How should a hotel calculate blended CPA across paid search, metasearch, and social channels?

To calculate blended cost per acquisition, divide your total direct marketing expenditure across paid search, metasearch, and social campaigns by the total direct bookings generated across those channels during a matching booking window.

Hotels frequently analyze advertising channels in silos, obscuring true distribution costs while online travel agencies (OTAs) charge 15% to 25% in commissions per reservation. Calculating a unified blended acquisition figure allows property leadership to measure marketing portfolio efficiency directly against third-party intermediary expenses.

If you only do one thing: Target a blended acquisition cost below 10% to 12% of direct booking revenue to ensure cross-channel marketing consistently outperforms standard OTA commission rates.

1. Aggregate cross-channel media spend: Sum all gross media expenditure across Google Ads, Google Hotel Ads, Trivago, Kayak, and Meta platforms within a synchronized 30-day or 90-day window.
2. Include agency and software overhead: Add fixed agency retainers (typically $2,000 to $12,000 monthly) alongside booking engine fees and metasearch connectivity charges to calculate your total commercial outlay.
3. Extract confirmed direct booking data: Export verified direct bookings from your central reservation system (CRS) or booking engine, isolating paid-touchpoint transactions across that same 30-day to 90-day period while excluding walk-in, phone, and organic direct traffic.
4. Calculate dollar cost per booking: Divide your total combined spend by the total count of direct paid bookings to find the unit cost per acquisition, which typically sits between $25 and $65 per reservation for boutique and independent hotels.
5. Calculate effective acquisition percentage: Divide total direct acquisition cost by the total gross booking revenue generated, then multiply by 100 to calculate your net blended marketing cost percentage.

• Watch out for: Last-click attribution bias across a 30-day window, which credits bottom-funnel metasearch or brand search while masking top-funnel social campaigns that generated the initial booking intent.
• Watch out for: Unadjusted cancellation rates of 15% to 30%, which artificially depress your acquisition cost when calculated against gross reservations rather than net stayed room revenue.
• Watch out for: Misaligned reporting windows, such as comparing monthly ad spend against guest stay dates rather than real-time booking transaction dates.

Audit your last 90 days of media spend, software fees, and booking engine transactions to benchmark your blended acquisition percentage against your current distribution mix.