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Calcimator

Network Latency Calculator

Calculate round-trip time from hops, distance, processing delays, and queuing. Includes VoIP quality assessment and TCP throughput estimate.

Inputs

km
ms
ms
bytes
Mbps

Results

One-Way Latency

6.05 ms

Round-Trip Time (RTT)

12.1 ms

Propagation Delay2.49 ms
Total Processing Delay1 ms
Total Queuing Delay2.5 ms
Total Transmission Delay0.06 ms
Estimated Jitter0.5 ms
TCP Throughput (0.1% loss)30.5 Mbps
VoIP Quality (0-2)2
How to Use This Calculator
  1. Enter Total Distance, Number of Hops, and Processing Delay per Hop.
  2. Set Queuing Delay per Hop, Packet Size, and Link Speed.
  3. Review One-Way Latency (ms) and Round-Trip Time (RTT) (ms).
  4. Use Propagation Delay (ms) and Total Processing Delay (ms) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Number of Hops

Number of HopsOne-Way LatencyRound-Trip Time (RTT)
5.96.69 ms13.38 ms
1815.31 ms30.61 ms
3325.99 ms51.97 ms
4534.53 ms69.06 ms

What each input means

Total Distance
Total physical distance of the network path in kilometers
Number of Hops
Number of routers/switches in the path
Processing Delay per Hop
Router/switch processing time per hop (0.1-0.5 ms typical)
Queuing Delay per Hop
Average queuing delay at each hop (depends on congestion level)
Packet Size
Packet size in bytes (1500 = standard Ethernet MTU)
Link Speed
Bottleneck link speed in Mbps

How this is calculated

Formula

Latency = Propagation + Processing + Queuing + Transmission

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total Distance = 500, Number of Hops = 5, Processing Delay per Hop = 0.2, Queuing Delay per Hop = 0.5 = 6 input(s) provided
  2. Calculate One-Way Latency
    One-Way Latency
    6.05 = 6.05
  3. Calculate Round-Trip Time
    Round-Trip Time
    12.1 = 12.1
  4. Calculate Propagation Delay
    Propagation Delay
    2.49 = 2.49
  5. Calculate Total Processing Delay
    Total Processing Delay
    1 = 1

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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