kVATools.io | Electrical Design Studio

kVATools.io is a free suite of browser-based programs that simplify commercial and industrial electrical computations. Each tool is respectively compliant with IEEE, IEC, NEC, and NEMA standards and carries technical documentation for all calculations. There are no ads, no trackers, and no email address required. Calculations run locally, and project data can be exported as a JSON file and subsequently imported.
01
Arc Flash Calculator
Calculate arc flash incident energy and boundary distances for low and medium-voltage electrical systems, per IEEE Std 1584-2018.
02
Autotransformer Kit
Size autotransformers and calculate terminal currents and overcurrent protection per IEEE Std C57.12.00-2021, C57.12.01-2020, and NEC Article 450.6.
03
Battery Sizer
Size lead-acid batteries for stationary applications per IEEE Std 485-2020.
04
Battery Sizer, PV
Size lead-acid batteries for stand-alone photovoltaic applications per IEEE Std 1013-2019.
05
Battery Sizer, UPS
Size UPS batteries for constant-load applications per IEEE Std 1184-2022.
06
Breaker Wizard
Select low-voltage breakers based on installation parameters and breaker specifications, per IEEE Std 3004.5-2025.
07
Cable Scout
Size cables based on load characteristics, installation particulars, and power quality for AC systems ≤ 1000 V, per IEC 60364-5-52:2009+AMD1:2024.
08
Conductor Spec
Size conductors for AC systems ≤ 2000 V based on load characteristics, material, temperature, and voltage drop, per NEC Article 310.
09
Conduit Filler
Calculate conduit fill percentage for mixed conductor lists with auto-size, nipple exception, and jam ratio check, per NEC Chapter 9.
10
Electric Bill Calculator
An electricity bill calculator supporting tiered residential and commercial billing with net metering, demand charges, power factor penalties, and demand ratchets.
11
Fuse Finder
Select low-voltage fuses based on installation parameters and fuse performance characteristics, per IEEE Std 3004.3-2020 and NFPA 70-2026 (NEC).
12
Motor Dashboard
Compute the full motor circuit protection chain: conductor size, branch circuit protection, overload protection, disconnect size, and locked rotor verification, per NEC Article 430.
13
Panel Pro
Size electrical distribution panels from building load data — busbar rating, breaker schedule, phase balance, and feeder ampacity per NFPA 70-2026 (NEC).
14
Power Factor Desk
A simplistic reactive power compensation economic dashboard for three-phase installations.
15
PV Project
Size a stand-alone PV array, per IEEE Std 1562-2021. Companion tool to the PV Battery Sizer.
16
Short-Circuit Lab
Symmetrical three-phase short-circuit analyses for rudimentary radial networks per IEC 60909-0:2016.
17
Standby Planner
Size a standby generator based on running load demand, motor starting voltage dip, and step load acceptance, per IEEE Std 446-1995 and NFPA 110.
18
Transformer Bench
Size transformers for calculated demand based on load characteristics, per IEEE Std C57.105-2019 and IEEE Std 1459-2025.
19
Transformer Load Gauge
Approximate the demand on energized transformers based on field measurements, IEEE Std C57.105-2019 and IEEE Std 1459-2025.
20
Voltage Drop Calculator
Calculate voltage drop using either the Impedance (R–X) Method or the NEC (K·I·L/CM) Method.