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Traffic Intensity Calculator

Work out traffic intensity instantly with clear inputs, formula shown and shareable results.

About Traffic Intensity Calculator

Traffic intensity in erlangs is total occupancy time divided by the observation period, so 500 calls of 210 seconds in an hour is 29.2 erlangs — meaning on average 29 circuits are busy. It is a dimensionless measure of demand and is the input to every Erlang formula. CCS, still used in North America, is simply erlangs multiplied by 36.

Formula

Traffic intensity

erlangs = calls x average duration / period in seconds; CCS = erlangs x 36

Worked example

With the default values below, Traffic Intensity Calculator returns Traffic intensity of 29.167. Change any input above and every figure here is recalculated in your browser.

Inputs used

Calls or sessions in the periodminimum 0.01
500
Average durationminimum 0.01 s
210 s
Measurement periodminimum 0.1 min
60 min

Results

Traffic intensity
29.167 erlangs
Traffic in CCS
1,050.00 CCS
Call attempt rate
0.1389 calls/s
Absolute minimum channels
30

Step by step

  1. 1Values used
  2. 2Traffic intensity
  3. 3Traffic intensity= 29.167 erlangs
  4. 4Traffic in CCS= 1,050.00 CCS
  5. 5Call attempt rate= 0.1389 calls/s
  6. 6Absolute minimum channels= 30

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why is the minimum channel count not enough?

It is the average occupancy. Arrivals fluctuate, so serving 29.2 erlangs with 30 channels would block a large share of calls; Erlang B typically calls for around 40.

Should traffic be measured in the busy hour?

Yes. Capacity is sized for the busiest hour of a typical day, not the daily average, which is usually a fraction of it.

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