Articles - Erlang Calculations

Erlang calculations are essential for accurate forecasting and resource planning in contact centres. This collection of expert tutorials, worked examples, and downloadable tools explains how to apply Erlang formulas to calculate staffing needs, service levels, and call wait times. Learn how the Erlang C model works, how to adapt it for different channels, and how small changes in assumptions can affect performance. These resources help managers and planners use data confidently to balance customer experience with operational efficiency.

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How to Calculate Staffing in a Contact Centre
The Shrinkage Formula Article Image
What is Call Centre Shrinkage and How to Calculate It?
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Excel Based Erlang Calculator for Contact Centres – with Maximum Occupancy
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Erlang C Formula – Made Simple With an Easy Worked Example
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How to Calculate Occupancy in the Contact Centre
Average Handling Time (AHT) formula
How to Calculate Average Handling Time (AHT)
24 / 7 concept
What is the Minimum Number of Staff Required for a 24/7 Call Centre?
A calculator, notepad, graph and pens
Erlang Calculation – An Introduction
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Call Centre Erlang Staffing Calculator – v 5.0 – With Abandons and Day Planner
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What is Erlang and the Erlang Calculator?
An arrow moves from left to right, with words for the industry standards such as KPIS, metrics surrounding the arrow
What Are the Industry Standards for Call Centre Metrics?
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Erlang C for Chat?
Multi channel call centre calculator showing email calls and web chat
Multi-Channel Contact Centre Calculator Tool – Phone Email Chat
How is Average Handling Time (AHT) Distributed? It is Not How you Think!
A picture of the Erlang A formula
A Beginner’s Guide to the Erlang A Formula
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What Is Workforce Management (WFM) in BPO?
Top ten questions regarding the free Erlang calculator….
FAQs – Call Forecasting With Spreadsheets
Trade Secrets: How to Get the Best Out of Your WFM Software
How Do I… Manage and Schedule Multi-Skilled Agents?
Video Image: The Erlang C Formula
The Erlang C Formula
Employee icons above person with paperwork and phone
Erlang X – Everything You Ever Wanted to Know
Celebrating 100 Years of the Erlang Formula!
Top Tips for Improving Contact Centre Shrinkage