FinToolSuite

Telecoms Cost Audit Calculator

Updated April 17, 2026 · Financial Health · Educational use only ·

Business telecoms spend audit.

Calculate total telecoms monthly cost and estimated savings from mobile, broadband, and landline audit. Enter mobile lines and see the result instantly.

What this tool does

This tool calculates total telecoms cost and potential savings from mobile lines, broadband, and landlines.


Enter Values

Formula Used
Lines
Cost/line
Sites
Cost/site
Landline

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Disclaimer

Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.

Business telecoms costs add up across mobile lines, broadband, and landlines. Most mid-sized businesses spend 200-2,000/month on telecoms but rarely audit. A structured audit typically finds 15-25% in savings through contract renegotiation, line consolidation, and removing unused services.

100 mobile lines × 25/line + 5 broadband sites × 80/site + 200 landlines = 2,500 + 400 + 200 = 3,100/month, 37,200/year. Estimated 20% potential savings: 7,440/year achievable through renegotiation and consolidation alone - often a 1-hour procurement task.

Common waste areas: unused mobile lines (employees left, SIMs never cancelled), over-provisioned data plans (paying for unlimited when 5GB would suffice), legacy ISDN lines (replace with VoIP), separate providers where bundle deals exist. Each typically saves 5-10%; combined 15-25%.

A worked example

Try the defaults: mobile lines of 100, mobile cost per line of 25, broadband sites of 5, broadband cost per site of 80. The tool returns 3,100.00. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.

What moves the number most

The result responds to Mobile Lines, Mobile Cost per Line, Broadband Sites, Broadband Cost per Site, and Landline Cost Monthly. Frequency and unit price pull the total in different directions. The biggest surprise for most people is how small recurring amounts compound into large annual figures — that's where this calculation earns its keep.

The formula behind this

Total = (mobile lines × cost) + (broadband sites × cost) + landline. Potential savings estimate = 20% of total. Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.

What to do with a low result

A disappointing result is information, not a judgement. Pick the single input that dragged the figure down most and focus the next quarter on that one factor. Breadth-first improvement rarely works; depth-first on the worst input usually does.

What this doesn't capture

The score is a composite of the inputs you provide. Life context — job security, family obligations, health, housing — doesn't appear in the math but shapes the real picture. Use the number as a prompt, not a verdict.

Example Scenario

100 × £25 £ + 5 × £80 £ + £200 £ = $3,100.00.

Inputs

Mobile Lines:100
Mobile Cost per Line:25 £
Broadband Sites:5
Broadband Cost per Site:80 £
Landline Cost Monthly:200 £
Expected Result$3,100.00

This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.

Sources & Methodology

Methodology

Total = (mobile lines × cost) + (broadband sites × cost) + landline. Potential savings estimate = 20% of total.

Frequently Asked Questions

How often to audit?
Annually minimum. Before any contract renewal. After company restructuring. Most savings found in first audit; subsequent audits catch creep (new lines added without removing old ones).
Unused lines common?
Very. Typical 10-15% of mobile lines are inactive (employees left, project ended, spare SIMs). Each at 20-30/month = 2,400-4,320/year per 10 unused lines. Quick win.
Bundle vs separate providers?
Single provider for mobile + broadband + voice: 15-25% cheaper than separate, simpler billing, one SLA. Trade-off: single point of failure and potentially weaker individual service. Most mid-sized businesses benefit from bundling.
ISDN vs VoIP savings?
ISDN lines are legacy technology at 300-500/month for equivalent VoIP capacity at 50-150/month. ISDN switch-off ongoing. Migrating saves 60-70% and improves features. If still on ISDN: switch immediately.

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