Flow-Through

Flow-Through (also called drop-through) measures the proportion of incremental revenue that converts into incremental Gross Operating Profit (GOP), expressed as a percentage. It tells operators and owners how efficiently additional top-line revenue is translating to the bottom line after accounting for variable costs — in other words, how much of every extra euro or dollar in revenue actually "flows through" to profit.

Formula

Flow-Through (%) = (Change in GOP ÷ Change in Revenue) × 100

Where both changes are measured over the same comparable period (month-over-month or year-over-year).

Example

A hotel's total revenue increases by €50,000 year-over-year in March. Its GOP increases by €35,000 over the same period.

Flow-Through = (35,000 ÷ 50,000) × 100 = 70%

This means €0.70 of every additional euro in revenue reached GOP. A flow-through below 50% in the same scenario would signal that variable costs are rising nearly as fast as revenue.

Why it matters

Flow-through is a key indicator of operational leverage. Hotels have a largely fixed cost base (building, permanent staff, fixed overheads), so incremental revenue should, in theory, flow to the bottom line at a high rate. In practice, well-managed full-service hotels typically target flow-through of 60–75%. Low flow-through is a warning sign that variable costs — OTA commissions, variable labor, F&B inputs — are growing in step with revenue and eroding the benefit of top-line growth.

Revenue managers use flow-through analysis to evaluate the true profitability of different demand strategies. High-volume OTA bookings carrying a 20% commission generate significantly lower flow-through than lower-volume direct bookings at a comparable ADR. Understanding this trade-off is central to building a healthy channel mix.

Related

• GOPPAR (Gross Operating Profit per Available Room) — the absolute profit-per-room metric that flow-through ultimately drives
• RevPAR (Revenue per Available Room) — the top-line metric; increasing RevPAR without cost discipline can yield poor flow-through
• NRevPAR (Net Revenue per Available Room) — deducts distribution costs from RevPAR, offering a net revenue base that better predicts flow-through than gross RevPAR