Space Mission Cost Estimator Calculator

Historical spacecraft cost data shows that doubling a bus's mass doesn't double its cost — larger buses reuse structural margins, avionics, and design work across more mass, so cost grows slower than mass does. Raising mass to the 0.654 power (an exponent less than 1) captures that sublinear relationship: it's a classic cost-estimating-relationship pattern fit to decades of flown missions, not a physical law.

This calculator adds 12 percentage points to the bus and payload cost multiplier for every TRL step below 9, so a TRL 6 prototype carries a 1.36x multiplier while a TRL 3 proof-of-concept jumps to 1.72x. Since that multiplier applies to both bus and payload costs before integration, program management, and reserves are layered on top, a low-TRL choice compounds through nearly the entire cost stack — it's the single input most likely to double your estimate.

The calculator uses a fixed $/kg rate per destination: $2,700/kg for LEO, $8,000/kg for GTO/GEO, $25,000/kg for lunar, and $40,000/kg for interplanetary trajectories. Reaching farther orbits demands far more propellant and a bigger launch vehicle per kilogram of payload delivered, so the same spacecraft mass can cost nearly 15 times more to launch to Mars than to LEO.

Program management is calculated as 10% of development cost (bus, payload, integration, and ground system), and reserves are 15-30% of development cost depending on mission class, mirroring NASA policy that flagship missions carry the highest cost-growth cushion. Both are layered on top of the subtotal precisely because they exist to absorb the unknowns that a parametric estimate like this one, built from mass and mission class alone, can't see — detailed design work routinely uncovers scope the CER never captured.