Missed Call Cost Calculator (Free)

Every call that goes to voicemail is a customer who might call the next business on the list. This free calculator estimates what missed calls cost you per month and per year, using your own numbers, and compares that with the price of an AI answering service. Nothing you type is sent or stored; the math runs in your browser.

Missed calls per weekCheck your phone’s call log for a typical week. Share of missed calls that are new potential customers (%)Exclude spam, suppliers and existing customers calling back. Share of those you’d normally win if you answered (%)Your usual closing rate on phone inquiries. Average value of a new job or customer ($)Use the first job’s value, or a year of value for recurring customers. Monthly cost of an AI answering service ($)Entry plans in our comparison range from about $25 to $150 a month.

Estimated revenue lost to missed calls:

$0 per month

$0 per year · about 0 lost jobs a month

How the calculation works

The formula is deliberately simple so you can check it by hand:

lost jobs per month = missed calls per week × 52 ÷ 12 × % new customers × % you'd win
lost revenue per month = lost jobs per month × average job value

With the example values (10 missed calls a week, 40% new customers, 30% win rate, $300 average job), that is 10 × 4.33 × 0.4 × 0.3 ≈ 5.2 jobs, or about $1,560 a month. The default numbers are only an example, not industry averages. Your result is only as good as the numbers you enter, so take them from your call log and your own sales records.

What the calculator doesn’t include

Callers who leave a message and still hire you. If you call back quickly, some missed calls aren’t lost. Lower the “new customers” percentage to reflect that.
Repeat business and referrals. A recurring cleaning client or a maintenance contract is worth more than the first job. Use a yearly value if that’s your model.
Your time. Answering calls mid-job also has a cost: interrupted work and longer days.

What to do with the result

Small number (under the cost of a service): set up a clear voicemail greeting, a text-back message for missed calls (most business phone apps offer one) and a rule to return calls within an hour.
Large number: compare AI answering services on your call volume. Our AI receptionist comparison lists 2026 prices and works through the cost for 120 calls a month.
Trades and home services: see how answering fits with scheduling and follow-ups in our guides for contractors and plumbers.

Last updated: October 20, 2026. This tool gives an estimate for planning purposes, not financial advice.