Example engineering calculations
Worked, unit-aware calculation worksheets across structural, mechanical, electrical and more. Open any example into your own workspace to edit and reuse. New to Calculeaf? Start with your first worksheet or the examples guide.
55 examples found
Generator Peak EMF
Peak EMF of a rotating coil generator.
Force on a Current-Carrying Conductor
Force on a conductor carrying current in a magnetic field.
Solenoid Magnetic Field
Magnetic flux density inside a long solenoid.
Capacitor Charge
Charge stored on a capacitor at a given voltage.
AC Impedance Magnitude
Magnitude of impedance of a series resistance and reactance.
Resistor Power Dissipation (I²R)
Power dissipated in a resistor from the current through it.
Charge from Current
Electric charge transferred by a steady current over time.
Resistance Change with Temperature
Resistance of a conductor at a new temperature via its temperature coefficient.
Wheatstone Bridge Balance
Unknown resistance from a balanced Wheatstone bridge.
Battery Energy Capacity
Energy stored in a battery from its charge capacity and voltage.
Solar Panel Power Output
Electrical power from a solar panel given irradiance, area and efficiency.
Single-Phase Conductor Voltage Drop
Voltage drop along a single-phase circuit from conductor resistance, current, and length.
Short-Circuit Fault Current (Simplified)
Available short-circuit fault current from system voltage and total fault impedance.
Cable Ampacity After Derating
Allowable cable current-carrying capacity after applying temperature and grouping correction factors.
Transformer Per-Unit Impedance Voltage Drop
Approximate transformer voltage drop under load expressed in per-unit impedance terms.
Power Factor Correction Capacitor Sizing
Reactive power (kVAR) a capacitor bank must supply to raise a load’s power factor to a target value.
Motor Locked-Rotor Starting Current
Inrush current an induction motor draws at the instant of starting, before it comes up to speed.
Circuit Breaker Sizing for a Continuous Load
Minimum breaker rating for a continuous load using the standard 125% continuous-load rule.
Single Ground Rod Resistance to Earth
Resistance to earth of a single driven ground rod electrode from soil resistivity and rod dimensions.
Three-Phase Transformer Apparent Power (kVA)
Apparent power rating of a three-phase transformer from line-to-line voltage and line current.
Percentage Voltage Drop Check on a Feeder
Voltage drop expressed as a percentage of nominal voltage for a quick feeder compliance check.
Solar PV Array Panel Count Sizing
Number of solar panels needed to meet a daily energy target given peak sun hours and system efficiency.
Battery Bank Capacity for Backup Power
Battery bank capacity in amp-hours needed to power a backup load for a target duration.
Battery Charge Time from Charger Current
Time needed to recharge a battery from its amp-hour capacity and the charger’s current output.