Engineering & Electronics
207 tools · page 3 of 4
- Motor Slip Calculator Calculates the slip percentage and slip speed of an induction motor from synchronous and rotor speeds.
- Steel Beam Selection Calculator Find the required section modulus for a simply supported steel beam under a uniform load, using M=w·L²/8 and an allowable bending stress.
- Antenna Beamwidth Estimate Calculator Estimates the half-power beamwidth of a symmetric-beam antenna from its gain using HPBW ≈ √(41253 / G_linear).
- Bessel Filter Group Delay Calculator Estimates the approximately maximally-flat group delay at DC of a Bessel low-pass filter from its cutoff frequency.
- RMS Voltage Calculator Calculate the RMS and peak-to-peak voltage of a sine wave from its peak voltage.
- Magnetic Field of a Straight Wire Calculator Computes the magnetic flux density around a long straight current-carrying wire in tesla, microtesla and gauss.
- Pile Load Capacity Calculator Estimates the ultimate and allowable bearing capacity of a pile from end bearing and skin friction.
- Ryznar Stability Index Calculator Computes the Ryznar Stability Index (RSI = 2·pHs − pH) to predict whether water tends to scale or corrode based on saturation pH and measured pH.
- Rebar Lap Length Calculator Calculate the lap (splice) length of reinforcing bars from the bar diameter and a lap factor (40× by default for tension splices).
- Wien Bridge Oscillator Frequency Calculator Calculates the oscillation frequency of a Wien bridge oscillator from its resistor (kΩ) and capacitor (nF) values using f = 1/(2πRC).
- Pi Filter Attenuation Calculator Estimates the ripple attenuation in decibels of an LC low-pass (pi) filter from its cutoff frequency using a two-pole 40 dB/decade rolloff.
- Two-Pulley Belt Length Calculator Calculate the required belt length for a two-pulley drive from center distance and the large and small pulley diameters.
- Buck Converter Duty Cycle Calculator Calculate the ideal duty cycle of a buck (step-down) converter: D = Vout/Vin.
- Euler Buckling Load Calculator Calculate the Euler critical buckling load of a slender column from its Young's modulus, moment of inertia, length, and end-fixity factor: Pcr = π²·E·I / (K·L)².
- Generator Size Calculator Calculate the generator wattage you need from your running load plus the largest starting surge.
- Rectangle Moment of Inertia Calculator Computes the second moment of area (moment of inertia) and section moduli of a rectangular cross-section.
- True Airspeed Calculator Estimate true airspeed from indicated airspeed and pressure altitude using the 2% per 1,000 ft rule of thumb.
- Pull-Up Resistor Calculator Computes the minimum pull-up resistor value from supply voltage, output low voltage and sink current, plus its power dissipation.
- RC Filter Cutoff Calculator Calculate the cutoff frequency of an RC low-pass or high-pass filter.
- Top of Descent Calculator Calculates the top-of-descent distance using the 3:1 rule (NM = altitude to lose / 1000 × ratio) plus the rate of descent at a given groundspeed.
- Voltage Drop Calculator Work out the voltage drop along a copper or aluminum cable from its length, current, cross-sectional area, and supply voltage. The calculator returns the voltage drop in volts, the drop as a percentage of the supply, and the voltage that actually reaches the load, so you can check whether your conductor size is adequate.
- Halpin-Tsai Composite Modulus Calculator Estimates the transverse elastic modulus of a fiber-reinforced composite using the Halpin-Tsai equation.
- Hydraulic Radius Calculator Calculate the hydraulic radius from the cross-sectional flow area and the wetted perimeter.
- Maximum Power Transfer Calculator Applies the maximum power transfer theorem to find the load resistance and maximum power deliverable from a source.
- RC Low-Pass Filter Gain Calculator Computes the magnitude of the voltage gain (and its value in decibels) of a first-order RC low-pass filter at a specified signal frequency.
- Wire Length from Resistance Calculator Finds the length of wire needed to reach a target resistance for a given diameter and conductor material.
- Crosswind Component Calculator Calculate the crosswind and head/tailwind components on a runway from wind speed and direction.
- Ground Speed With Wind Calculator Estimates ground speed from true airspeed, aircraft heading and the wind direction and speed, plus the headwind and crosswind components.
- MOSFET Switching Loss Calculator Estimate the switching power loss in a MOSFET: P = 0.5·Vds·Id·(t_on + t_off)·fsw.
- Setting Out Offset Calculator Computes the coordinates of a point offset perpendicular to a centerline of known position and bearing, for surveying set-out.
- Aliasing Frequency Calculator Calculate the aliased (folded) frequency that appears when a signal is sampled below the Nyquist rate, plus the Nyquist frequency. Essential for understanding digital sampling and avoiding aliasing artifacts.
- Appliance Energy Cost Calculator Calculate the running cost of an appliance from its wattage, hours of use and your kWh rate.
- Battery Pack Configuration Calculator Computes the series (S) and parallel (P) cell configuration, total cell count and pack energy from your target pack voltage and capacity.
- Block Coefficient Calculator Calculate a ship’s block coefficient (Cb) — the ratio of the displaced volume to the bounding box of length, beam and draft — a measure of hull fullness.
- Bolt Bearing Pressure Calculator Calculates the bearing pressure at a bolt hole as force divided by the projected area (bolt diameter × plate thickness).
- Brinell Hardness Number Calculator Calculates the Brinell Hardness Number (HB) from the applied load, indenter ball diameter, and resulting indentation diameter.
- Cable Size Voltage Drop Calculator Calculates the voltage drop along a copper cable run and the minimum conductor size for your drop limit.
- Carothers Equation Calculator Uses the Carothers equation to compute the number-average degree of polymerization Xn from the fractional monomer conversion p in step-growth polymerization.
- Concrete Column Volume Calculator Calculate the concrete volume needed for a round column from its radius and height.
- Controlled Impedance Stackup Calculator Estimates the characteristic impedance, effective dielectric constant and propagation delay of a microstrip trace in a PCB stackup (IPC-2141).
- CT Disinfection Value Calculator Calculate the CT disinfection value for water treatment from disinfectant concentration and contact time.
- Differential Leveling Calculator Computes a new ground elevation from a benchmark using a backsight and foresight reading, plus the height of instrument and rise/fall.
- Drone Coverage Calculator Calculate the ground footprint a drone camera captures in a single photo from the flight altitude and the camera’s horizontal and vertical fields of view. Plan survey altitude and image overlap.
- Earth Rod Resistance Calculator Uses the Dwight formula to work out the resistance of a driven earth rod from soil resistivity, rod length and diameter.
- Electrical Load Calculator Calculates total electrical load and service current for a dwelling from floor area, lighting load and appliances.
- EV Cost Per Mile Calculator Calculate the electricity cost per mile and per 100 miles for an electric vehicle based on energy consumption (kWh per 100 miles) and your electricity price per kWh.
- Factor of Safety Calculator Calculate the factor of safety as material strength divided by applied working stress, plus the margin of safety and a safe/unsafe verdict.
- Free Space Path Loss Calculator Calculate free-space path loss in decibels: 20·log₁₀(d) + 20·log₁₀(f) + 32.44, with distance in km and frequency in MHz. A core figure for RF link budgets and wireless range planning.
- Fresnel Zone Radius Calculator Calculates the first Fresnel zone radius at the link midpoint and the 60% clearance needed for a wireless path.
- Friis Transmission Calculator Calculate the received power of a radio link with the Friis equation from transmit power, antenna gains, frequency and distance.
- Fuel Burn Calculator Calculate total fuel required for a flight or leg from your burn rate, flight time, and a reserve fuel margin.
- Generator Sizing Calculator Find the generator kW you need from your running watts and the largest starting surge.
- Glide Ratio Calculator Calculate glide ratio from horizontal distance and altitude lost — the lift-to-drag performance of an aircraft or glider.
- Helical Antenna Calculator Computes the gain, one-wavelength circumference, and axial length of an axial-mode helical antenna from operating frequency and number of turns (spacing fixed at 0.25λ).
- Horizon Dip Calculator Calculates the dip of the visible sea horizon (in arcminutes and degrees) and the distance to the horizon from the observer's height above sea level.
- Lead Screw Torque Calculator Calculate the torque required to drive an axial load using a lead screw, based on the load, screw lead, and mechanical efficiency.
- LMTD Heat Exchanger Calculator Computes the log mean temperature difference (LMTD) for a heat exchanger from the hot and cold stream inlet and outlet temperatures.
- Longitudinal Stress Calculator Computes the longitudinal (axial) stress in a thin-walled pressure cylinder as σ = P·d/(4·t), plus the hoop stress for comparison.
- Microstrip Impedance Calculator Estimate the characteristic impedance of a PCB microstrip trace using the IPC-2141 / Wheeler approximation.
- Moving Average Filter Calculator Apply a simple moving average filter to a list of numbers over a chosen window size to smooth out noise, returning the smoothed series. Common in signal processing and time-series analysis.