Tools
Engineering calculators for electrical design — right in your browser.
Circuit Breaker Selector
Free online circuit breaker selector by load type and power. Calculate rating (6A–63A), characteristic (B/C/D) and recommended cable…
📐Cable Sizing Calculator
Calculate minimum cable cross-section based on load current, installation method and conductor material. Compliant with IEC 60364, GOST…
🌡️Cable heating check
Check cable heating per IEC 60364 / PUE: temperature rise by current, ambient conditions and installation. Prevent insulation damage.
💰How much will your electrical cost?
Estimate your electrical project in 30 seconds: how much cable, how many sockets and breakers, how much installation costs. Free, no…
⛓️Grounding system calculation
Calculate earthing system: rod count, soil resistivity, resistance target (≤4 Ω or 10 Ω per PUE / IEC 60364). For houses, plants,…
💡Lighting Calculator
Free online lighting calculator per EN 12464-1, IS 3646, SP 52.13330. Calculate the number of luminaires, total luminous flux and…
⚡Lightning protection design
Design lightning protection: risk class (I-IV), air-termination height, down-conductors, earthing. Automatic calculation for houses and…
⚖️Electrical Load Calculator
Calculate installed and design power, demand factor and load current for residential and commercial buildings. Per IEC 60364 and SP…
🧮Full material list in one click
Cable, conduit, clips, dowels, boxes, breakers, panel, lights — full material list with quantities and prices, ready to order.
🗄️Distribution Panel Builder
Interactive distribution panel layout: DIN rails, circuit breakers, RCDs, terminal blocks. Automatic heat loss and fill ratio calculation.
🔀Selectivity: breakers that work together
Check selectivity of breakers from input to final circuit per IEC 60364. Find coordination failures before installation.
💥Short-Circuit Current Calculator
Calculate short-circuit currents (three-phase, single-phase) for switchgear verification. Per GOST 28249 and IEC 60909.
🔌RCD / RCBO selection for apartments and houses
Select RCD and RCBO ratings and leakage currents (10/30/100 mA) for each group, per IEC 60364. Automatic calculation, simple interface,…
⚡Voltage Drop Calculator
Free online voltage drop calculator for cable lines. Calculation for copper and aluminum conductors, single-phase and three-phase…
🔥Underfloor Heating Calculator
Online underfloor heating calculation: specific power by room type, heating cable and mat length, laying pitch, current, circuit…
🧊Heat Loss Calculator
Calculate heat loss of a house and room: building envelope, windows, floor, ceiling and ventilation. Specific heat loss W/m², heating…
♨️Electric Boiler Calculator
Electric boiler sizing by area and heat loss: current, breaker, RCD, cable section, single-phase or three-phase connection. Per IEC…
☀️Solar Panel Calculator
Solar power plant calculation: panel power by consumption and regional insolation, number of modules, inverter, batteries for off-grid…
🔋UPS Selection Calculator
UPS selection by load power and runtime: volt-amps conversion, battery capacity, line-interactive or online UPS, recommendations for PC,…
🚗EV Charger Calculator
Electric car charging calculation: charge time from a home socket, Wallbox 7.4/11/22 kW and fast stations, current by phase, breaker,…
🏭Generator Sizing Calculator
Generator sizing by load power: starting currents of motors, single-phase or three-phase, fuel consumption and runtime. Backup power…
🔧Watts to amps and amps to watts
Convert power (kW) to current (A) and back: 1 and 3 phase, 12–400 V, with cos φ. Formula I = P/(√3·U·cosφ). Free online.
🔧kVA to kW and kW to kVA
Convert kVA to kW and kW to kVA with cos φ: P = S·cosφ. For generators, transformers and UPS. Free online.
🔧AWG to mm² and mm² to AWG
Convert American Wire Gauge to metric cross-section mm² and back: table from 4/0 to 30 AWG. Free online.
🔧Electricity cost calculator
Calculate appliance or home energy consumption and cost: kWh per day/month/year and cost by tariff. Free online.
🔧Conduit fill calculator
Check conduit fill by the 40% rule: conduit diameter, cable size, quantity. Per IEC 61386 and NEC Chapter 9. Free online.
🔧Transformer size calculator
Select a transformer by load: required kVA, standard rating (1.6–1000 kVA) and secondary current. Free online.
🔧Power factor correction calculator
Calculate the capacitor bank: reactive power kVAr and capacitance µF to raise cos φ. Free online.
🔧Motor full load current
Calculate the full load and starting current of an electric motor: 230/400 V, efficiency, cos φ, breaker selection. Free online.