Calculator Inputs
Use the fields below to estimate call demand, workload hours, and staffing pressure.
Plotly Graph
The chart shows forecast call distribution and staffing demand by hour.
Example Data Table
This sample shows how weekly call volume, workload hours, and agents can look in practice.
| Day | Calls | Workload Hours | Agents Needed |
|---|---|---|---|
| Mon | 210 | 6.8 | 14 |
| Tue | 225 | 7.1 | 15 |
| Wed | 240 | 7.4 | 16 |
| Thu | 235 | 7.2 | 15 |
| Fri | 260 | 7.9 | 17 |
| Sat | 150 | 5.1 | 10 |
| Sun | 120 | 4 | 8 |
Formula Used
1. Total CallsTotal Calls = Inbound Calls + Outbound Calls
2. Calls Per DayCalls Per Day = Total Calls / Days In Period
3. Average Handle TimeAHT = Talk Time + Hold Time + Wrap Time
4. Daily Workload HoursDaily Workload Hours = (Calls Per Day × AHT in seconds) / 3600
5. Net Paid Hours Per AgentNet Paid Hours = Agent Paid Hours × (1 − Shrinkage %)
6. Productive Hours Per AgentProductive Hours = Net Paid Hours × Occupancy %
7. Base Agents NeededBase Agents = Daily Workload Hours / Productive Hours Per Agent
8. Peak Hour CallsPeak Hour Calls = Calls Per Hour × Peak Factor
9. Peak Agents NeededPeak Agents = Peak Hour Workload Hours / ((1 − Shrinkage %) × Occupancy %)
10. Recommended AgentsRecommended Agents = Ceiling(Max(Service Adjusted Agents, Peak Agents))
This is a practical planning model. It is not a full Erlang C queueing calculation.
How to Use This Calculator
- Enter the number of inbound and outbound calls for your chosen period.
- Add the number of operating days and open work hours per day.
- Fill in average talk, hold, and wrap times in seconds.
- Enter your target occupancy, shrinkage, and service level target.
- Use a peak factor above 1 to reflect busier hours.
- Enter paid agent hours per day to reflect schedule length.
- Press the calculate button to display results above the form.
- Review the summary table, graph, and projections before scheduling staff.
Frequently Asked Questions
1. What does this call volume calculator measure?
It estimates total calls, workload hours, average handle time, peak demand, and recommended staffing. It helps teams plan daily coverage more confidently.
2. Why include outbound calls?
Outbound activity still consumes agent capacity. Including both inbound and outbound calls gives a better blended view of actual daily workload.
3. What is average handle time?
Average handle time combines talk time, hold time, and after-call wrap work. It shows how long one call occupies an agent.
4. What does shrinkage mean here?
Shrinkage represents paid time unavailable for live handling, such as meetings, breaks, coaching, training, and other non-phone activities.
5. What is target occupancy?
Occupancy is the share of available agent time spent handling calls. Lower targets create more breathing room. Higher targets increase efficiency but raise pressure.
6. What does peak factor change?
Peak factor scales average hourly demand to reflect busier periods. A value above 1 raises the estimated peak-hour call load and staffing requirement.
7. Is this the same as Erlang C?
No. This tool gives a strong planning estimate using workload and capacity logic. Erlang C is more detailed for queueing and delay analysis.
8. When should I use this calculator?
Use it during staffing reviews, shift design, budget planning, growth forecasting, and workload checks for support desks, call centers, and sales teams.