Check a beam's deflection, the voltage drop on a run, a pump's head and a building's heating and cooling loads, on reviewed spreadsheet models with the equations on the page.
6 calculators
Convert a ppmv reading to a mass emission rate, normalize stack flow to standard dry conditions, correct a concentration to reference oxygen and balance a fuel's combustion air.
6 calculators
Check the voltage drop on a run, size a copper conductor for both drop and ampacity, check conduit fill, and size motor circuits and transformers.
See all 6 Electrical calculators6 calculators
Check a shallow footing's bearing capacity, estimate consolidation settlement and how fast it happens, and work out effective stress with depth.
See all 6 Geotechnical calculators6 calculators
Find moist-air properties, size ducts by equal friction, estimate a building's heating and cooling loads and split the airflow room by room.
See all 6 HVAC & Energy calculators6 calculators
Work out steady heat flow through a layered wall or an insulated pipe, rate or size a heat exchanger from its LMTD, and find how long a body takes to heat up or cool down.
17 calculators
Check panel capacity, size a generator or an EV charger circuit, and plan gutters, French drains, sump pumps and rainwater tanks for a house.
See all 17 Home Projects Engineering calculators6 calculators
Size water and gas lines, check the pressure lost along a pipe run, work out pump head and power, plan for thermal expansion and find out what's in a tank.
See all 6 Plumbing & Piping calculators6 calculators
Turn an MTBF or a Weibull life model into the chance of surviving a mission, work out a repairable system's availability, and combine components in series, parallel or k-out-of-n.
See all 6 Reliability and Maintenance Engineering calculators6 calculators
Scale a pump or fan to a new speed, find an ideal gas compressor's power and discharge temperature, and rate a shaft in torsion, a spur gear mesh or a belt drive.
See all 6 Rotating Equipment & Drives calculators14 calculators
Check a beam's deflection, a steel column's axial capacity and a drawn cross-section's properties, composite sections included.
See all 14 Structural & Civil calculators7 calculators
Run a treatment plant's daily process checks: F/M ratio, sludge age, SVI, clarifier loading, chemical feed and chlorine CT.
See all 7 Water & Wastewater calculators