How to use Electrical calculator

Steps, videos and tips for the tool.

Calculators for power, cables, motors, electronics (555 timers, coils, transformers, antennas, speaker boxes and LED strips), batteries and solar strings; home tools for power strips, energy use, travel, power stations and bulbs; resistor and SMD codes; reference pages from wire colors to breakers, fuses and batteries; your panel map; and guides for what anyone may do at home, in three screen layouts.

Watch how it works.

Electrical calculator, shown inside a phone casing

Video coming soon

Getting started

Choose an electrical tool

Pick a tool: turn the dial in the Multimeter layout, or tap it on the start page of the list and drawn layouts. Some dial stops hold more than one tool: the first chip under the dial switches between them. Change the layout with ⋮ › Screen layout.

This is a still image. The how-to video has not been recorded yet.

Read the steps

Basics

Step by step.

Get started

  1. Choose an electrical tool

    Pick a tool: turn the dial in the Multimeter layout, or tap it on the start page of the list and drawn layouts. Some dial stops hold more than one tool: the first chip under the dial switches between them. Change the layout with ⋮ › Screen layout.

Measure

  1. Read resistor bands or SMD codes

    For a resistor, pick a band and tap its color, or tap Type a value to see the bands of a value. For an SMD part, type the code printed on it.

  2. Enter values and prefixes

    Tap a value and type it on the keypad: k, m, µ and M add a prefix, and holding Delete clears it. For Ohm’s law, type any two values and the other two are worked out.

  3. Check home equipment and energy use

    The Home tools check a power strip’s load, a device’s energy use, whether a device works abroad, the power station you need, which bulb to buy and an LED strip’s power supply.

  4. Follow an electrical guide

    Guides walk you through what anyone may do, such as a tripped breaker, testing an RCD or changing a bulb. Each one stops where an electrician takes over. Open them from Guides on the start page, or from the book on the Multimeter.

Save

  1. Keep a map of the electrical panel

    Panel map keeps a photo of your panel and what each switch feeds.

Calibrate

  1. Consult the electrical references

    For wire colors, plugs, IP ratings, pinouts, breakers and fuses, RCDs, batteries, chargers and label symbols, open the book in the Multimeter’s top bar, or the Reference group on the start page. Pick your country where a page asks.

Guided tour

Try these steps in the app. All tour instructions stay readable here.

  1. Choose an electrical tool

    Pick a tool: turn the dial in the Multimeter layout, or tap it on the start page of the list and drawn layouts. Some dial stops hold more than one tool: the first chip under the dial switches between them. Change the layout with ⋮ › Screen layout.

  2. Enter values and prefixes

    Tap a value and type it on the keypad: k, m, µ and M add a prefix, and holding Delete clears it. For Ohm’s law, type any two values and the other two are worked out.

  3. Read resistor bands or SMD codes

    For a resistor, pick a band and tap its color, or tap Type a value to see the bands of a value. For an SMD part, type the code printed on it.

  4. Consult the electrical references

    For wire colors, plugs, IP ratings, pinouts, breakers and fuses, RCDs, batteries, chargers and label symbols, open the book in the Multimeter’s top bar, or the Reference group on the start page. Pick your country where a page asks.

Get the tool.

Find Electrical calculator in these apps.

Angle MeterToolbox

Tips.

Results come from formulas, not from code tables. Check them against your local wiring rules, and test before you touch a wire.

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