Engineering Calculators
Comprehensive calculators for electrical, power, cooling, hydraulic, mechanical, and civil engineering.
Professional Engineering Tools
Our engineering calculators cover six major disciplines: electrical and electronics, power systems, cooling and HVAC, hydraulic systems, mechanical engineering, and civil engineering. Each calculator includes detailed explanations of engineering principles, formulas, practical applications, and worked examples.
Whether you're designing circuits, sizing generators, analyzing cooling loads, calculating pipe flow, selecting bearings, or estimating concrete volumes, these tools help you perform accurate calculations and understand the underlying engineering concepts.
Discipline Coverage
Electrical & Electronics covers fundamental DC and AC analysis (Ohm's Law, voltage divider, RC time constant, impedance), power-distribution sizing (cable, voltage drop, transformer, conduit fill, grounding), and protection coordination (arc flash per IEEE 1584, fault current per IEC 60909). Power Systems handles three-phase calculations, motor starting and efficiency, generator sizing with derating, and power-factor correction. Cooling & HVAC spans psychrometrics, refrigeration cycle, chilled-water flow, ductwork sizing, ventilation rates per ASHRAE 62.1, cooling-tower performance, and boiler/hydronic system sizing. Hydraulic implements Reynolds number, Darcy-Weisbach pressure drop, Hazen-Williams flow, and water-hammer surge analysis. Mechanical covers bearing life (L10), gear ratios, spring design, bolt torque, thermal expansion, pressure-vessel hoop stress (ASME VIII), column buckling (Euler/Johnson), and ASCE 7-22 wind load. Civil includes beam analysis, concrete volume estimation, slope and grade conversion, stormwater Rational Method, and Terzaghi bearing capacity for shallow foundations.
Standards and Source Material
Every calculator implements a specific published standard or canonical formula and cites its source on the calculator page. Common references include the National Electrical Code (NEC) and IEC 60364 for electrical installation; IEEE 1584 for arc flash; IEC 60909 for short-circuit current; ASHRAE 62.1 (ventilation), 90.1 (energy efficiency), and 55 (thermal comfort) for HVAC; ACI 318 for concrete; AISC 360 for structural steel; ASCE 7 for wind, seismic, and snow loads; ASME Section VIII for pressure vessels; and the Cameron Hydraulic Data and Crane Technical Paper No. 410 for fluid mechanics. Where a standard has been revised, the calculator notes the edition implemented (e.g., ASCE 7-22 vs ASCE 7-16) since the differences can affect compliance. None of these calculators replace a sealed engineering design — they speed up the iterations that lead up to one.
Who Uses Trivolt
Practicing professional engineers use trivolt as a fast first-pass sanity check before committing to detailed analysis in software like ETAP, SKM PowerTools, IES Virtual Environment, or Bentley OpenBuildings Designer. Field technicians and commissioning agents pull up calculators on a phone or tablet during site visits — voltage drop on a long feeder, capacity correction on a chiller at altitude, fault current at a panel — without needing to remote into an office workstation. Students use the explanatory sections to build intuition for concepts that textbook problems present in isolation; trivolt's worked examples typically include the unit reduction step, the where-it-comes-from history of the constant, and the failure modes that the calculation is meant to prevent. Educators use the pages as supplementary reading material because the depth of explanation tends to exceed what a course schedule allows.