WAULT calculator
Enter your leases and get the Weighted Average Unexpired Lease Term to expiry and to break, weighted by contracted rent or floor area. Nothing is uploaded or stored; the calculation runs entirely in your browser.
Calculator
| Property / lease | Annual rent | Floor area (m²) | Lease expiry | Break date (optional) |
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Weighted by contracted annual rent. Leases already past their expiry (or break) as at the chosen date contribute a term of zero. WAULT to break uses the earlier of the break date and the expiry date.
What is WAULT, and why is it fiddly?
WAULT — Weighted Average Unexpired Lease Term — is the average time left on the leases in a property or portfolio, weighted by each lease's rent (or floor area). It is one of the clearest signals of income durability and leasing risk, which is why investors, valuers and lenders all ask for it.
It is also easy to get wrong by hand. You have to weight every lease, handle break dates separately from expiries, get the date arithmetic right, and keep it current as leases are signed, renewed and broken. Across a real portfolio that usually means a fragile spreadsheet that someone has to rebuild each reporting cycle.
How it is calculated
For each lease, multiply the weighting (contracted annual rent, or floor area) by the unexpired term in years. Add those up across every lease, then divide by the total weighting:
WAULT = Σ (weighti × yearsi) ÷ Σ weighti
Rent-weighting reflects income durability and is the most quoted version; area-weighting strips out rent differences and shows the average term across space. WAULT to break uses the earliest date a tenant could leave (the earlier of any break and the expiry); WAULT to break is always the more conservative of the two.
Calculating this across a live portfolio?
WAULT is one KPI. STREETS computes it from validated lease and rental data, and consolidates the data behind your wider portfolio reporting — no rebuilt spreadsheet each cycle. See it on your own numbers.
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