Plane Change Delta-V Calculator
Calculate the delta-V cost of an orbital plane change at any point in an orbit. Includes combined plane change and altitude change optimization.
What It Does
The Plane Change Delta-V Calculator computes the delta-V cost of changing an orbit's inclination using ΔV = 2v × sin(Δi/2). Input the orbital velocity at the maneuver point and the inclination change, and the calculator returns the delta-V cost. It also computes the combined plane-change-plus-altitude-change optimization that splits the maneuver across two burns to minimize total delta-V, almost always cheaper than doing each separately.
Key Features
- Single-burn plane change cost at arbitrary orbital velocity
- Combined plane change + altitude change with split-burn optimization
- Comparison against equivalent prograde delta-V to highlight cost
- Support for any orbit (LEO, MEO, GEO, lunar, Mars)
Why It Matters
Plane changes are brutally expensive. A 30-degree inclination change at LEO velocity costs nearly 4 km/s of delta-V, more than going from LEO to GEO. Mission planners who ignore this discover at PDR that their constellation design needs twice the propellant they budgeted. The calculator surfaces the cost early so you can choose a launch site with the right launch azimuth, dogleg into your target plane, or pick a different orbit altogether before the design is locked.
Calculator
Δv = 2·v·sin(Δi/2); combined: Δv = √(v₁² + v₂² − 2v₁v₂cos Δi)
Inputs
Result
What this does not model. Circular orbits and impulsive burns. The combined figure is the single-burn vector difference, which is the right comparison at one node; a real LEO-to-GEO transfer splits the plane change across perigee and apogee and costs less again.
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Included in every plan
The aerospace pack ships 127 calculators, and there are 478 across all 20 industry packs. Plans start at $14.99/month.