Energy Calc Notebook

Note: the screenshots are from a development build, so the displayed language may differ. The actual app lets you choose from 9 languages (ja/en/ko/zh/es/pt/fr/de/vi).
Energy Calc Notebook is a calculation app for engineers, covering electricity, heat, fluids and material properties. Quickly call up the formulas you use most on site or in design work—just enter the values and get instant answers.
【Included formulas】
■ Electricity
・Ohm's law (V = I × R)
・Electric power (P = V × I)
・Electric energy (W = P × t)
■ Heat
・Sensible heat
・Heat conduction (flat plate / cylindrical wall)
・Heat transfer (convection)
・Evaporation / condensation heat
・Specific enthalpy of wet steam
・Radiative heat transfer
・Overall heat transmission (flat wall / cylindrical wall)
・Heat dissipation from an insulated pipe
■ Fluids
・Volumetric flow rate
・Mass flow rate
・Bernoulli's theorem
■ Property tables (with lookup & interpolation)
・Saturated steam table (by temperature / pressure)
・Psychrometric chart (dew point, wet-bulb temp., absolute humidity, specific enthalpy, etc.)
・Thermal properties of water (density, specific heat, thermal conductivity, viscosity, etc.)
・Thermal properties of gas mixtures
・Thermal properties of pure gases
・Thermal properties of metals
・Thermal properties of fuel gases
・SGP pipe dimension table
【Features】
✔ Just pick the value you need — tap to switch which variable to solve for, and the input fields change automatically
✔ Save frequently used calculations as favorites and show them on the home screen
✔ Every formula comes with a detailed explanation, use cases and practical notes
✔ Property tables auto-calculate interpolated values just by entering temperature / pressure
✔ No internet required — everything works offline
Useful in a wide range of situations: plant design, facility management, energy-saving audits, study and more.