The true cost of a support call

Ask a contact centre what a call costs and you'll usually get one of two answers: a suspiciously round number nobody can source, or a shrug. Yet cost per contact is the single input that every support business case — deflection, self-service, chatbots, knowledge bases — is built on. Get it wrong and everything downstream is wrong with it.

Here is what the verifiable evidence says, and how to build a per-call figure your finance team will accept.

What the benchmarks actually say

The most useful independent figure comes from ContactBabel's survey of 207 US contact centre operations: the average cost of an inbound call is $7.20 — 47% more than an email and 23% more than a web chat (ContactBabel, 2026). The UK equivalent, from around 200 UK operations, puts an inbound call at £5.58 — 57% more than email and 83% more than a web chat (ContactBabel, 2024).

Gartner's 2019 poll of service and support leaders found live channels averaging $8.01 per contact, against roughly $0.10 per contact for self-service (Gartner, 2019). That figure is pre-AI-era and averages all live channels rather than phone alone — but the shape of it is the point. A live contact costs dollars; a self-service contact costs cents. An eighty-to-one gap survives a lot of quibbling about methodology.

So a defensible starting band for a phone contact is roughly $7–8 in the US, or around £5.60 in the UK. Your own number may sit well above or below it — which is why benchmarks should anchor your estimate, not replace it.

Why your real number is probably higher

Most in-house cost-per-call figures are built from agent wages divided by calls handled. That systematically understates the truth, for two reasons.

Wages are not what an employee costs. US Bureau of Labor Statistics data on employer costs shows benefits adding about 30% on top of wages — a multiplier of roughly 1.43× on wages for private industry (BLS ECEC, 2026). And that multiplier is a floor: it excludes recruiting, training, equipment, software licences and office overhead. If your model prices agent time at raw salary, it is quietly optimistic before you've entered a single assumption.

Hours worked are not hours paid. Annual leave, sickness and holidays mean the divisor for productive time is smaller than the payroll figure suggests. OECD data puts average annual hours actually worked at about 1,800 in the US and 1,533 in the UK (OECD, 2025) — well short of the 2,087 gross paid hours in the US federal pay divisor (OPM). Divide loaded cost by paid hours instead of worked hours and you understate the cost of every minute an agent spends on a call.

Handle time completes the picture. The industry-wide average handle time runs at about 6 minutes 3 seconds (Call Centre Helper, 2026), with telecoms nearer nine minutes and retail around five and a half — so two contact centres with identical hourly costs can have very different per-call costs purely on call complexity.

As an illustrative example: an agent on £28,000 becomes roughly £39,200 fully loaded at the 1.4× floor. Spread over about 1,533 worked hours, that is around £25.60 per hour. At six minutes of handle time plus wrap-up and shrinkage, you are in the £4–6 per call range before management overhead and telephony — which is exactly where the ContactBabel UK benchmark lands. When your bottom-up number and an independent benchmark agree, you have a figure a CFO will accept.

The deflection teaser

Once you trust your cost per call, the economics of deflection become simple: every contact resolved in self-service swaps a cost measured in pounds for one measured in pence. That is why deflection business cases look so attractive — and why they are so often oversold.

The evidence urges restraint on the assumption that matters most: the deflection rate. Fully 81% of customers attempt self-service before contacting a live representative (HBR, 2017) — but attempting is not succeeding. Gartner's 2023 consumer survey found only 14% of issues are fully resolved in self-service, and only 36% even of issues customers call "very simple" (Gartner, 2024). The demand for self-service is enormous; realised resolution is modest. A business case built on a 50% deflection assumption with no supporting evidence is a business case built on hope.

The honest structure is a range: a conservative case anchored near the customer-reported reality, an optimistic case that assumes your implementation genuinely beats the average, and a clear statement of which one you'd bet on. The gap between $8.01 and $0.10 is so wide that deflection cases usually clear the bar even on conservative assumptions — which is precisely why you can afford to model them honestly.

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If you want to put your own numbers through this logic, the support call reduction calculator builds the fully-loaded cost per call from your inputs and projects conservative, moderate and optimistic scenarios with every assumption on an audit trail; the call deflection calculator does the same for self-service economics. Your first calculator is free, with unlimited re-runs.