Put your costs into a worksheet
The price you are charged for a call is the number everyone tracks, and it is real, but it is not the whole cost. An agent's time answering, talking, and following up on that call has a cost too, and if you never add it in, two campaigns with the same sticker price can be very different deals.
The price you are billed
On Callmart, pricing is per connected call, in tiers tied to a buffer, a minimum connected-time threshold measured in seconds after your destination number answers. Ringing time is not counted, and a call is billed once after the call ends, if connected time reaches or exceeds the buffer you selected for that campaign. Calls that are not answered, or that end before the buffer, are not billed. That billed price is your starting point, not your ending point.
Add the time cost
An agent's paid time on a call, including the calls that do not cross your buffer and are not billed, still costs you something in staffing. If you pay an agent by the hour and they spend part of that hour on calls that never close, or never even connect, that time is a real cost sitting outside the per-call price.
Fully loaded cost per call = (call spend + agent time cost for the period) / total calls handledAs a hypothetical example: say in a week you spent 500 dollars on calls, and paid an agent 20 dollars an hour for 25 hours handling those calls, which is 500 dollars in labor. Total cost is 1,000 dollars. If the agent handled 100 calls that week, fully loaded cost per call is 1,000 divided by 100, or 10 dollars, even if the billed price per call was lower on its own.
Follow-up time counts too
If your process includes callbacks, data entry, or a quoting step after the live call ends, that time belongs in the same calculation. A call that takes five minutes live and another fifteen minutes of follow-up work costs you the full twenty minutes of staffing time, not just the five.
Compare buffers with the full picture
A longer buffer changes which connected calls meet the billing threshold. Calls that end below it can still reach your agents and consume staff time. Compare the price, billed share and total handling cost for the same group of calls; the buffer is not an upstream traffic filter.
Track it the same way every period
Pick a period, weekly or monthly, and calculate spend, labor cost, and total calls handled the same way each time. A fully loaded cost per call that jumps around because the inputs are measured inconsistently will not tell you anything useful about whether a campaign is getting cheaper or more expensive to run.
| Hypothetical week | Call spend | Labor cost | Calls handled | Fully loaded cost per call |
|---|---|---|---|---|
| Week A | $500 | $500 | 100 | $10.00 |
| Week B | $500 | $300 | 80 | $10.00 |
The example above is a reminder that two weeks can land on the same fully loaded cost per call for different reasons: fewer calls handled with lower labor cost, or more calls handled with higher labor cost. Looking at the fully loaded number alone would treat both weeks as identical, when the underlying story, staffing efficiency in one case, call volume in the other, is worth understanding separately.
If you are deciding between two campaigns with similar billed prices, fully loaded cost per call is often the number that actually separates them, since one campaign might route more time to agents on calls that never cross the buffer, while another delivers fewer, more efficient calls at the same sticker price.
Recalculate after changing a buffer. A different tier can change both the price per billed call and the share of calls billed, while staff still handle short connections. Keep the denominator consistent when comparing periods: cost per delivered call and cost per billed call answer different questions.
Common questions
01Is fully loaded cost per call the same as CPA?
No. Cost per call measures cost against every call handled, whether or not it closed. Cost per acquisition measures spend against customers closed. They answer different questions and both are useful.
02Does the buffer I choose change what I am billed for a call?
Yes. Pricing is per connected call in tiers tied to your buffer. A call is billed once after it ends, if connected time after answer reaches or exceeds your selected buffer. Calls that do not reach the buffer are not billed.
03Should unanswered or unbilled calls count toward staffing cost?
If an agent spent paid time on them, yes. They do not add to your call spend since they are not billed, but they do add to your labor cost, which belongs in a fully loaded number.
04What is the simplest way to start tracking this?
Start with one week. Pull total call spend, total agent hours paid during that week, and total calls handled, then run the calculation once so you have a baseline to compare future weeks against.