Cap Rate Calculator

The single metric most property investors learn first

Capitalisation rate (cap rate) is the property investment world's equivalent of dividend yield: annual net operating income divided by the property's value. A property generating 15,000 net annual income worth 300,000 has a cap rate of 5%. Cap rate is the standardised comparison measure across property investments — it lets you compare a 250,000 HMO in against a 1.2m office in on an apples-to-apples basis. The calculator above produces the number; the commentary below is about how to use it intelligently.

What "net operating income" includes

Cap rate's credibility depends on NOI being calculated honestly. Real NOI = gross rent - vacancy allowance - operating expenses. Operating expenses include: property management fees (typically 8-12% of rent if using a manager), repairs and maintenance (budget 5-10% of rent), insurance, local property tax (if landlord-paid), service charges, ground rent (for leasehold). NOI excludes: mortgage payments (separate from the property itself), income tax on rental profits, capital expenditures that extend property life (new roof, kitchen replacement). Getting these categorisations right matters — inflating NOI by omitting costs inflates cap rate and makes bad deals look good.

Cap rate benchmarks by property type

Typical cap rate ranges for property categories:

Prime residential: 2.5-4%. Low yields reflect capital preservation and currency-hedging demand from international buyers.

Regional residential: 4-6% for standard buy-to-let. Higher in the North and; lower in the South East.

HMO (House in Multiple Occupation): 7-12%. Higher yields compensate for more management overhead and regulatory complexity.

commercial (office, retail): 5-10% depending on tenant quality and location. Prime office 3-4%; regional secondary retail 8-10%+.

industrial: 5-7% for warehouses and logistics properties — currently the hottest sector due to e-commerce demand.

Cap rates outside these ranges warrant scrutiny. Anything above the typical range for the category usually reflects higher risk (vacancy risk, tenant concentration, building quality issues, location challenges). Anything below reflects either outstanding quality or overpricing.

Cap rate vs yield vs ROI

Three confused terms that measure different things:

Cap rate: NOI / property value. Unlevered income yield on the asset. Independent of how it's financed.

Gross yield: Gross rent / property value. Doesn't account for expenses. Common in marketing; often misleadingly high.

ROI (cash-on-cash return): Annual cash flow after mortgage / cash invested. Accounts for leverage. Typically higher than cap rate for mortgaged properties.

A property with 6% cap rate might have a 15% cash-on-cash ROI at 75% loan-to-value. The cap rate hasn't changed; the ROI reflects the leverage effect. Comparing investments requires specifying which metric — cap rate for asset quality, ROI for leveraged returns.

What cap rate doesn't capture

Cap rate is a one-year snapshot. It misses:

Capital growth: A property with 5% cap rate plus 5% annual capital growth produces roughly 10% total return per year. A property with 7% cap rate and 1% capital growth produces 8%. The lower-cap-rate property wins. Cap rate alone understates prime-market properties and overstates high-yield properties in declining areas.

Future rent growth: Properties in growth areas see rent rising over time. A 5% cap rate today with 3% annual rent growth produces a rising income stream. A 7% cap rate in a stagnant area stays at 7% yield forever. Present cap rate doesn't reflect this trajectory.

Property risk: Single-tenant commercial properties with long leases appear to have low cap rates; they're implicitly pricing low risk. Multi-tenant properties with shorter leases have higher cap rates partly as risk compensation. Same numerical cap rate can represent very different risk profiles.

The cap rate expansion risk

Cap rates move with interest rates. When rates rise, cap rates typically follow — not instantly, but over 1-3 years. Property values fall as cap rates rise (same NOI at higher cap rate means lower value). Commercial property saw cap rates expand from 4-5% to 6-7% during 2022-2024 as rates rose, dropping prime office values by 20-30%. Investors buying at historical-low cap rates during low-rate periods often see nominal losses when rates rise. Using historical-normal cap rates for your valuation — not recent-peak ones — produces more durable investment decisions.

Value-add cap rate math

The "value-add" strategy uses cap rate mechanics to create value: buy an underperforming property at a high cap rate (say 8%), renovate and re-lease at higher rents, and refinance or sell at the lower cap rate typical of well-performing properties (say 6%). The same 20,000 NOI values at 250,000 (at 8%) versus 333,000 (at 6%) — a 83,000 value creation purely from cap rate compression, before any actual improvement in NOI. Add NOI improvement from better rents, and the compound gain can be substantial. This is the entire thesis of professional property value-add investors.

HMO specifically — higher cap rates with higher overhead

HMO cap rates of 8-12% look attractive against standard buy-to-let 4-6%. The higher yield reflects:

Higher tenant turnover (average stay 8-18 months vs 24-36 for family lets).
Higher management overhead (multiple rent collections, multiple tenancies, more repair calls).
Regulatory compliance (licensing, HMO-specific fire safety, periodic inspections).
Higher capex (more wear and tear, more frequent redecoration).
Selective universe of buyers on exit (HMOs sell to HMO investors, limiting liquidity).

Net after all these factors, a 10% gross HMO cap rate often produces 6-7% effective return — similar to standard buy-to-let. The HMO premium is partly compensation for complexity, not pure extra yield. Investors should run HMO analysis with honest overhead allowances rather than assuming the gross yield flows to the bottom line.

The cap rate comparison that matters

The most useful cap rate comparison isn't against similar properties — it's against your cost of capital. If you can borrow at 5% interest rate, a 5% cap rate property produces zero leveraged return (rent covers mortgage exactly, no surplus). A 7% cap rate with 5% debt produces 2% positive leverage before accounting for capital appreciation. A 10% cap rate with 5% debt produces 5% positive leverage. The debt market determines the floor cap rate that makes property investing worthwhile. When debt rates rise, minimum viable cap rates rise with them.

What this calculator produces

The tool computes cap rate from property value and net operating income. It doesn't adjust for vacancy, validate NOI calculations, or compare against market benchmarks. Use the figure as the standardised income-yield measure for comparing properties or evaluating a specific investment against your hurdle rate. For full investment analysis, layer cap rate onto cash-on-cash return, expected capital growth, and risk assessment.