Systems Engineering Calculators
Free, instant-answer calculators for aerospace mission concepts and defense program control. No signup required. Full spreadsheet export, mission saves, traceability, and 118+ additional calculators are in the industry packs.
Aerospace — mission concept
Orbit, RF, power and imaging trade studies for early mission design.
Link Budget Calculator
RF link analysis for spacecraft comms. EIRP, path loss, G/T, C/N₀, margin — live as you type.
Open tool →Spacecraft Mass Budget
Subsystem mass rollup with reserve margins. Enter per-subsystem dry mass, see total CBE + MEV with 20/10/5% reserves.
Open tool →Delta-V / Rocket Equation
Tsiolkovsky rocket equation solver. Input Isp, wet/dry mass → Δv. Or target Δv → required propellant mass.
Open tool →GSD Calculator
Ground Sample Distance for imaging payloads. Altitude, focal length, and pixel pitch → GSD at nadir and off-nadir.
Open tool →Orbit Propagator (Kepler)
Simple Keplerian orbit propagator. Altitude, inclination, eccentricity → period, ground velocity, eclipse fraction.
Open tool →Hohmann Transfer Calculator
Two-burn transfer between circular orbits. Both burns, total Δv, transfer time, and departure phase angle.
Open tool →Sun-Synchronous Orbit
Required retrograde inclination from altitude via J₂ nodal precession, plus period, revs/day and RAAN for a chosen LTDN.
Open tool →Solar Array Sizing
Array area from daylight/eclipse load, eclipse fraction, cell efficiency and EOL degradation. SMAD power-budget method.
Open tool →Antenna Gain & Beamwidth
Parabolic dish gain in dBi, half-power and first-null beamwidth, and quadratic pointing loss. UHF through Ka band.
Open tool →Defense — program control
Cost, readiness and sustainment numbers for DoD 5000.02 milestone reviews.
Earned Value Management
CPI, SPI and three EAC methods from BAC, PV, EV and AC — plus the TCPI that shows whether the baseline is still credible.
Open tool →TRL & MRL Assessment
Tick demonstrated evidence, get your Technology Readiness Level, the paired MRL, and any skipped level that caps the rating.
Open tool →Operational Availability
Ao, Ai and Aa from MTBF, repair time and logistics delay — and how much of your downtime is waiting rather than fixing.
Open tool →Learning Curve & Unit Cost
Wright's law unit and lot cost projection. Crawford unit formulation, with the cumulative-average distinction spelled out.
Open tool →Want the other 118+ calculators?
Aerospace adds the high-fidelity propagator, constellation optimizer, Lambert solver, cislunar design studio and the SMAD 8-phase workflow with SRR/PDR/CDR gate packages. Defense adds CMMC tracking, threat modeling, DoDAF views and CDRL/SDRL management against DoD 5000.02 milestones.