Calcubiter
Simple orbital calculations — single orbit + Hohmann transfer
Orbital Calcs
MODE
Single orbit
Transfer orbit
Central body
Preset
Custom
Earth
Kerbin (KSP)
Mun (KSP)
Mars
μ (GM) [m³/s²]
Gravitational parameter
Body radius [m]
Used if you enter altitudes
Craft
Starting mass m₀ [kg]
Used for propellant estimate
Isp [s]
Rocket equation (assumes vacuum)
Start date/time
For transfer arrival time
Input style
Altitudes (km)
Radii (km from center)
Inputs
Single orbit (circular)
Orbit altitude / radius A (km)
If altitudes: A = altitude. If radii: A = distance from center.
Optional: second point B (km)
If set, shows speed/period at B too (still circular at each)
Compute orbit
Transfer (Hohmann, circular → circular)
From altitude / radius r₁ (km)
To altitude / radius r₂ (km)
Compute transfer
Results
Δv total
—
Prop required
—
Time / Period
—
Arrival / Notes
—
Ready.
Orbit sketch
Not to scale (but it helps sanity-check direction + relative sizes).