VPN Speed Loss Calculator
Calculate the percentage of speed loss when using a VPN.
Calculator Inputs
Results
VPN Speed Loss
15.0%
Quantifying VPN Performance
Using a VPN for privacy and security almost always comes with a performance cost. This calculator helps you measure exactly how much your VPN is slowing down your connection. To use it, run an internet speed test without your VPN, then run another one while connected to your VPN, and enter both results below.
Frequently Asked Questions
Why does a VPN slow down my internet speed?
A VPN adds several steps to your internet connection. Your data has to be encrypted, sent to the VPN server, decrypted, sent to the destination, and then the whole process is reversed for the response. This extra travel time (latency) and the computational work of encryption naturally reduce speed.
What is a typical VPN speed loss?
A good quality VPN might only reduce your speed by 10-20%. However, speed loss can be 50% or more depending on the VPN protocol used, the distance to the VPN server, and the server's current load. Slower original internet speeds often show a smaller percentage loss.