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.
515 examples
Highway Lane Capacity at a Target v/c Ratio
Sustainable lane volume corresponding to a target volume-to-capacity ratio.
Parking Lot Stall Count from Available Area
Number of parking stalls a paved area can accommodate given an area-per-stall allowance.
Takeoff Ground Roll Distance (Simplified)
Runway distance needed to accelerate an aircraft from rest to takeoff speed.
Culvert Discharge Capacity (Manning Conveyance)
Culvert flow capacity from its hydraulic conveyance factor and the channel slope.
Roadway Cross-Slope Edge Drop
Vertical drop across a traffic lane created by its cross slope.
Sanitary Sewer Pipe Capacity (Manning Conveyance)
Full-flow capacity of a sanitary sewer pipe from its conveyance factor and slope.
Water Treatment Tank Detention Time
Hydraulic detention time of a water treatment tank at a given flow rate.
Chlorine Dosing Rate for Water Disinfection
Mass feed rate of chlorine needed to achieve a target dose in a flowing water stream.
Reservoir Storage Volume from Area and Depth
Approximate storage volume of a reservoir from its surface area and average depth.
Rainfall Intensity from an IDF Power-Law Curve
Design storm rainfall intensity from an intensity-duration-frequency (IDF) power-law curve.
Time of Concentration (Kirpich Method)
Watershed time of concentration from the empirical Kirpich formula.
Land Parcel Area from Coordinates (Shoelace Formula)
Enclosed area of a land parcel from its boundary corner coordinates using the shoelace formula.
Elevation Difference by Trigonometric Leveling
Elevation difference between two survey points from a measured slope angle and instrument/target heights.
Earthwork Volume by the Average End Area Method
Cut or fill volume between two survey cross sections using the average end area method.
Concrete Mix Volume by the Absolute Volume Method
Total batch volume of a concrete mix from the absolute (solid) volumes of its ingredients, adjusted for entrained air.
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.