WattsCalc

What WattsCalc Does and the Problem It Solves

WattsCalc is a free, offline-capable progressive web app designed to function as a conduit bending calculator for electrical work. It calculates bending marks for offsets, 90-degree stub-ups, kicks, and saddles down to the nearest 1/16 of an inch. The tool helps electricians and contractors determine critical measurements such as shrink, gain, and take-up, ensuring that conduit does not land short of boxes or couplings due to the longer paths created by offsets.

Who WattsCalc Is For

This calculator is built for field electricians, apprentices, and electrical contractors working with electrical metallic tubing (EMT). It is optimized for professionals on the job site who need quick, reliable math on their phones or devices while working directly out in the field or in a gang box, without requiring an account or internet connection.

How It Works in Practice

Users select the desired bend type—such as an offset, 90-degree stub-up, or saddle—and input the EMT trade size (1/2-inch, 3/4-inch, or 1-inch) along with the required height or length, accepting fractional inputs like 6 1/2 inches. For offsets, users choose an angle between 10 and 60 degrees. The interface computes the distance between marks, shrink, and take-up using standard Klein multipliers and shrink constants. It also includes features for metric conversion and a print mode that isolates the result card.

When to Reach for WattsCalc

Professionals reach for WattsCalc when they need immediate, field-ready reference calculations without navigating multiple URLs or logging into an application. Because it works offline as a progressive web app and requires no account setup, it serves as a handy digital cheat sheet right beside the bender. While results are estimates for reference and users must always verify measurements against local electrical code and scrap conduit, the tool provides quick mathematical checks for everyday shop angles like 30 degrees and tight-space alternatives like 45 degrees.