Missed calls calculator
Uses only the figures you enter. Nothing is sent anywhere. Fields marked optional can be left blank.
Example result (10 missed calls a week, 50% new enquiries, 30% usually become customers, £400 a customer). Put in your own figures above to replace it.
| A week | A month | A year | |
|---|---|---|---|
| New enquiries missed | 5 | 21.7 | 260 |
| Customers you may have lost | 1.5 | 6.5 | 78 |
| Revenue at risk | £600 | £2,600 | £31,200 |
Working: 10 × 50% = 5 new enquiries a week; 5 × 30% = 1.5 customers; 1.5 × £400 = £600 a week; × 52 ÷ 12 = £2,600 a month; × 52 = £31,200 a year. This is an illustration with made-up inputs, not typical figures.
Missed calls calculator results at a glance
What the calculator gives for some example figures. These inputs are made up to show how the sum behaves, not typical rates: use your own. Click a row to open the calculator with those figures filled in.
| Missed calls | New enquiries | Become customers | Value of a customer | Ring back anyway | Customers lost a month | Revenue at risk a month | A year |
|---|---|---|---|---|---|---|---|
| 5 a week | 50% | 30% | £400 | None | 3.3 | £1,300 | £15,600 |
| 10 a week | 50% | 30% | £400 | None | 6.5 | £2,600 | £31,200 |
| 10 a week | 50% | 30% | £400 | 40% | 3.9 | £1,560 | £18,720 |
| 20 a week | 40% | 25% | £250 | None | 8.7 | £2,167 | £26,000 |
| 10 a week | 60% | 50% | £60 | None | 13 | £780 | £9,360 |
| 3 a week | 70% | 40% | £2,000 | None | 3.6 | £7,280 | £87,360 |
| 30 a month | 50% | 30% | £400 | None | 4.5 | £1,800 | £21,600 |
Missed calls calculator: key facts
- The basic sum is missed calls × % that are new enquiries × % that usually become customers × value of a customer.
- The calculator turns weekly figures into monthly ones by multiplying by 52 and dividing by 12 (about 4.33 weeks a month), and into yearly ones by multiplying by 52.
- The most useful input is a real count of missed calls from your phone system, mobile or phone provider's account over a normal week, with repeat attempts from the same caller counted once.
- Not every missed call is lost business: existing customers, suppliers, wrong numbers and sales calls usually shouldn't count as new enquiries.
- If some missed callers ring back anyway, you can take them off. The honest way to get that figure is to check your own call log: how many missed numbers later got through.
- Revenue at risk isn't profit. For a stricter test against a cost, use the profit on a typical customer instead of its value.
- Sometimes the numbers say you don't need call answering: a few missed calls, mostly from existing customers, can often be fixed with routing, a better voicemail greeting or a callback rule.
- Businesses can't stop every sales call, but companies' marketing callers must screen numbers against the Corporate Telephone Preference Service (CTPS) and the TPS.
How does the missed calls calculator work it out?
It multiplies the missed calls by the % that are new enquiries, takes off any callers who ring back anyway, multiplies by the % who usually become customers, then by the value of a customer. Weekly figures × 52 ÷ 12 give a month and × 52 give a year.
- Missed calls a week = your weekly figure, or a monthly figure × 12 ÷ 52.
- New enquiries missed = missed calls × the % that are new enquiries × (100% − the % who ring back anyway, if you enter one).
- Customers you may have lost = new enquiries missed × the % that usually become customers.
- Value of a customer = the value of a first job or order, or, if you tick lifetime value, value × purchases a year × years they stay.
- Revenue at risk = customers lost × value of a customer, a week; × 52 ÷ 12 for a month (about 4.33 weeks); × 52 for a year.
- Break-even (optional) = a monthly cost ÷ value of a customer = the extra customers a month needed to cover it.
What you enter, and what it assumes
- Inputs: missed calls a week or a month; % that are new enquiries; % of new enquiries that usually become customers; value of a new customer; optionally lifetime value (times a year a customer buys and years they stay), % who ring back anyway, and a monthly cost to compare against.
- Assumptions: there are none of ours. Every rate comes from you: we don't use industry averages or survey figures about missed calls or hang-ups, because they may not reflect your business. The only fixed figures are 52 weeks a year and 12 months a year.
- Exclusions: it doesn't predict how many of the lost customers you'd actually win back, your capacity to take on more work, profit (unless you enter profit as the value), or the cost of any fix beyond the figure you enter.
- Pre-filled links: add
calls,period(week or month),new,convert,valueand, if needed,ltv(yes),peryear,years,backorcostto the address and the result shows when the page opens. For example /missed-calls-calculator?calls=10&new=50&convert=30&value=400.
How do I count how many calls I miss?
Pull the missed or unanswered calls from your phone system's call log, your mobile's missed calls list, or your phone network provider's online account, for a normal week. Count each caller once, even if they tried several times, and include calls that went to voicemail or rang out.
This is the one number the calculator can't guess, and it's the one most people underestimate or overestimate. A few minutes with your call records is worth more than any rule of thumb.
Where missed calls show up
- Business phone system or app. Many cloud phone systems have a call log or report that shows missed, unanswered or abandoned calls by day and time. Look for a filter for inbound calls that weren't answered.
- Your mobile. If your business number rings through to your mobile, the recent calls list shows missed calls. Remember it won't show calls to the landline that didn't forward.
- Your phone network provider's online account. Some providers show incoming calls, including unanswered ones, in an online portal or itemised bill. Others only list outgoing calls, so check before relying on it.
- Voicemail. Voicemails are only the callers who left a message. Count them, but don't treat them as your total.
- A tally. If nothing records missed calls, ask whoever is nearest the phone to note every call they couldn't get to for a week, with the time.
Count it properly
- Pick normal weeks. Avoid weeks with a bank holiday, a staff holiday or an unusual promotion, or note them separately.
- Count callers, not attempts. If the same number rang three times in ten minutes, that's one missed caller. Counting attempts can make the result look several times bigger than it is.
- Include every way a call goes unanswered: rang out, went to voicemail, line busy, or the caller hung up while waiting in a queue.
- Note the times. Missed calls bunched at lunchtime, first thing on Monday or after 5pm point to different fixes, which matters later.
- Don't forget out-of-hours calls if callers can reach you then. They're missed calls too, though you may decide they don't need answering. See out of hours call answering.
If you're also counting all your calls for a quote, how to work out your call volume covers the wider picture.
Which missed calls actually cost you money?
Mainly missed new enquiries: people who might have become customers. Existing customers usually call back or get in touch another way, and sales calls, wrong numbers and suppliers don't cost you business. That's why the calculator asks what share of missed calls are new enquiries.
A missed call from someone ringing round for a quote is very different from a missed call from a cold caller. Splitting your missed calls into rough groups gives you the % for the second box in the calculator.
| Type of caller | What a missed call can mean | Count as a new enquiry? |
|---|---|---|
| New enquiry: quote, booking, "are you available?" | Possibly a lost customer, if they go elsewhere | Yes |
| Existing customer with a question | Usually a delay, not a loss. Repeated misses can still damage the relationship | No (but note them) |
| Existing customer with a problem or complaint | Often the most frustrating call to miss; can affect repeat business | No, but treat as important |
| Supplier, recruiter, delivery driver | An inconvenience, rarely lost revenue | No |
| Sales call, nuisance or wrong number | Nothing lost | No |
How to tell them apart
- Known numbers. If a missed number matches a customer or supplier in your phone contacts or customer records, it isn't a new enquiry.
- Voicemails and callbacks. What people said, or who they turned out to be when you called back, tells you the mix for the calls you can identify. Use that mix as a rough guide for the rest.
- Withheld and unknown numbers are the hardest. Don't assume they're all customers, or all cold callers.
Sales calls to your business
If a large share of your missed calls are cold sales calls, that's worth knowing before you pay to have them answered. Under the rules the ICO enforces, organisations making live marketing calls must not call numbers registered with the Telephone Preference Service (TPS) or Corporate TPS (CTPS) unless the person has specifically consented. Sole traders and some partnerships register with the TPS; companies, some partnerships and government bodies register with the CTPS. It won't stop every unwanted call, and it doesn't cover scammers who ignore the rules, but it can cut down legitimate cold calls.
Don't callers just ring back if I miss them?
Some do and some don't, and the mix varies a lot between businesses, so we don't use a general figure. The best evidence is your own call log: check how many missed numbers called again and got through, or that you reached when you called back. Enter that % in the optional box.
You'll see confident claims online about how many callers never ring back. We don't use any of them, because the answer depends on your business, your callers and how urgent their need is. What's useful is understanding why a caller might not try again, and then checking your own numbers.
Common reasons a caller doesn't try again
- They're ringing round. Someone working through a list of local businesses may simply move to the next one if you don't answer.
- The need is urgent. A burst pipe, a locked-out tenant or a same-day appointment won't wait for a callback tomorrow.
- They called at the only moment they could. On a break, between meetings or on the school run, and they won't be free again until later.
- There was nothing to tell them what happens next. A voicemail greeting that doesn't say when you'll call back, or no voicemail at all, gives them no reason to wait.
- You can't call them back. If the number was withheld and they didn't leave a message, the next move is entirely theirs.
- They got in touch another way, by email, a web form or a message. That's not a lost enquiry, so don't count it as one.
How to measure your own callback rate
- Take the missed calls you counted for one normal week.
- For each number, check the call log for the next few days: did the same number call again and get answered?
- Check which ones you reached by calling back, and which ones got in touch by email or a form instead.
- Divide the ones who got through by the total, and use that as the % in the optional "ring back anyway" box. Leave it blank if you can't tell.
Be careful with callbacks that you made: if you rang them back and they'd already booked elsewhere, that call doesn't count as a recovered enquiry.
How do I turn the result into a decision?
Treat the result as a range, not a single answer. Run it again with cautious figures, compare the lower result with the cost of any fix, and check you could actually serve the extra customers. If the cautious version still covers the cost comfortably, the numbers support doing something.
A single result can look more precise than it is. These steps turn it into something you can act on.
- Run a cautious version. Lower the % of new enquiries and the conversion rate a little, use the first-job value rather than lifetime value, and add a callback % if you have one. If the result still matters to you, it's probably real.
- Think profit, not revenue. A £400 job with £300 of materials and labour isn't worth £400 to you. Put the profit on a typical customer into the value box for a stricter test.
- Compare like with like. Put the monthly cost of a fix into the optional box: a call answering quote, the cost of extra staff hours, or a new phone feature. The break-even line tells you how many extra customers a month would cover it.
- Ask whether that's realistic. If you'd need to win back nearly every lost customer to break even, the case is weak. If a small share would cover it, it's stronger. Neither is a guarantee.
- Check your capacity. Answering more calls only helps if you can take on the work. If you're already booked weeks ahead, more enquiries may just mean more people to turn away politely.
- Look at when the calls are missed. Calls missed only at lunchtime or only after 5pm need a different fix from calls missed all day.
When do the numbers say you don't need call answering?
When very few missed calls are new enquiries, when most missed callers get through later anyway, when a customer's value is low compared with the cost of a fix, or when you couldn't take on extra work. In those cases a cheaper fix, or no change, may be the sensible answer.
A calculator like this is only useful if it can tell you "no" as well as "yes". These are the signs the numbers don't support paying for call answering, at least for now:
- Your missed calls are mostly existing customers. They know you and usually try again or email. A clear voicemail greeting and a reliable callback habit may be enough.
- The new enquiries missed a month are a handful, and your conversion rate means the customers at risk round to less than one a month.
- The break-even line needs more customers than you're losing. If winning back every lost customer wouldn't cover the cost on your figures, the maths doesn't work.
- Your callback rate is high. If your call log shows most missed callers got through later, the real loss is small.
- The missed calls come at one predictable time that you can cover yourself, such as staggering lunch breaks.
- You're at capacity. If you can't serve more customers, answering more enquiries doesn't add revenue.
- Most missed calls are sales calls or wrong numbers. Paying to have those answered rarely makes sense.
Even then, it's worth re-running the numbers when something changes: a busy season, a new member of staff leaving, or an advert that brings in more calls.
What else can reduce missed calls without a call answering service?
Change how calls are routed so more phones ring, record a voicemail greeting that says when you'll call back, set a callback rule, publish accurate opening hours, stagger breaks, and give callers another way to reach you. These may be enough when missed calls are few or bunched at set times.
| Fix | What it does | Best when |
|---|---|---|
| Call routing (ring groups, forwarding to mobiles) | Rings more than one phone, or a mobile after a few rings, so someone else can pick up | Someone is usually free, just not at the desk |
| A better voicemail greeting | Tells callers who they've reached, when you'll call back and what to leave (name, number, what it's about) | Callers can wait a few hours |
| A callback rule | For example: check the missed calls list at 10am, 1pm and 4pm, and return every new enquiry the same day | Missed calls are spread through the day and not urgent |
| Accurate opening hours | Puts your phone hours on your website, listings and voicemail so people call when you're there | Lots of calls arrive just after you close |
| Staggered breaks and cover | Makes sure someone is near the phone at lunch and first thing | Missed calls bunch at the same times each day |
| Another way to get in touch | An enquiry form, online booking or email address in your greeting for callers who'd rather not wait | Many enquiries are simple bookings or quote requests |
| Overflow call answering | An outside receptionist answers only when your line is busy or rings out | The fixes above still leave new enquiries unanswered |
A sample voicemail greeting you can adapt:
"You've reached [business name]. Sorry we can't take your call right now. Please leave your name, number and a few words about what you need, and we'll call you back today if you call before 4pm, or tomorrow morning if it's later. You can also email us at [address]."
For a small team, call answering for small businesses goes through these options in more detail, including starting with overflow cover only.
What should I ask a call answering provider after using the calculator?
Ask what counts as a chargeable call, whether they can answer only overflow calls or set hours, how quickly messages reach you, whether they report on the calls they answer, whether there's a trial, and how they handle callers' personal data. Share your missed call figures so their quote fits your calls.
Your calculator inputs are a ready-made brief. Tell a provider roughly how many calls you miss, when, and what share are new enquiries. Then ask:
- What counts as a chargeable call? Are sales calls, wrong numbers, silent calls and very short calls charged? If many of your missed calls are nuisance calls, this changes the cost a lot.
- Can you answer only the calls I miss? Overflow cover (when the line is busy or rings out) or set hours, rather than every call.
- How do messages reach me, and how fast? Email, text, app, or a call put through. A new enquiry is only useful if you can call back while they're still interested.
- What will the receptionist say and collect? Can they take the details you need to quote or book, and follow your instructions on what not to say?
- Will I get a report? A list of calls answered, by time and type, lets you re-run this calculator with real numbers after a month.
- Is there a trial or short notice period? So you can test whether the numbers hold up before committing.
- How do you handle callers' personal data? A call answering service taking messages with callers' details is normally a processor under UK GDPR, and you need a written contract with it containing the terms required by Article 28.
For the full checklist, including test calls and red flags, see how to choose a call answering service. If you're weighing it up against employing someone, see virtual receptionist vs hiring a receptionist.
How do I check whether a fix has worked?
Count your missed calls again over a normal week a month or so after the change, track how many new enquiries came through messages or answered calls, and see how many became customers. Then re-run the calculator with the new figures and compare.
Whatever you change, from a new voicemail greeting to an overflow service, the same simple check tells you whether it was worth it:
- Write down your starting figures from the calculator today: missed calls a week, % new enquiries, conversion rate and value.
- Make one change at a time where you can, so you know what made the difference.
- After a month or so, count again over a normal week, the same way as before.
- Track the enquiries that came through the fix: messages taken, calls put through, callbacks made, and how many became customers.
- Re-run the calculator with the new missed calls figure and compare the revenue at risk before and after, against what the fix costs you.
If you use a call answering service, its call report makes this much easier. If the numbers haven't moved, it's a reason to change the set-up, narrow the hours or stop, not to keep paying out of habit.
Related guides
Missed calls calculator: frequently asked questions
How does the missed calls calculator work?
It multiplies the calls you miss by the share that are new enquiries, then by the share that usually become customers, then by the value of a customer. It shows the result a week, a month and a year, with the working, and can take off callers who ring back anyway.
How much do missed calls cost a business?
It depends entirely on the business: how many calls are missed, how many are new enquiries, how many of those would buy, and what a customer is worth. That's why the calculator uses your own figures rather than a general average. For one business a missed call may cost nothing; for another it may be a lost job.
Where do the numbers in the calculator come from?
All of them come from you. We don't use industry averages or survey figures, because they may not reflect your business. The only fixed figures are the conversions from weeks to months (52 weeks divided by 12) and to years (52 weeks).
What if I don't know how many calls I miss?
Check your phone system's call log, your mobile's missed calls list, or your phone network provider's online account. If none of those record missed calls, keep a tally by the phone for a normal week. Count a caller who tried several times once.
Should I use first-job value or lifetime value?
Start with the first-job value: it's simpler and more cautious. Lifetime value can be fairer for businesses with regular repeat customers, but the money comes in over years while any fix is paid for monthly, so compare both before deciding.
What conversion rate should I use?
Use your own: out of the new enquiries you do speak to, how many go ahead. If you don't track it, think about your last ten or twenty enquiries. Try a lower figure as well, as callers who couldn't get through may be less committed than those who did.
Do missed calls from existing customers count?
Not as new enquiries in this calculator, because existing customers usually try again or get in touch another way. They still matter for service and repeat business, so note how many there are, but leave them out of the new enquiry percentage.
What does the break-even line mean?
If you enter a monthly cost, such as a call answering quote, it divides that cost by the value of a customer. The answer is how many extra customers a month would cover the cost. It then compares that with the customers you may be losing on your figures.
Is the result a guarantee of extra sales?
No. It's an estimate based only on the figures you enter. Answering more calls may help you win more work, but results depend on your callers, how quickly you follow up, and whether you have the capacity to take on the work.
Is my information saved or sent anywhere?
No. The calculator runs in your web browser and nothing you type is sent to us or anyone else. It works without an internet connection once the page has loaded. Only the enquiry forms send information, and only if you fill one in and submit it.
Can I reduce missed calls without paying for call answering?
Often, yes. Ringing more than one phone, a voicemail greeting that says when you'll call back, a rule for checking and returning missed calls, accurate opening hours and staggered breaks can all help. Call answering tends to make sense when new enquiries are still being missed after that.
Sources
We checked the facts on this page against these sources on 11 November 2026: