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Calcimator

QoS Bandwidth Reservation Calculator

Allocate bandwidth across QoS traffic classes for VoIP, video, data, and best effort. Includes VoIP call and video stream capacity.

Inputs

Mbps
%
%
%
%
%

Results

VoIP Bandwidth

150 Mbps

Total Allocated

100 %

G.711 VoIP Calls

1,720

Video Bandwidth250 Mbps
Critical Data Bandwidth250 Mbps
Best Effort Bandwidth300 Mbps
Scavenger Bandwidth50 Mbps
G.729 VoIP Calls4,807
HD Video Streams62
Over-Allocated (1=Yes)0
Unallocated Percent0%
Sd Video Streams166
How to Use This Calculator
  1. Enter Total Link Bandwidth, VoIP (EF) Reservation, and Video (AF4) Reservation.
  2. Set Critical Data (AF3) Reservation, Best Effort Reservation, and Scavenger (CS1) Reservation.
  3. Review VoIP Bandwidth (Mbps), Total Allocated (%), and G.711 VoIP Calls.
  4. Use Video Bandwidth (Mbps) and Critical Data Bandwidth (Mbps) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Total Link Bandwidth

Total Link BandwidthVoIP BandwidthTotal AllocatedG.711 VoIP Calls
10,0091,501.4 Mbps100 %17,217
35,0075,251.1 Mbps100 %60,218
65,0049,750.6 Mbps100 %111,818
90,00113,500.2 Mbps100 %154,818

What each input means

Total Link Bandwidth
Total available bandwidth on the link
VoIP (EF) Reservation
Bandwidth reserved for real-time voice (DSCP EF/46, strict priority queue)
Video (AF4) Reservation
Bandwidth for video conferencing and streaming (DSCP AF41/34)
Critical Data (AF3) Reservation
Bandwidth for business-critical apps, ERP, database (DSCP AF31/26)
Best Effort Reservation
Bandwidth for general internet, email, web (DSCP 0)
Scavenger (CS1) Reservation
Lowest priority traffic - recreational, backups (DSCP CS1/8)

How this is calculated

Formula

Class BW = Total BW × Class%; VoIP Calls = VoIP BW / Call BW

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total Link Bandwidth = 1000, VoIP (EF) Reservation = 15, Video (AF4) Reservation = 25, Critical Data (AF3) Reservation = 25 = 6 input(s) provided
  2. Calculate VoIP Bandwidth
    VoIP Bandwidth
    150 = 150
  3. Calculate Total Allocated
    Total Allocated
    100 = 100
  4. Calculate G.711 VoIP Calls
    G.711 VoIP Calls
    1720 = 1720
  5. Calculate Video Bandwidth
    Video Bandwidth
    250 = 250
  6. Calculate Critical Data Bandwidth
    Critical Data Bandwidth
    250 = 250

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.

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