Equations stay visible
Core relationships are shown so you can inspect the method instead of treating the result as a black box.
Engineering tools that show their work
Calculate. Simulate. Understand.
Free engineering calculators, interactive simulators and study materials for practical problem-solving and technical learning. EngineerHub keeps the equations visible, the assumptions explicit and the sources close to the result.
250+engineering resources
11engineering disciplines
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Search the engineering disciplines and content collections below. Individual tools live inside their subject category.
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New // Power Generation & Grid
Power Plant Water Balance Calculator
Close a full water balance for a nuclear, coal, CCGT or CSP plant — cooling makeup, withdrawal, consumption, blowdown, demineralized water, reuse and discharge — with two worked examples.
Engineering disciplines
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Start with the discipline, then move into the calculator, simulator, learning guide or case study you need.
Thermal Engineering & HVAC
Heat transfer, HVAC, steam, cooling and refrigeration tools for sizing equipment, checking performance and understanding thermal systems.
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Power Generation & Grid
Power-plant cycles, grid frequency and transmission tools, plus interactive outage and stability case studies.
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Fluid Mechanics & Piping
Pressure loss, pipe flow, pumps, NPSH, valves and gas-flow calculations with hydraulic-system visualizations.
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Electrical Engineering
Transformers, cables, short-circuit current, motors, power factor, electromagnetics and transmission calculations.
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Civil & Structural Engineering
Beams, columns, wind loads, concrete, rebar, soil and structural-response tools for practical design checks.
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Mechanical Engineering
Shafts, bearings, gears, springs, fasteners, stress, vibration and fracture mechanics.
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Nuclear Engineering & Radiation
Interactive BWR/PWR reactor models, decay heat, shielding, radiation dose, enrichment and protection calculations.
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Environmental & Safety Engineering
Ventilation, oxygen depletion, noise, stormwater, dewatering, emissions and thermal-discharge screening.
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Building Energy & Services
Heat loss, U-values, heat pumps, ventilation, radiators, lighting, hot water and indoor-environment tools.
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Household Engineering Tools
Engineering-based home tools for backup power, solar, ventilation, humidity, appliance loads and water heating.
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General Engineering
Unit conversion, density, gas laws, thermal expansion, optics, waves and cross-disciplinary engineering references.
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Learn, model and investigate
Prefer a simulator, a structured learning path or a real engineering case? Browse the same library by content type.
Interactive systems
Engineering Simulators
Dynamic models for reactors, grids, pumps, thermodynamic cycles and engineering systems. Change inputs and observe system response.
Open collection →Visual physics
Visual Engineering Simulators
Interactive physics for waves, fields, resonance, optics, particle motion and structural response.
Open collection →Learning library
Engineering Study Materials
Structured Learn pages, formula sheets and reference material for building understanding before or alongside calculations.
Open collection →Real events
Engineering Case Studies
Interactive analyses of blackouts, design failures, engineering successes and major projects—focused on causes, numbers and lessons.
Open collection →Materials database
Engineering Materials
Material-property data and Ashby-style comparison tools for metals, polymers, ceramics, composites and semiconductors.
Open collection →Designed for transparent engineering work
More than an answer box
Assumptions are stated
Inputs, simplifications and model limits are kept close to the calculation where they matter.
Systems can be explored
Interactive simulators let you change operating conditions and observe how engineering systems respond.
References are close by
Technical sources and background material are linked where they help you verify or go deeper.
EngineerHub is intended for education, screening and preliminary engineering work. Safety-critical or regulated decisions require independent verification and applicable professional standards.