Eng/Bench Engineering calculators
25 calculators for the engineering math you redo on every project, across RF, aerospace, power, mechanical and fluids. Each one shows its method, flags the mistakes that sink real designs, and copies a clean summary into your calc package.
RF & Signals
5 calculatorsLink/Margin
Link budget with SNR margin and maximum range for satellite, LoRa and point-to-point links.
Pro: ITU-R rain fade, atmospheric absorption, Fresnel clearance, modulation presets, PDF report.Noise/Cascade
Receiver system noise figure from each stage's gain and noise figure, with per-stage contribution.
Pro: sensitivity, system noise temperature, G/T.Dish/Gain
Parabolic dish gain, beamwidth and far-field distance, with feed mismatch from VSWR.
Pro: pointing loss, G/T.Trace/Impedance
Microstrip trace impedance and effective permittivity from width, dielectric height and copper thickness.
Pro: width for a target impedance, delay, λ/4 length, impedance curve.VSWR/Match
Convert between VSWR, return loss, |Γ| and load impedance, with reflected power and mismatch loss.
Pro: VSWR seen through a lossy cable, mismatch uncertainty.Aerospace
3 calculatorsOrbit/Transfer
Circular orbit speed and period, and Hohmann transfer burns between altitudes, for Earth, Moon or Mars.
Pro: slant range, coverage footprint, pass duration.Delta/V
Rocket equation for up to three stages: Δv per stage, total, and payload fraction.
Pro: burn times, thrust-to-weight, mission target check.Nozzle/Thrust
Ideal nozzle thrust, Isp, mass flow and expansion ratio from chamber pressure and propellant.
Pro: sea-level and vacuum performance, thrust across the climb.Power & Electronics
8 calculatorsJunction/Temp
MOSFET losses and junction temperature solved together, with thermal runaway detection.
Pro: paralleled devices, max ambient and required heatsink, runaway sweep.Wire/Drop
Voltage drop and cable loss for DC, single- and three-phase runs, AWG or metric.
Pro: smallest conductor for your target, max run length, drop chart.Battery/Runtime
Runtime with Peukert's law and depth-of-discharge limits for lead-acid and lithium.
Pro: bank sizing for a required runtime, runtime curve.Divider/Pick
Best standard E12/E24/E96 resistor pair for a divider or regulator feedback network.
Pro: tolerance worst case, next best pairs.Trace/Width
Minimum PCB trace width for a current and temperature rise, outer or inner layer, per IPC-2221.
Pro: resistance, voltage drop, power loss, fusing current.Buck/Design
Duty cycle, inductor and output capacitor for a buck converter across its input range.
Pro: input capacitor, RMS currents, DCM boundary, ripple chart.Filter/Cutoff
Cutoff frequency, gain and phase for RC low-pass, high-pass and RLC filters.
Pro: standard parts for a target cutoff, frequency response.LED/Resistor
Series resistor for an LED or LED string, rounded to a standard value, with its power rating.
Pro: supply-tolerance worst case, string layout for many LEDs.Mechanical
5 calculatorsBolt/Preload
Tightening torque for a target preload, metric and inch, by property class and thread condition.
Pro: preload scatter by tool, slip and separation checks.Beam/Deflect
Bending stress, deflection and safety factor for common supports, sections and materials.
Pro: self-weight, deflected shape against your limit.Spring/Rate
Compression spring rate, Wahl-corrected stress and solid-height safety.
Pro: buckling check, natural frequency.Press/Fit
Interference fit contact pressure, holding torque and hub and shaft stresses.
Pro: shrink-fit heating or cooling temperature, torque curve.Shaft/Size
Minimum shaft diameter for power, speed and bending against yield, with the standard size.
Pro: fatigue diameter with stress raisers, angle of twist.Fluids & Thermal
4 calculatorsHead/Loss
Pipe pressure drop from Darcy–Weisbach and Colebrook with fluid properties by temperature.
Pro: fittings and valves, pump power, system curve.Valve/Cv
Required Cv or Kv for a liquid control valve and how much of its capacity it uses.
Pro: valve authority, cavitation and flashing check.Heat/Exchange
Heat duty and outlet temperatures by ε-NTU for counterflow and parallel exchangers.
Pro: fouling, area needed for a target outlet.Insulation/Loss
Heat loss per metre of insulated pipe, surface temperature and saving over bare pipe.
Pro: yearly energy cost, condensation check, thickness curve.One license, every tool
- Core results in every calculator are free
- One purchase unlocks Pro in all 25 calculators
- New calculators added to the suite are included