Ohmly App Store

Electrical calculations, refined

Your electrical toolkit, redesigned.

Ohmly turns circuit math into a fast, focused workflow. Enter any two values, get every result, and move from Ohm’s law to field-ready tools without leaving the app.

Download on the App Store Explore all 26 tools
  • No ads
  • No accounts
  • No tracking
V = I · R REV 2.0
Ohmly on iPhone showing a completed voltage, current, resistance, and power calculation
VOLTAGE 12.0 V
POWER 108 W
26focused tools
4core values: V · I · R · P
0ads or trackers
1connected Apple experience

The core instrument

Enter any two values.
Ohmly handles the rest.

The interactive VIRP wheel makes every relationship visible. Results update as you type, formulas stay in view, and unit changes recalculate instantly.

01
V  I  R  P

Choose what is known

Enter voltage, current, resistance, or power in the units already on the job sheet.

02
I = V / R

See the relationship

The formula wheel highlights the active calculation and keeps the electrical law explicit.

03
12 V  ·  9 A

Save the result

Label calculations, search history, and combine selected work into a clean PDF report.

One precise toolkit

From the bench
to the field.

Focused calculators for circuit design, troubleshooting, component identification, and installation work—organized for quick recall instead of buried in menus.

Core & components

  • Ohm’s law
  • Resistor color code
  • SMD resistor code
  • Series & parallel resistance
  • Voltage divider
  • LED resistor
  • Capacitor code
  • Inductor color code

AC & circuit design

  • Reactance & resonance
  • AC impedance
  • Power factor
  • RC, RL & LC filters
  • Decibels
  • Op-amp gain
  • 555 timer
  • LM317 regulator

Field & power

  • Voltage drop
  • Wire gauge / AWG
  • Three-phase power
  • Motor FLA
  • Conduit fill
  • Short-circuit current
  • Transformer ratio
  • PCB trace width
  • Heat sink
  • Battery life
Ohmly Tools screen showing resistor, voltage, and wire calculators
Tools stay visible, searchable, and ready when the work changes.

Keep the work moving

Your calculations,
where you need them.

History & reports

Save the calculation. Keep the context.

Label and search past work, reopen exact values, then export selected calculations into a professional multi-page PDF.

Apple Watch

A quick VIRP check from the wrist.

Widgets

Recent results at a glance.

Private by design

Your work stays
on your devices.

Ohmly has no accounts, analytics SDKs, advertising, or behavioral tracking. Calculations happen on-device. History remains in local Apple app storage unless you choose to export and share it.

Read the privacy policy

Built for accurate work

Calculate with clarity.

Ohmly brings the tools together without adding noise.

Download on the App Store