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for Android

Pipefitter Offset Calculator

Most offset calculators give you the travel and stop there. Travel runs centre to centre of two fittings, so you cannot cut it. This one subtracts the fitting take-offs and your weld gap, then gives you the length to mark on the pipe.

Get it on Google Play

Free to use. A one-time $7.99 unlock opens the cut length. No subscription.

Pipefitter Offset Calculator running on a phone

Most offset calculators give you the travel and stop there.

Travel runs centre to centre of two fittings, so you cannot cut it. This one subtracts the fitting take-offs and your weld gap, then gives you the length to mark on the pipe.

Type 151 5/16 the way you would write it on a scrap of cardboard.

Tap a fraction rather than typing a denominator. Everything comes back in inches and sixteenths, or eighths, or thirty-seconds if that is how your shop marks. No decimals to convert in your head.

What it works out

Rolling offsets
With the roll angle, so you know how far to turn the fitting.
Simple offsets
In one plane.
Fixed run
For when the obstruction has already decided your run.
Cut length
With take-offs and weld gap taken off.
Travel, run and true offset
Alongside it, so you can check the work.

On the phone

Pipefitter Offset Calculator screenshot: rolling offset
Rolling offsetThe diagram and the cut length in one frame.
Pipefitter Offset Calculator screenshot: cut length
Cut lengthTake-offs and weld gap already taken off.
Pipefitter Offset Calculator screenshot: fittings and gap
Fittings and gapEdit any figure to match what you are holding.
Pipefitter Offset Calculator screenshot: fractions
FractionsTap the fraction instead of typing a denominator.

Worth knowing

When the run is fixed

Sometimes you do not get to pick the fitting. Give it the run you actually have and it works out the angle that run needs, then names the nearest fitting you can buy and the run that one would take. It will not assume 45 and hand you a piece that does not fit.

The part you can check

Every number comes from trigonometry you can do on paper. The 1.414 you already know for a 45 is 1 divided by sin 45, and that is how the app gets there too. Take-offs come off the fitting radius. Where a size breaks that rule, it uses the published dimension. You can edit any of it — if the fitting in your hand measures different, use yours.

The assumptions stay on screen

Every answer carries the gap it used, in plain words: cut length assumes 1/8" butt weld gap both ends. That line travels with the cut when you send it to a welder.

On a job site

It works with no signal at all. The buttons are sized for a gloved thumb, and the screen stays on while an answer is up.

Pipefitter Offset Calculator

Free to use. A one-time $7.99 unlock opens the cut length. No subscription.

Figures are estimates for layout. Check the fitting and the weld procedure before you cut. · Privacy policy · Questions: support@provision.services