Free Online Erlang C Calculator
Instantly calculate your call centre staffing needs — no downloads, no spreadsheets, just fast answers. Our free calculator gives you accurate staff requirements in seconds so you can optimise service levels and improve forecasting accuracy.
This is a simplified version of the Staffing Levels Simulator — one of eight professional WFM tools available to ACXPA Members.
, You're Using the Free Erlang Calculator
This is a simplified version of just one of eight professional WFM tools available to ACXPA Individual Members. Use it below to calculate staffing needs — then see what you'd unlock with a full membership.
As a subscriber, you also get discounts on WFM training courses — links below apply them automatically.
, This Is the Free Version — You've Got the Advanced Suite
This calculator is the simplified public version of the Staffing Levels Simulator inside your Members' WFM Hub. Your advanced version does all of this and a lot more — scenario comparisons, multiple SL targets, export, and seven other professional tools alongside it.
Online Erlang C Calculator
Our calculator will instantly show you how many staff you need on the phones — plus headcount after shrinkage. No spreadsheets, no stress.
8 Professional WFM Tools Available to Members
This free calculator is just the tip of the iceberg. ACXPA Individual Members unlock the full suite of professional workforce planning tools.
Advanced Staffing Levels Simulator
The members' version of the calculator above — scenario comparisons, multiple SL targets, and exportable results.
Workload & Capacity Planner
Convert volume and AHT into minimum FTE once you factor in shrinkage, occupancy and concurrency.
Service Level Simulator
Enter your current team size and see the service levels your current staffing can realistically achieve.
Interval Planner
Stress-test your operation by modelling volume, AHT and staffing scenarios across intervals.
Outlier Detection Wizard
Pinpoint top and bottom performers across multiple metrics to focus your coaching effort.
Shrinkage Calculator
Turn leave, meetings and training hours into an accurate shrinkage % for smarter planning.
Employee Replacement Calculator
Quantify the true cost of turnover — from exit interviews through to full productivity.
Employee Turnover Calculator
Measure attrition and retention against real contact centre benchmarks.
Ready for Professional-Grade WFM Tools?
Explore ACXPA memberships for instant access to the full WFM Hub — plus roundtables, benchmarking reports, training discounts, the full resource library and more.
Keep Learning & Exploring
Free resources to help you get more value from the calculator above.
Learn About Erlang
The science behind call centre forecasting, staffing and service levels — explained in plain English.
WFM Training Courses
Upskill in forecasting, scheduling and real-world workforce optimisation — online with expert trainers.
Free Call Centre Hub
Free guides, templates, glossaries and industry data for contact centre professionals — no account required.
What You'd Unlock as an Individual Member
Full access to all eight WFM tools the moment you upgrade — no waiting, no setup.
Advanced Staffing Levels Simulator
The members' version of the calculator above — scenario comparisons, multiple SL targets and export.
Workload & Capacity Planner
Convert volume and AHT into minimum FTE with shrinkage, occupancy and concurrency applied.
Service Level Simulator
See the service levels your current staffing can realistically achieve before you go live.
Interval Planner
Model how changes in volume, AHT or staffing ripple through your operation interval by interval.
Outlier Detection Wizard
Identify top and bottom performers across multiple KPIs so coaching effort lands where it matters most.
Shrinkage Calculator
Build an accurate shrinkage % from leave, meetings, training and daily interruptions.
Employee Replacement Calculator
Quantify the true cost of losing an employee — from exit interviews through to full productivity.
Employee Turnover Calculator
Benchmark your attrition and retention rates against real contact centre data.
Ready to Unlock the Full WFM Hub?
Upgrade to Individual Membership for instant access to all eight tools — plus roundtables, benchmarking reports, training discounts and more.
Available to You Right Now
Resources available to subscribers — WFM training links are personalised to apply your subscriber discount.
Learn About Erlang
The science behind call centre forecasting, staffing and service levels — explained in plain English.
WFM Training Courses
Upskill in forecasting, scheduling and real-world workforce optimisation — with your subscriber discount applied.
Call Centre Hub
Free guides, templates, glossaries and industry data — your subscriber access to the contact centre resource hub.
Go to Your WFM Hub
Access your complete suite of professional WFM tools — staffing simulators, capacity planners, shrinkage, turnover, outlier detection and more. New tools are added regularly.
More Member Resources
Training links are personalised to apply your member discount automatically.
Members' Call Centre Hub
Your exclusive member hub with roundtables, industry data, benchmarking and contact centre resources.
WFM Training Courses
Live and self-paced WFM training — your member discount is applied automatically.
Learn About Erlang
The science behind call centre forecasting, staffing and service levels — in plain English.
