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Calculators and converters

Quick tools for the job: current and cable cross-section, depth of field and ND density, current-loop scaling, unit conversion. Every calculation comes with its formula, source, and a link to the article.

For electricians

Cable cross-section calculator by power and current (PUE) Ohm's law: current, voltage, resistance calculator Cable voltage drop calculator Grounding calculator: earth electrode resistance (PUE) Leakage current and RCD selection calculator Short-circuit current calculator (line-to-neutral loop)

For I&C and automation

4-20 mA signal scaling calculator Pressure unit converter: bar, MPa, kgf/cm², online Pt100: resistance-to-temperature converter (GOST 6651) Measurement error and accuracy class calculator Control valve Kvs calculator: online IPv4 subnet calculator: mask, range, CIDR Modbus RTU polling time calculator: cycle and traffic PoE calculator: line length and voltage drop

For photographers and videographers

DOF and hyperfocal distance calculator ND filter calculator: how many stops you need Crop factor calculator: equivalent angle, DOF, and noise Exposure calculator: EV, shutter speed, aperture, ISO Diffraction limit: what aperture detail starts dropping at Golden hour calculator: sunset time and azimuth Timelapse calculator: interval, duration, storage