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Electrical

⚡ More than 100 FREE online electrical calculators: kVA power, cables, voltage drop, transformers, UPS, motors, and much more — all AI-powered.

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Electric calculators

Electrical (56)

  • Generator Load Bank Test Sizing — Calculate kW & kVAR from Load or Nameplate
  • Optimize Busway Plug-In Spacing: Generate Load Lists & Distances for Electrical Distribution
  • Electrical Duct Bank Calculator: Arrange Multiple Conduits with Spacing & Grouping Constraints
  • Electrical Conduit Expansion Calculator: Instant ΔL for PVC, Steel & Aluminum
  • Conduit Capacity Calculator: Instant Max Conductors by Conduit Type, Size & Wire Gauge
  • Instant Conduit Fill Calculator: EMT/IMC/RMC/PVC/FMC Sizing per NEC Chapter 9
  • Instant Electrical Conductor Resistance Calculator: AWG/kcmil Ohms for Cu & Al
  • Instant Feeder Copper Loss Calculator — Watts & % Loss for Any Load Current
  • Instant Voltage Drop Calculator — 1-Phase & 3-Phase, Cu/Al, AWG/kcmil (Volts & %)
  • Free Calculator: Determine Conductor Size for Continuous vs Noncontinuous Loads (NEC 210.19/215.2)
  • Electrical Wire Size Calculator – NEC Ampacity by Load Current, Insulation & Cu/Al
  • SPD Placement Around ATS: Line-Side vs Load-Side for Emergency Systems — Maximize Protection
  • ATS Continuous Rating Calculator — Size Transfer Switch from Load Current (Optional Gen Check)
  • Calculate Neutral Current for 4-Wire Generators — Fast Unbalanced Load Estimator
  • Quick Generator THD Screening Calculator — Estimate Distortion from Nonlinear Load %
  • Quick Voltage Dip Calculator for Generators: Estimate Step-Load Drops from Alternator Inputs
  • Generator Capacity Margin Calculator: Find Maximum Additional Electrical Load Allowed Instantly
  • Load Shedding Priority Planner & Calculator: Stay Within Your Generator Rating
  • Free Instant Generator kW & kVA Calculator — Size Your Generator from Load kW + Power Factor
  • Accurately Size Your Standby Generator: Load-List Calculator for Running + Starting Watts
  • Quick UPS Crest Factor & Nonlinear Load Screening Calculator – Simplified Inputs, Instant Results
  • Calculate UPS Bypass Breaker & Feeder Sizes: Quick Continuous-Load Rules for Electricians
  • Prevent Generator Failures — UPS Compatibility Calculator for Step Load, Inrush & Harmonics
  • Quick UPS Input & Rectifier Current Calculator — Get Amps from kW, PF & Efficiency
  • Instant UPS Battery String Sizing Calculator: Get Series/Parallel Counts & Target DC Bus Voltage
  • Free UPS Runtime Calculator: Predict Run Time from Load (kW), Battery Voltage, Ah & Efficiency
  • Avoid Overbuying: Exact UPS Size (kVA/kW) for IT/Servers – PF & Headroom Calculator
  • Electrical Panel Schedule Builder: Calculate Circuit Totals, Balance Loads & Avoid Overloads
  • Instant, Accurate Single-Phase 120/240V Service Sizing Calculator for Mixed Loads & Demand
  • Instant 120/208V Wye Feeder Sizing Calculator — Accurate Electrical Service for Mixed Loads
  • Receptacle Load Calculator: General-Purpose vs Dedicated Circuit Totals in Seconds
  • How to Select the Right Breaker & Fuse Size: Standard Ratings & Rounding Rules
  • Instant Ohms ↔ Per-Unit Converter — Two-Way Base kV & MVA Calculator
  • Instant Per-Unit to Ohms & Amps Converter — Convert Generator/Transformer Values to Real Units
  • Instant Capacitor Bank Protective Device Sizing Calculator — kVAR, Inrush & Fault Duty
  • kVAR Capacitor Bank Sizing Calculator – Achieve Target Power Factor (Fixed or Stepped)
  • Arc Flash ‘WhatIf’ Mitigation Calculator — See How Faster Clearing Time & PPE Reduce Risk
  • Calculation-Driven Arc Flash Label Generator – Auto-Fill Key Label Fields for Compliant Electrical Labels
  • Calculate Reduced Arcing Current for Arc Flash – Ensure Protective Device Sensitivity in Minutes
  • Calculate Arc Flash Arcing Current in Seconds: Input Equipment Voltage & Bolted Fault Current
  • Accurate Arc Flash Incident Energy Calculator — IEEE 1584 & NFPA 70E Input-Based Workflow
  • NEC 450.3 Quick Selector: Instantly Pick the Best Transformer Primary Protection
  • Pickup Separation Helper: Quickly Check Protective Device Spacing to Prevent Coordination Errors
  • Electrical Coordination Calculator: Screen Ground-Fault Pickup vs Downstream Breakers
  • Instant Peak Let-Through & I2t Calculator — Current-Limiting Fuse Screening Tool
  • Calculate the Right Electrical Fuse Size from Load Current — Standard Sizes & Rule of Thumb
  • Quick SPD SCCR Calculator: Verify Adequacy Against Available Fault Current
  • Instantly Calculate Ohms by Length for Grounding & Bonding Conductors
  • Instant Soil Resistivity Converter: Convert Ohmmeter Readings to Ω·cm for Grounding Work
  • Calculate Grounding Return Path Impedance to Screen Fault-Clearing Current Risks

Cables, Materials, and Electrical Conversions (11)

  • mm² to AWG Online Converter — Table, Tips, FAQ
  • Short-Circuit Current in Cables Calculator – IEC/IEEE
  • Three-Phase System Cable Sizing Calculator – NEC
  • Inductance and Capacitance in Transmission Lines Calculator – IEEE, IEC
  • Electrical Cable Resistance Conversion Calculator – IEC
  • MCM to mm² Conversion Calculator (IEC/NEMA Standards)
  • mm² to AWG Conversion Calculator – IEC, NEMA
  • AWG to mm² Conversion Calculator – IEC, NEMA
  • Electrical Cable Losses Calculator – IEEE, IEC
  • Conductor Short-Circuit Calculator IEC – Free Tool
  • MCM to mm² Conversion

Conduit and Cable Support Systems (4)

  • Support and Fastening System for Conduits Calculator – NEC, IEC
  • Minimum Bending Radius in Electrical Conduits Calculator – NEC
  • Maximum Conductor Fill in Conduits Calculator – NEC
  • Tray and Ladder Sizing by Cable Capacity Calculator – IEC

Current Calculations (6)

  • Balanced and unbalanced load calculation
  • Three-Phase to Single-Phase Power Conversion Calculator
  • Three-Phase Current (Amps) Calculator: Convert kW, HP or kVA to Amps
  • Three-phase to single-phase power conversion
  • Three-phase current or amperage calculation
  • Single-phase current or amperage calculation

Electric Motors (1)

  • CV to HP Calculator: Convert Metric Horsepower to Imperial HP (& kW)

Electric Motors and Torque Calculations (1)

  • RPM to kW Conversion – Calculator with Formula, Conversion Table & Solved Examples

Electrical Calculators (33)

  • Optimize Busway Plug-In Spacing: Generate Load Lists & Distances for Electrical Distribution
  • Electrical Duct Bank Calculator: Arrange Multiple Conduits with Spacing & Grouping Constraints
  • Electrical Conduit Expansion Calculator: Instant ΔL for PVC, Steel & Aluminum
  • Conduit Capacity Calculator: Instant Max Conductors by Conduit Type, Size & Wire Gauge
  • Instant Conduit Fill Calculator: EMT/IMC/RMC/PVC/FMC Sizing per NEC Chapter 9
  • Instant Electrical Conductor Resistance Calculator: AWG/kcmil Ohms for Cu & Al
  • Instant Feeder Copper Loss Calculator — Watts & % Loss for Any Load Current
  • Instant Voltage Drop Calculator — 1-Phase & 3-Phase, Cu/Al, AWG/kcmil (Volts & %)
  • Free Calculator: Determine Conductor Size for Continuous vs Noncontinuous Loads (NEC 210.19/215.2)
  • Electrical Wire Size Calculator – NEC Ampacity by Load Current, Insulation & Cu/Al
  • Free Instant Conductor R/X Converter — Convert Ohms/1000 ft to Ohms/km with Cable Data
  • Convert Ohms/1000 ft to Ohms/km Instantly – Fast Resistance per Length Calculator
  • Instant Volts RMS-to-Peak Converter (and Peak-to-RMS) — Quick Calculator & Guide
  • Quickly Convert Amps to Milliamps (and Milliamps to Amps): Easy Calculator & Guide
  • Instant Horsepower to Amps Converter — 1-Phase & 3-Phase with Efficiency & Power Factor
  • Instant kVA Demand to Amps Converter — Select Service Voltage (1-Phase & 3-Phase)
  • Instant Current Calculator: Convert kW/kVA to Amps (1-Phase & 3-Phase, with Power Factor)
  • Free Single-Phase Power Calculator — Convert V, A & PF to kW/kVA Instantly
  • Calculate Phase Angle from kW & kVAR — Instant Power Triangle Output
  • Instant Reactive Power Calculator – Get kVAR from kW & Power Factor in Seconds
  • Master kW, kVA, kVAR & Power Factor Converter: Two-Way Power Triangle Explained
  • Free kVAR to kW Calculator | Convert with kVA & Power Factor in Seconds
  • Free kVAR to kW Converter: Calculate kW from kVA & Power Factor in Seconds
  • Instant kW to kVAR Converter: Power Triangle Calculator with Power Factor
  • Convert kVA to kW (with Power Factor) — Free Instant Calculator & Examples
  • Instant kW to kVA Converter with Power Factor — Accurate Results & Simple Steps
  • kW to kVA Converter with Power Factor – Instant, Accurate Conversion Tool
  • Instant Watts to kW Converter (and kW to Watts) — Free Calculator & Quick Guide
  • Free Amps to kW Calculator – Instant DC, 1-Phase & 3-Phase Conversions with Power Factor
  • Watts to Amps Converter: DC, 1- & 3-Phase Calculator with Voltage & Power Factor Options
  • VA to Watts (W) Calculator — Free Conversion with Formulas & Tables
  • Line-to-Line to Line-to-Neutral Voltage Calculator — Formula, Table & 3-Phase Examples
  • kW to Amps Calculator — Convert Kilowatts to Amperes (DC, 1Φ, 3Φ)

Electrical Protection and Panels (27)

  • Find the Right Electrical Service Conductor Size — Service Rating Calculator & Standard Sizes
  • How Many Parallel Service Conductors? Instant Calculator for Number of Sets & Conductor Size
  • US Service Voltage Classes Cheat Sheet: Quickly Map Common Electrical Systems
  • Select the Perfect Voltage System for Your Load: 120/240, 120/208 & 277/480 Made Simple
  • NEC 517 Healthcare Essential Electrical Load Calculator — Instant, Code-Compliant Results
  • Quick NEC Load Calculator for Mobile Home Park Site Distribution — Code-Compliant Results
  • Receptacle Branch Circuit Sizing Calculator — Instantly Compute Load & Continuous-Load Requirements
  • Quick Electric Water Heater Load Calculator: NEC Rules & Nameplate Guide for Multiple Units
  • Avoid Overloads: Clothes Dryer Demand Calculator (NEC 220.54) — Fast, Code-Compliant Sizing
  • Instant NEC 220.53 Calculator: Accurately Compute Fastened-in-Place Appliance Demand
  • NEC 220.52 Small Appliance & Laundry Load Calculator — Instantly Size Circuits & Amps
  • Instant Accurate Commercial Feeder Load by Area Calculator — NEC 220.12 & 220.42
  • Free NEC 220.84 Multifamily Load Calculator — Step-by-Step Feeder/Service Workflow
  • NEC 220.82 Optional Method Calculator: Quickly Determine Dwelling Unit Service Load
  • Interactive Electrical Demand Factor Calculator — Apply Selectable Rules for Precise Load Sizing
  • Electrical Diversity Factor Planner: Accurately Size Multiple Load Groups in Minutes
  • Quick Switchboards & Panels Planner: Calculate Electrical Spare Capacity and Growth Margin
  • Instant, Accurate Main Distribution Panel Bus Rating Calculator — Demand + Growth Margin
  • Quick Electrical Service Disconnect Amp Calculator — Find Your Minimum Rating & Standard Sizes
  • Accurate Neutral Load Calculator for Feeders & Panels (Mixed 120/240V) — Prevent Overloads
  • Avoid Neutral Overloads: 3-Phase Panel Load Calculator for 120V Unbalance
  • Electrical Branch-Circuit Load Summary Calculator: Auto Totals for Panel Schedules
  • Instant Electrical Panel Schedule Load Summary Calculator — Convert Circuit List to kW/kVA & Amps
  • Line Impedance Calculator
  • Fuse Selection for Electrical Circuits Calculator – NEC
  • Overload Relay Calculator – IEC

Frequency and Power Factor (1)

  • Three-Phase Capacitor Bank Calculator – IEEE

Generators and Power Plants (9)

  • SPD Placement Around ATS: Line-Side vs Load-Side for Emergency Systems — Maximize Protection
  • ATS Continuous Rating Calculator — Size Transfer Switch from Load Current (Optional Gen Check)
  • Calculate Neutral Current for 4-Wire Generators — Fast Unbalanced Load Estimator
  • Quick Generator THD Screening Calculator — Estimate Distortion from Nonlinear Load %
  • Quick Voltage Dip Calculator for Generators: Estimate Step-Load Drops from Alternator Inputs
  • Generator Capacity Margin Calculator: Find Maximum Additional Electrical Load Allowed Instantly
  • Load Shedding Priority Planner & Calculator: Stay Within Your Generator Rating
  • Free Instant Generator kW & kVA Calculator — Size Your Generator from Load kW + Power Factor
  • Accurately Size Your Standby Generator: Load-List Calculator for Running + Starting Watts

Grounding and Surge Protection (21)

  • Instantly Calculate Ohms by Length for Grounding & Bonding Conductors
  • Instant Soil Resistivity Converter: Convert Ohmmeter Readings to Ω·cm for Grounding Work
  • Calculate Grounding Return Path Impedance to Screen Fault-Clearing Current Risks
  • Quick Grounding Conductor Sizing Calculator for Service Raceways — Based on Largest Ungrounded
  • Instant NEC 250.104 Electrical Bonding Calculator — Metal Water Piping & Structural Steel
  • Quick NEC 250.53(A)(2) Checker: Do You Need a Second Ground Rod or Meet the 25Ω Rule?
  • Quick NEC 250.30/250.34 Calculator for Grounding & Bonding of Separately Derived Generator Systems
  • Essential Grounding & Bonding Checklist for Separately Derived Systems (Transformers & Generators)
  • NEC 250.24: Quick Grounding & Bonding Checklist + Calculator for Service Disconnects
  • NEC 250.102(D) Load-Side Bonding Jumper Size Calculator — Instant, Code-Compliant Results
  • Supply-Side Bonding Jumper Size Calculator — NEC 250.102(C) (Instant & Accurate)
  • Quick NEC 250.64(E) Calculator: Size Grounding Electrode Conductor for Parallel Service Conductors
  • Instant Electrical GEC Size Calculator for Service & SDS — Quick, Accurate Grounding Results
  • Quick EGC Sizing Calculator for Parallel Conductors in Multiple Raceways — NEC 250.122(F)
  • Electrical System Insulation Level Calculator – IEC, IEEE
  • Lightning Protection Radius (Rolling Sphere Method) Calculator – IEC 62305
  • Lightning Protection Level Calculator – NFPA 780, IEC 62305
  • Lightning Arrester and Surge Protection Selection Calculator – NFPA 780, IEC 62305
  • Step and Touch Voltage Calculator for Personal Safety – IEEE 80, IEC
  • Calculation of lightning protection level according to NFPA 780

Lighting Calculations (2)

  • CCT Calculator – Correlated Color Temperature with Formula, Table & Examples
  • Luminous Efficacy of Light Sources Calculator

Power and Electrical Energy (6)

  • Generator Load Bank Test Sizing — Calculate kW & kVAR from Load or Nameplate
  • Electrical Panel Schedule Builder: Calculate Circuit Totals, Balance Loads & Avoid Overloads
  • Instant, Accurate Single-Phase 120/240V Service Sizing Calculator for Mixed Loads & Demand
  • Instant 120/208V Wye Feeder Sizing Calculator — Accurate Electrical Service for Mixed Loads
  • Receptacle Load Calculator: General-Purpose vs Dedicated Circuit Totals in Seconds
  • How to Select the Right Breaker & Fuse Size: Standard Ratings & Rounding Rules

Power Parameters and Quality (6)

  • Instant Ohms ↔ Per-Unit Converter — Two-Way Base kV & MVA Calculator
  • Instant Per-Unit to Ohms & Amps Converter — Convert Generator/Transformer Values to Real Units
  • Instant Capacitor Bank Protective Device Sizing Calculator — kVAR, Inrush & Fault Duty
  • kVAR Capacitor Bank Sizing Calculator – Achieve Target Power Factor (Fixed or Stepped)
  • SAIDI SAIFI CAIDI Calculator – Reliability Index Tool
  • Calculation of total harmonic distortion (THD) in electrical systems

Power Supply Systems and UPS (10)

  • Quick UPS Crest Factor & Nonlinear Load Screening Calculator – Simplified Inputs, Instant Results
  • Calculate UPS Bypass Breaker & Feeder Sizes: Quick Continuous-Load Rules for Electricians
  • Prevent Generator Failures — UPS Compatibility Calculator for Step Load, Inrush & Harmonics
  • Quick UPS Input & Rectifier Current Calculator — Get Amps from kW, PF & Efficiency
  • Instant UPS Battery String Sizing Calculator: Get Series/Parallel Counts & Target DC Bus Voltage
  • Free UPS Runtime Calculator: Predict Run Time from Load (kW), Battery Voltage, Ah & Efficiency
  • Avoid Overbuying: Exact UPS Size (kVA/kW) for IT/Servers – PF & Headroom Calculator
  • UPS Capacity in kVA and kW Calculator – IEC, IEEE
  • Battery Charging Calculator – IEC, IEEE
  • UPS Sizing Based on Electrical Load Calculator – IEC

Short-Circuit Calculation and Electrical Protections (14)

  • Arc Flash ‘WhatIf’ Mitigation Calculator — See How Faster Clearing Time & PPE Reduce Risk
  • Calculation-Driven Arc Flash Label Generator – Auto-Fill Key Label Fields for Compliant Electrical Labels
  • Calculate Reduced Arcing Current for Arc Flash – Ensure Protective Device Sensitivity in Minutes
  • Calculate Arc Flash Arcing Current in Seconds: Input Equipment Voltage & Bolted Fault Current
  • Accurate Arc Flash Incident Energy Calculator — IEEE 1584 & NFPA 70E Input-Based Workflow
  • NEC 450.3 Quick Selector: Instantly Pick the Best Transformer Primary Protection
  • Pickup Separation Helper: Quickly Check Protective Device Spacing to Prevent Coordination Errors
  • Electrical Coordination Calculator: Screen Ground-Fault Pickup vs Downstream Breakers
  • Instant Peak Let-Through & I2t Calculator — Current-Limiting Fuse Screening Tool
  • Calculate the Right Electrical Fuse Size from Load Current — Standard Sizes & Rule of Thumb
  • Quick SPD SCCR Calculator: Verify Adequacy Against Available Fault Current
  • Transformer Overcurrent and Overload Protection Calculator – NEC
  • Calculation of Thermal Dissipation in Electrical Panels

Solar, Wind, and Hybrid Systems Calculations (1)

  • Total Area Required for Solar Panel Installation Calculator

Transformer Calculations (24)

  • Can These Transformers Run in Parallel? Compatibility Calculator for kVA Ratio, %Z & Phase Shift
  • Parallel Transformer Load Share Calculator — Solve Impedance Mismatch Fast
  • Instant K-Factor Calculator for Electrical Systems: Compute from Harmonic Currents & Load Level
  • Quick Transformer Temperature Rise Screening Calculator: Estimate Risk from Load Profile
  • Instant Transformer Loss & Heat Output Calculator — See Watts of Losses at Load
  • Fast Transformer Efficiency Calculator: Compute Efficiency from No-Load & Load Losses at Any Load %
  • Buck-Boost Transformer Primary OCPD Screening Calculator: Fast, Accurate Sizing Recommendations
  • Electrical Transformer Primary Protection Fuse Sizing Calculator — NEC 450.3 Options
  • Instant Transformer Primary Fuse Size Calculator — NEC 450 Protection Options
  • Transformer Secondary Fault Current Calculator: Instant kVA, Voltage & %Z Results
  • Instant Transformer % Impedance & Voltage Regulation Calculator: See How Load % & PF Change Output
  • Transformer Impedance Converter: Percent ↔ Ohms Calculator (Two-Way, Instant Results)
  • Easy Reduced-Voltage Autotransformer Starter kVA Sizing Calculator — Instant Motor Starter Screening
  • Calculate Autotransformer kVA for Voltage Change Applications — Instant, Accurate Results
  • Instant Transformer Voltage-to-Turns Ratio Converter – Calculate Turns or Voltage Fast
  • Instant Transformer kVA to Full-Load Amps Calculator (1-Phase & 3-Phase)
  • Instant Transformer Full-Load Current Calculator — kVA & Voltage (1-Phase & 3-Phase)
  • Transformer Losses (Iron and Copper) Calculator – IEC, IEEE
  • Primary & Secondary Protection Sizing Calculator — NEC 450.3(B) with Formulas & Examples
  • Transformer Impedance Percentage Calculator – IEEE, IEC
  • Transformer Sizing Based on Load Calculator – NEC, IEEE
  • Calculation of primary and secondary current in a transformer
  • Magnetizing current calculation in transformers
  • Calculation of transformer losses (iron and copper)

Voltage Drop (3)

  • Free Voltage Drop Limits Calculator — NEC & IEC (EU/USA)
  • Voltage Drop by Cable Distance and Cross-Section Calculator
  • Voltage Drop Calculator for Overhead Lines (IEC)

kVA to HP Calculator — Convert Kilovolt-Amperes to Horsepower

Quick formulas: HP = (kVA × PF × η) ÷ 0.746 · kVA = (HP × 0.746) ÷ (PF × η) · 1 HP = 746 W · Default: PF = 0.8, η = 0.90 kVA to HP Calculator Value: Direction: kVA → HPHP → kVA Power factor (PF): 0.700.750.800.850.900.951.00Other Efficiency (η): 0.800.850.900.920.951.00 (ideal)Other Custom … Read more

Categories Electrical Tags Efficiency, hp, kva, p.f

HP to kVA Conversion – Calculator, Formula, Tables & Solved Examples

Quick formulas: kVA = (HP × 0.746) ÷ (PF × η) — works for both single-phase and three-phase systems. Reverse: HP = (kVA × PF × η) ÷ 0.746 HP ⇄ kVA Converter Conversion Mode: HP → kVAkVA → HP Any phase Power (HP): Power Factor (PF): 0.700.750.800.850.900.951.00Other… Efficiency (η): 0.850.880.900.920.950.98Other… Convert 📋 Copy ↺ … Read more

Categories Electrical Tags hp, hp to kVA, kva, power factor

kVA to kW Calculator — Convert Kilovolt-Amperes to Kilowatts

Quick formulas: kW = kVA × PF · kVA = kW ÷ PF · Default PF if unknown: 0.8 kVA to kW Calculator Value: Direction: kVA → kWkW → kVA Power factor (PF): 0.600.650.700.750.800.850.900.951.00Other Custom PF (0–1): Convert ⚡ PF kW Watts Copy Reset Formulas used kVA → kW: kW = kVA × PFkW → … Read more

Categories Electrical Tags kva, kw, p.f
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