sky broadband speed test is wrong saying I am getting 37.5 but another third party test say only 27?

[JALL]

Broadband has been bad for a while done a third party speed test it came back as 27, sky says from thier test it is 37.5?

Why the difference?

Both test done within seconds of each other.

What one should I trust?

@JALL

[daveNOS · Accepted solution]

@JALL The tests you have done test different speeds.

The Sky test shows what speed your router is connecting to the cabinet/exchange, independent speed tests show your throughput and that will always be slower due to unavoidable overheads(around 8% is lost) but could be significantly more especially if you are using wireless connections.