Metric guide

Cost per contact

Q: What is the average cost per call in a UK contact centre?

UK contact centre cost per inbound voice call typically ranges from £4–£8 for standard operations. Financial services and regulated environments run higher (£8–£15) due to compliance overhead and longer AHT. Outsourced BPO operations on low-complexity campaigns may achieve £2.50–£4 through wage arbitrage and higher occupancy. Chat contacts typically cost £2–£5 per contact (lower AHT but concurrency means agents handle 2–4 chats simultaneously). Email/ticket contacts cost £2–£4 per contact on a fully-loaded basis. Self-service contacts cost under £0.20 per interaction, making self-service deflection the highest-leverage cost reduction lever.

Q: How do you calculate cost per contact in a contact centre?

The basic formula is: cost per contact = total operational cost ÷ total contacts handled in the period. Total operational cost should include all direct agent costs (salary, NI, pension), management and support overhead (supervisors, WFM, QA, trainers), facilities (office space, equipment), technology (telephony, CRM, WFM platform), and an allocated share of indirect costs. Contacts handled should be the total handled in the same period, not offered contacts, which includes abandoned calls where no agent time was consumed.

Q: What is the best way to reduce cost per contact?

The most effective cost per contact reduction levers, in order of impact: (1) Self-service deflection, which moves contacts to IVR or chatbot and eliminates agent cost entirely for those contacts. (2) FCR improvement, where each 1% FCR improvement removes 1–1.5% of repeat contacts, reducing total volume handled by agents. (3) AHT reduction, because shorter calls at the same volume require fewer agents. (4) Occupancy optimisation, where operating at 85–88% occupancy rather than 75% extracts more productive hours per scheduled agent. (5) Channel shifting, where voice to chat reduces per-contact cost by 30–50% for contacts that can be served effectively in text. Wage reduction (offshore, automation) is sometimes discussed but often increases cost through quality degradation, higher attrition, and management overhead.

Cost per contact is the primary efficiency metric for contact centre operations: the amount it costs to handle one customer interaction. Understanding what drives it up and which levers genuinely reduce it (without pushing cost elsewhere) is central to sustainable WFM.

Calculating cost per contact

Formula

Cost per contact = Total operational cost ÷ Contacts handled

Include in total cost

→ Agent salary, NI, pension (directly staffed)
→ Supervisor, WFM, QA, L&D overhead
→ Telephony / ACD / CRM platform costs
→ Facilities (office space, IT, power)
→ Recruitment and onboarding (annualised)
→ Allocated indirect / corporate overhead

Use as denominator

→ Contacts handled (not offered)
→ Exclude abandoned calls (no agent time consumed)
→ Include all channels if calculating blended cost
→ Per-channel cost = channel cost ÷ channel volume
→ Exclude self-service if measuring agent-handled cost only

Use the staffing cost calculator to compute your fully-loaded cost per contact from agent headcount, salaries, and contact volume.

Cost per contact benchmarks by channel

Self-service contacts cost 20–50× less than agent-handled voice contacts. The channel mix is the single largest driver of total cost per contact in an omnichannel operation.

ChannelUK costKey drivers

Inbound voice (UK standard)

£4–£8

$5–$10 (US)

AHT 4–8 min, 1:1 agent:customer ratio; typical occupancy 85–88%

Inbound voice (regulated / complex)

£8–£15

$10–$18 (US)

Higher AHT (8–20 min), compliance overhead, lower occupancy

Live chat

£2–£5

$2.50–$6 (US)

Agent handles 2–4 concurrent sessions; lower AHT per session than voice

Email / ticket

£2–£4

$2.50–$5 (US)

Higher occupancy possible; no real-time SLA; async processing efficiency

Social media contact

£3–£7

$4–$8 (US)

Variable AHT; public-facing risk; typically lower volume per agent

IVR self-service

£0.05–£0.20

$0.05–$0.25 (US)

Telephony platform cost only; no agent cost; containment rate critical

Chatbot / web self-service

£0.02–£0.15

$0.02–$0.20 (US)

Platform / API cost; essentially zero agent cost for contained sessions

Benchmarks are fully-loaded costs including overhead allocation, not direct agent cost only. BPO outsourced operations typically run 20–40% lower than in-house due to wage arbitrage and higher occupancy, but this advantage is partially offset by management, quality, and coordination overhead.

Cost reduction levers — ranked by impact

Some levers reduce cost by genuinely improving efficiency. Others shift cost, lowering unit cost while increasing volume (more repeat contacts) or increasing attrition cost. The risk column reflects whether the lever has hidden cost transfer effects.

LeverImpactReduction estimateRisk of cost transfer

Self-service deflection

Guide →

Highest

30–60% of unit cost for deflected contacts (zero agent cost)

Low

FCR improvement

Guide →

Very high

1% FCR improvement → ~1–1.5% volume reduction → ~1% cost reduction

Low

AHT reduction

Guide →

High

Each minute of AHT reduction at 100 calls/hour ≈ 1.6 agents saved

Medium

Occupancy optimisation

Guide →

High

Moving from 75% to 85% occupancy = 13% more productive hours per scheduled agent

Medium

Channel shifting (voice → chat/email)

High

Shifting 20% of voice to chat = 8–12% blended cost reduction

Medium

Schedule adherence improvement

Guide →

Medium

Each 1pp adherence improvement = ~1% more productive hours per scheduled agent

Low

Attrition reduction

Guide →

Medium

Each 5pp attrition reduction ≈ 0.5–1% cost reduction (via recruitment and ramp cost)

Low

What drives cost per contact up

High AHT

Longer calls require more agent time per contact. AHT is the dominant driver of cost per call for inbound voice. A 1-minute AHT reduction at 100 calls/hour saves approximately 1.6 agents, or £100k+ annually at UK rates.

Low FCR / high repeat contact rate

Low FCR means more contacts per customer issue. If 25% of contacts are repeats from a prior contact, you're effectively paying for 1.25 contacts to resolve one customer problem. Each 1% FCR improvement removes ~1.5% of total volume and a proportional share of cost.

Low occupancy

Agents scheduled but not on calls are paid for unavailability. Operations with 70% occupancy pay for 43% more agent hours than necessary to handle the same volume at 88% occupancy. Small teams inherently run lower occupancy due to Erlang C's efficiency curve, and scaling up is the only fix.

High attrition and ramp overhead

Each agent replaced incurs recruitment cost (£1,000–£3,000+), training cost, and ramp lag (new agents contribute 60–80% of tenured throughput for 4–16 weeks). High attrition operations pay a significant invisible overhead on top of their agent salary cost.

Process inefficiency and system fragmentation

Agents navigating 4–6 systems per call (CRM, billing, order management, policy system, knowledge base, ticketing) spend a significant proportion of AHT on system switching rather than customer value. Each disconnected system adds 20–45 seconds of AHT per call.

Cost per contact questions

What is the average cost per call in a UK contact centre?

UK inbound voice: £4–£8 for standard operations; £8–£15 for regulated/complex environments. Live chat: £2–£5 per contact. Email/ticket: £2–£4. IVR self-service: £0.05–£0.20. Chatbot/web self-service: £0.02–£0.15. The 20–50× cost gap between agent-handled and self-service contacts makes deflection the highest-leverage cost lever.

How do you calculate cost per contact in a contact centre?

Cost per contact = total operational cost ÷ contacts handled. Total cost includes agent salaries, NI, pension, management overhead, technology, facilities, and allocated indirect costs. Use contacts handled (not offered) as the denominator, because abandoned calls consumed no agent time and should not be included.

What is the best way to reduce cost per contact?

Ranked by impact: (1) Self-service deflection, which eliminates agent cost entirely for deflected contacts. (2) FCR improvement, which removes repeat contacts. (3) AHT reduction, meaning fewer agent minutes per contact. (4) Occupancy optimisation, giving more productive hours per scheduled agent. (5) Channel shifting voice to chat, with 30–50% lower unit cost for suitable contacts. Wage reduction (offshore, automation) is often discussed but frequently increases total cost through quality degradation, higher attrition, and management overhead.

What is the difference between cost per call and cost per contact?

Cost per call specifically measures inbound voice contacts. Cost per contact (or cost per interaction) is broader, covering all channels including chat, email, and social. For omnichannel operations, cost per contact is the comprehensive metric. Some operations exclude self-service from the denominator to show pure agent-handled cost.