Free calculatorReviewed 28 August 2026

Free void-cost calculator

Understand what an empty room is costing you

Use your own rooms, rent and vacancy assumptions to estimate the income lost during void periods.

This calculator is a decision aid, not financial advice or a guarantee of future occupancy.

Enter your void assumptions

Adjust the figures and calculate an illustrative annual and daily cost.

Your Portfolio Details

Number of rooms in your portfolio

8 rooms

Average monthly rent per room

£650

Use your average across all rooms

Typical void weeks per room per year

4 weeks

Use the void period you want to test for each room

🔴

£0

Annual void cost

📉

0.0%

% of gross income lost

📅

£0

Cost per empty room per day

🏠

£0

Avg daily void drain (annualised)

03Read the cost in contextReview which assumptions drive the estimate before using it in a decision.

Lost rent

Income that is not collected while the room is empty.

Daily cost

A practical view of how the annual estimate accumulates.

Portfolio exposure

The combined effect of the assumptions across every room entered.

Calculation methodology

The estimate uses only the rent, room and vacancy assumptions entered in the calculator.

04Check practical guidanceReview context, limitations and the next practical action.

Review your letting workflowConnect vacancy analysis to enquiry, viewing and application work.Track property performanceSee the Social Home workflow for keeping occupancy work visible.

05Connect the Social Home workflowMove from a one-off answer to visible, repeatable property work.

Keep the decision connected

Use Social Home to record the next action, connect evidence and monitor the wider portfolio workflow.

Only this tool’s identity is shared. Inputs, addresses, money values and results stay on this page.

Or explore the platform workflow

Continue the same decision with another focused tool.

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Frequently asked questions

Quick context for using this page responsibly.

How is void cost calculated?

The calculator multiplies the relevant rent by the period each room is assumed to remain empty, then combines the result across the rooms entered.

Is the result a forecast?

No. It is an illustrative estimate based on your assumptions and does not predict future occupancy.