Can margin exceed 100% of fee?

No. If it does, variable costs are negative or misclassified.

Use an average or run separate scenarios per appointment type.

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

Session margin calculator

Subtract variable costs from a session fee to see contribution before fixed overheads.

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.

Adjust the fields below; results update as you type. All processing happens in your browser—we do not receive the numbers you enter.

Session fee

(£)

Variable costs for the session

(£)

Contribution per session —

Margin as % of fee —

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.

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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