Turbine Spacing & Wake Loss Calculator
When wind passes through a turbine rotor, it slows and becomes turbulent downstream — a wake that reduces the output of any turbine sitting behind it. How much output you lose depends heavily on how far apart turbines are spaced, measured in rotor diameters (D). This calculator takes your turbine spacing in rotor diameters and your rotor diameter, then reports the estimated wake loss and the actual spacing distance in meters using a simplified spacing rule of thumb. Pair the result with our Wind Farm Capacity Factor Calculator to see how wake losses drag down whole-farm output, and our Wind Turbine Output Calculator to start from a single turbine's free-stream power.
Common commercial wind farm spacing in the prevailing wind direction ranges 5-9D; crosswind spacing is often tighter at 3-5D.
Modern utility-scale onshore turbines commonly use 100-170m rotor diameters.
63 ÷ turbine spacing (rotor diameters, D)
turbine spacing (rotor diameters, D) × rotor diameter (m)
This is a simplified planning-level approximation. Real wake loss depends on the local wind rose (direction frequency), terrain, turbulence intensity, and specific turbine model, and is typically calculated using specialized wake modeling software (such as WAsP or WindPRO) for actual project design.
Results update live as you type. For planning and field-check estimates — always verify against applicable standards and equipment ratings.
How we calculate this →Turbine spacing is a direct tradeoff between land use and energy loss: tightly packed turbines at 3-4 rotor diameters can lose 15-20%+ of potential output to wake turbulence from upstream turbines, while widely spaced turbines at 9-12D cut that loss to under 5-7% -- but require far more land per turbine. At a typical 7D spacing (about 910m for a 130m rotor), wake losses land around 9%, a common middle-ground target in commercial wind farm layouts.
How turbine spacing & wake loss is calculated
This calculator estimates the wake loss a wind farm suffers from turbine spacing and converts that spacing into an actual distance, tying two inputs together: the turbine spacing in rotor diameters (D) and the rotor diameter. Two quantities tie the calculation together.
Estimated Wake Loss (%) = 63 ÷ Turbine Spacing (rotor diameters, D). When wind passes through a turbine's rotor, it slows down and becomes more turbulent downstream — a wake. Any turbine positioned in that wake receives less energetic, more turbulent wind than free-stream conditions, producing less power than it would in an unobstructed location. The closer turbines are spaced, the more of that wake the downstream turbine sits in, and the larger the energy loss. The simplified rule of thumb used here — 63 divided by the spacing in rotor diameters — captures this inverse relationship: tighter spacing means larger losses, wider spacing means smaller losses. At the default 7D spacing, that is 63 ÷ 7 = 9.0% estimated wake loss; at 3D it is 63 ÷ 3 = 21.0%, and at 12D it is 63 ÷ 12 = 5.25%.
Actual Spacing Distance (m) = Turbine Spacing (rotor diameters, D) × Rotor Diameter (m). Spacing is conventionally expressed in rotor diameters because the wake length scales with rotor size — a larger rotor throws a longer, wider wake, so the same multiple of diameters represents a proportionally larger physical distance. Multiplying the spacing in rotor diameters by the rotor diameter converts the dimensionless spacing into an actual meter distance on the ground. At the defaults (7D, 130m rotor), that is 7 × 130 = 910 m between turbines in the prevailing wind direction.
Two notes on the model. First, this is a simplified planning-level approximation — real wake loss depends on the local wind rose (direction frequency), terrain, turbulence intensity, and specific turbine model, and is typically calculated using specialized wake modeling software (such as WAsP, WindPRO, or OpenWind) for actual project design. Second, wake loss is strongly directional: turbines directly downwind of another turbine in the prevailing wind direction experience the most loss, which is why wind farms are often laid out with tighter spacing perpendicular to the prevailing wind and wider spacing along it. Data sources: wake loss approximation formula from wind farm layout optimization studies and simplified wake modeling; turbine spacing conventions from utility-scale wind project design standards and industry best practices; wind rose and directional wake effects from wind resource assessment and wind farm performance data; specialized wake modeling software (WAsP, WindPRO, OpenWind) methodologies from wind energy engineering literature; land use and infrastructure cost data from wind farm development case studies. Verification: with defaults (7D spacing, 130m rotor), Estimated Wake Loss = 9.0%, Actual Spacing Distance = 910 m.