mi
27.
Enter Bath Road Junction and take the 1st exit
13 ft
28.
Exit the roundabout
0.3 mi
29.
Merge right onto Newbury Bypass (A34)
25.7 mi
30.
Enter Winnall Interchange and take the 3rd exit onto M3
1107 ft
31.
Exit the roundabout onto M3
7.9 mi
32.
Keep right onto M3
1.1 mi
33.
Keep right onto M3
1.1 mi
34.
Merge right onto M27
17 mi
35.
Take exit 12 on the left towards M275: Portsmouth (West)
1012 ft
36.
Merge left onto M275
1.8 mi
37.
Take exit 2 on the left towards Cruise and Cross Channel Ferries
0.3 mi
38.
Enter Rudmore Roundabout and take the 1st exit onto Twyford Avenue (A3)
31 ft
39.
Exit the roundabout onto Twyford Avenue (A3)
0.4 mi
40.
Turn left onto Wilson Road
876 ft
41.
Turn left onto Gruneisen Road
62 ft
42.
You have arrived at your destination, on the left
0 ft


How much does it cost to drive from Cardiff to Portsmouth with petrol?

Let's delve into the expenses of a road trip from Cardiff to Portsmouth. The journey using petrol will set you back 25.9 pounds. Now, let's walk through how we arrived at this figure.

Firstly, we consider the price of petrol, which is 143 pence per liter. Next, we take into account the car's fuel consumption rate, which stands at 37.5 miles per gallon.

Now, suppose you're carpooling. If there are two passengers sharing the ride, each person will contribute 12.95 pounds (£25.9 divided by 2). With three passengers, the cost per person drops to around 8.63 pounds (£25.9 divided by 3). And if there are four passengers onboard, each person chips in 6.48 pounds (£25.9 divided by 4).

Let's delve deeper into the calculations. To determine how much fuel is needed for the trip, we rely on the distance and the car's fuel efficiency. The distance between Cardiff and Portsmouth is approximately 149.26 miles. So, to cover this distance, the car will require roughly 18.1 liters of petrol. We obtained this value by dividing the distance by the car's fuel consumption rate of 37.5 miles per gallon and then converting it to liters.

Once we have the amount of fuel needed, we calculate the total cost. Multiplying the fuel quantity (18.1 liters) by the price per liter (143 pence) yields 25.9 pounds. Therefore, the fuel cost for the journey from Cardiff to Portsmouth is 25.9 pounds.
 

Diesel cost from Cardiff to Portsmouth.

The trip with diesel fuel costs 16.3 £ (151p/lt, 62.7 mpg).
For 2 passengers: 8.15 £ (16.3/2) /p.
For 3 passengers: 5.43 £ (16.3/3) /p.
For 4 passengers: 4.08 £ (16.3/4) /p.

Diesel fuel and gasoline (petrol) fuel have differences:

  1. Compression Ignition vs. Spark Ignition: Diesel engines operate on compression ignition, where the fuel-air mixture ignites spontaneously due to high pressure and temperature, while petrol engines rely on spark ignition from spark plugs. This fundamental difference in combustion processes leads to different engine designs and performance characteristics.

  2. Fuel Efficiency: Diesel engines tend to be more fuel-efficient than petrol engines, primarily due to their higher compression ratios and thermal efficiency. Diesel engines can extract more energy from each unit of fuel compared to petrol engines, resulting in better fuel economy and lower fuel consumption.

Alternative routes from Cardiff to Portsmouth

Meanwhile, the least speedy route from Cardiff to Portsmouth covers 170.98 miles and necessitates 3 hours and 30 minutes for completion.

Which is the cheapest route from Cardiff to Portsmouth by car?

The cheapest route from Cardiff to Portsmouth is the first suggested route (149mi, 2h 39min) and costs 25.9 £ (petrol fuel cost, 143p/lt, 37.5mpg).

The most expensive route from Cardiff to Portsmouth is the second suggested route (171mi, 3h 30min) and costs 29.6 £.

For greater safety, the driver should choose the route that passes through the highway (median barrier) and not through smaller roads (curves in the road, bad road conditions, no median barrier).

How to get from Cardiff to Portsmouth?

There are two suggested routes. The fastest route is 149mi (distance from Cardiff to Portsmouth) and its duration is 2h 39min. The slowest route is 171mi, and its duration is 3h 30min.

RouteCalculator provides you with the information to prepare your trip from Cardiff to Portsmouth by car or motorbike. It offers you alternative road routes that you can follow to go from Cardiff to Portsmouth. It provides driving directions from Cardiff to Portsmouth, i.e. where to turn and when, distance of the Cardiff - Portsmouth route, travel time, display of the route on the map, fuel cost (petrol, diesel) and toll (if exist) cost.

In case you share the journey (carpooling) from Cardiff to Portsmouth with other people or friends, RouteCalculator provides the cost of the journey and the amount that each passenger will have to pay.

Where is Cardiff located?

Cardiff is located in Cardiff county and in Wales. It is situated at an altitude of 12 meters above sea level. Cardiff has coordinates 51.4815810o,-3.1790900o. RouteCalculator provides a map of Cardiff from which you can plan your trips to other UK cities.

What is the location of Portsmouth?

Portsmouth is located in Hampshire county and in England. It is situated at an altitude of 4 meters above sea level. Portsmouth has coordinates 50.8197675o,-1.0879769o. RouteCalculator provides a map of Portsmouth from which you can plan your trips to other UK cities.