Calculators
275 engineering calculators across 12 disciplines. Included with the All-Access pass.
Electrical & Power Systems
52 calculatorsPanel Schedule Builder
Build and balance panel schedules with automatic phase assignment.
Commercial Load Calculation
NEC 220 Part III demand load analysis by occupancy type.
Demand Load Summary
Aggregate multiple panels and feeders into a main service calculation.
HVAC, Mechanical & Plumbing
38 calculatorsCooling Load Estimator
Estimate peak cooling load (BTU/hr & tons) by occupancy type, area, and climate zone.
Duct Sizing Calculator
Size rectangular and round ducts by equal friction method. Outputs velocity and friction rate.
HVAC Heating Load
Manual J simplified heating load calculation for commercial and residential spaces.
Hydronic Pipe Sizing
Size hydronic heating and chilled water piping systems by flow rate and velocity.
Fixture Unit Load (Hunter's)
Calculate total fixture units and recommended pipe size per IPC/UPC Hunter's method.
Pipe Flow & Sizing
Hazen-Williams equation — GPM to pipe diameter, velocity, and head loss per 100 ft.
Water Heater Sizing
First-hour rating and storage volume sizing for commercial water heaters.
Civil, Structural & Geotechnical
30 calculatorsStormwater Runoff (Rational)
Compute peak runoff Q = CiA per the Rational Method for drainage design.
Concrete Volume Calculator
Compute concrete volume and yardage for footings, slabs, columns, and walls.
Simple Beam Load
Calculate reactions, shear, and bending moment for simply supported beams.
Retaining Wall Check
Sliding and overturning stability check for gravity retaining walls.
Fire Alarm, Suppression & Life Safety
9 calculatorsSprinkler Density / Area
NFPA 13 density/area method — design density, area of operation, and flow demand.
K-Factor Flow Calculator
Calculate sprinkler discharge (GPM) from K-factor and residual pressure. Solve for pressure required.
Physical & Cyber Security
13 calculatorsNetworks, IT & SCADA
34 calculatorsConduit Fill Calculator
NEC Chapter 9 Table 1 — check conduit fill percentage for mixed cable runs.
PoE Power Budget
Calculate total PoE draw, switch budget utilization, and required UPS capacity.
Fiber Strand Count
Calculate required fiber strand count by pathway, redundancy, and protocol.
Automation, Robotics & Controls
15 calculatorsSoftware, AI & DevOps
3 calculatorsBIM, CAD & Digital Design
6 calculatorsChemical, Process & Environmental
20 calculatorsAerospace, Materials, Semiconductor & More
53 calculatorsBusiness & Estimating
2 calculatorsMarkup & Margin
Calculate selling price from cost, or find your true margin from a given price.
Labor Rate / Wrap Rate
Build fully-loaded labor rates with fringe, overhead, G&A, and profit for government service contracts.