Missed-Call Cost Calculator for Small Businesses

By Web Asset House Studio · October 29, 2026 · Runs in your browser; nothing you type is sent or stored.

Every business misses some calls. Whether that matters depends on who was calling and what they'd have spent. This calculator multiplies through your own numbers so you can see the cost and compare it with the price of voicemail upgrades, an answering service or an AI receptionist.

Your numbers only. The starting values below are placeholders to show how the math works. They are not industry averages or benchmarks, and the calculator has no built-in statistics. Replace each one: your phone system's call log shows missed calls, and your bookings and invoices show close rates and job values.

Missed calls per week Share of missed callers you still reach (they leave a message you return, or call back) (%) Share of the remaining callers who were new prospective customers (%) Share of prospects you normally book when you do answer (%) Average revenue from a first job or order ($) Jobs or orders a new customer brings in total (1 = first job only) Gross margin (%; optional, to see profit rather than revenue) Monthly cost of an answering option you're considering ($; optional)

This calculator needs JavaScript turned on. It runs entirely in your browser: nothing you type is sent anywhere or stored, and the page sets no cookies.

What missed calls may be costing you

Callers lost per week	—
Customers lost per week	—
Customers lost per month	—
Revenue lost per week	—
Revenue lost per month	—
Revenue lost per year	—
Gross profit lost per month	—
Gross profit lost per year	—
Break-even for the answering option	—

Formulas used

Callers lost = missed calls × (1 − share you still reach).
Customers lost = callers lost × share who were new prospects × your close rate.
Revenue lost = customers lost × average first-job value × jobs per customer. Per month = weekly × 52 ÷ 12; per year = weekly × 52.
Gross profit lost = revenue lost × gross margin.
Break-even = monthly cost ÷ profit per customer (or revenue per customer if you leave margin blank): how many recovered customers a month would pay for the option.

Worked example (placeholder numbers)

10 missed calls a week; you still reach 20%, so 8 callers are lost. Half were prospects (4), and you'd normally book 30% of them: 1.2 customers a week. At $400 each that's $480 a week, about $2,080 a month and $24,960 a year in revenue. With a 40% gross margin, that's about $832 a month in gross profit. An option costing $300 a month would break even at 1.875 recovered customers a month.

Using the result

Check which hours the missed calls happen in. After-hours calls and calls during jobs often need different fixes; see voicemail vs. answering service vs. AI receptionist.
Unknown-number callbacks may go unanswered if your number is labeled as spam; see why business calls get marked "Spam Likely".
If a tool records or transcribes calls, check the consent rules in our call recording guide.

Sources

This calculator is arithmetic on the numbers you enter. It uses no outside data or statistics, so there are no figures to cite.