You can use these calculators to calculate call minutes, blocking, traffic and number of lines, how many lines for a trunk group, area codes, and more..

Call Minutes Calculator
The Call Minutes Calculator uses the number of minutes of traffic a trunk group is offered in one day to work out the number of required lines.

Call center calculator
Our Call Centre Calculator, which can be used to estimate how many call centre agents you require for each hour of an eight hour day, and how many trunks you need.

Engset Applet
Just like the Erlang calculator it calculates the relation between blocking, traffic and number of lines. Any two of those determine the value of the third.

Engset Calculator
The Engset Calculator can be used to work out how many lines you need for a trunk group if you know the Busy Hour Traffic which the trunk group is offered. It should be used instead of the Erlang B Calculator when the number of traffic sources is finite (less than ten times the number of lines).

Erlang B Calculator
The Erlang B Calculator can be used to work out how many lines you need for a trunk group if you know the Busy Hour Traffic which the trunk group is offered.

Erlang C Calculator
The Erlang C Calculator can be used to estimate how many agents are required in a call centre, if the quantity and length of incoming calls are known.

Erlang Calculator (new version with portrait)
In any system where a large population makes use of a finite number of resources, the blocking probability is given by the Erlang-B formula.

Erlangs to VoIP Bandwidth Calculator
The Erlangs and Bandwidth Calculator can be used to estimate the bandwidth which must be provided through an IP based to satisfactorily transport a given busy hour traffic level.

Extended Erlang B Calculator
The Extended Erlang B Calculator is similar to the Erlang B Calculator but takes retries into account. It can be applied to trunk groups from which no overflow facilities exist.

International Dialing/Area codes calculator
If you need to make a phone call to someone in another country and you are not quite sure how to dial the number, then this service should hopefully help you.

Lines to VoIP Bandwidth Calculator
This calculator can be used to estimate the bandwidth required to transport a given number of voice paths through an IP based network. Reverse calculations are also possible. These estimate the number of voice paths that can be transmitted though an IP network if the available bandwidth is known.