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.