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

Session margin calculator

Calculate contribution margin per session after variable costs. See £ and % margin for physio and private clinic pricing decisions.

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 session margin calculator is publisher content for UK private clinics, therapists, and physios. You supply session fee and variable costs for the session. It reports contribution per session and margin as % of fee using the simplified assumptions described below—not as a substitute for an accountant, solicitor, or clinical record.

Contribution margin per session shows how much each appointment contributes toward rent, salaries, and equipment after direct variable costs.

Choose variable costs honestly—some clinics treat marketing or laundry as fixed; consistency matters more than the exact label.

What this model does not do

This session margin calculator is original publisher copy for UK private clinic administration. It is not a tax computation and does not apply HMRC rates, capital allowances, or Making Tax Digital rules.

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 session margin calculator, not a generic form template. Use the same definitions you already use in the diary or management accounts.

Session fee
Enter session fee using the same definition you use in your clinic records.
Variable costs for the session
Enter variable costs for the session 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 session fee

    For this Session margin model, enter session fee and variable costs for the session. Keep those definitions consistent with your diary or management accounts.

  2. Read contribution per session

    The session margin model then reports contribution per session and margin as % of fee. The arithmetic runs in your browser; we do not receive the numbers you type.

  3. Check against costs, margins & tax records

    Treat contribution per session and margin as % of fee as planning figures for costs, margins & tax conversations, then confirm VAT, contracts, and filings with your own records and qualified advisers.

Context and how to use this

Contribution margin per session is fee minus variable costs you truly avoid if the session disappears—consumables, merchant fees, sometimes laundry.

Fixed costs like rent stay in the clinic either way; do not load them into this line unless your finance team does so by policy.

Common questions

Can margin exceed 100% of fee?
No. If it does, variable costs are negative or misclassified.
Mixed service lines?
Use an average or run separate scenarios per appointment type.

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Related guides

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