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Published by Clinic Admin Tools UK · Independent practice-admin content · Not clinical advice

Missed appointment loss calculator

Estimate revenue left on the table when patients do not attend or last-minute gaps are not refilled.

Planning tool only Figures are for illustration. They are not financial, tax, legal, or clinical advice, and they may not match your contracts or accountant’s treatment.

What this calculator covers

This missed appointment loss calculator is publisher content for UK private clinics, therapists, and physios. You supply missed or empty slots and average fee you would have charged. It reports estimated lost gross revenue using the simplified assumptions described below—not as a substitute for an accountant, solicitor, or clinical record.

No-shows and late cancellations have a direct effect on clinic revenue. Multiplying missed slots by a typical session fee gives a rough picture of opportunity cost over a week or month.

This does not include goodwill or long-term retention effects—only a simple revenue snapshot for planning.

What this model does not do

This missed appointment loss calculator is original publisher copy for UK private clinic administration. It does not judge clinical quality, CQC expectations, or whether a utilisation target is safe for the caseload.

The form cannot see your contracts, payer mix, or diary software. If a clause matters and there is no field for it, the output will not include it.

How this model defines the inputs

These notes are specific to the missed appointment loss calculator, not a generic form template. Use the same definitions you already use in the diary or management accounts.

Missed or empty slots
Enter missed or empty slots using the same definition you use in your clinic records.
Average fee you would have charged
Enter average fee you would have charged using the same definition you use in your clinic records.

Calculator

Enter your figures below. Results update as you type, in your browser—we do not receive the numbers you enter.

Tip: Use whole numbers or up to two decimal places. Results update instantly.

How it works

  1. Enter missed or empty slots

    For this Missed appointment loss model, enter missed or empty slots and average fee you would have charged. Keep those definitions consistent with your diary or management accounts.

  2. Read estimated lost gross revenue

    The missed appointment loss model then reports estimated lost gross revenue. The arithmetic runs in your browser; we do not receive the numbers you type.

  3. Check against operations & capacity records

    Treat estimated lost gross revenue as planning figures for operations & capacity conversations, then confirm VAT, contracts, and filings with your own records and qualified advisers.

Context and how to use this

Putting a number on empty slots helps justify reminders, waitlist backfill processes, or policy changes. The tool multiplies missed slots by a fee you judge realistic for that diary.

Separate structural gaps (no demand) from DNAs if your improvement projects target different levers.

Common questions

List price or discounted fee?
Use the fee you would most often have earned for that appointment type. Blended averages are fine for a monthly snapshot.
Is this lost profit?
No—this estimates lost gross revenue. Net loss would subtract variable costs you avoid when the slot is empty.

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Related guides

Benchmarks and how-tos that explain how clinics use this metric: