kVA ToolsBETA — Electrical
Design Studio
kVA Tools is a free suite of browser-based
programs that simplify common commercial and industrial
electrical computations. Each tool is respectively
compliant with IEEE, IEC, NEC, and NEMA standards and is
accompanied by technical documentation for all
calculations. There are no ads, no trackers, and no
email address required. All 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 Battery Sizer (PV).
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.