FitUp questions and answers

FitUp is a pipe offset calculator for iPhone. You type an offset (or a rise and a roll for a rolling offset), pick the fitting angle, the pipe size, and the fitting, and it gives you the travel, the run, the take-out for each fitting, the root gap for each joint, and the cut length to the nearest 1/16 inch. It draws the offset with every side labeled and shows the formula with exact decimals, so you can check the arithmetic. Each answer can be saved to a job's cut list.

Yes, the download is free and the free tier does real work every month: unlimited simple offsets at 45 degrees with the full answer, ten rolling offsets at 45 degrees a month, the take-out chart for 1/2, 3/4, and 1 inch, one saved job with any number of cuts, and answers in fractions to the nearest 1/16 or in decimal inches. There is no account and there are no ads. Pro is optional; see pricing.

Pro is $4.99 a month, or $29.99 a year. The yearly plan starts with a 7-day free trial; nothing is charged until the trial ends, and if you cancel at least 24 hours before the end you pay nothing. The monthly plan has no trial. Both renew automatically at the same price until you cancel. Prices are in US dollars, and the App Store shows your local price before you confirm.

Subscriptions are handled by Apple. On your iPhone open Settings, tap your name, tap Subscriptions, tap FitUp, and tap Cancel Subscription. Do it at least 24 hours before the period or the trial ends to avoid the next charge. You keep Pro until the end of the time you paid for, and the free tier keeps working after that. Deleting the app does not cancel the subscription.

Yes. The cut length is the travel minus the take-out of both fittings minus the root gap at both butt welds, and each of those is listed under the cut so you can see what came off. The take-out comes from the pipe size and fitting you pick. The gap is 1/8 inch per joint by default for welded trades and zero for plumbing; Pro lets you set it from 0 to 3/16 inch. Pick no fittings for a center-to-center answer.

Offsets at 45 degrees are free and unlimited. Pro adds 11.25, 22.5, 30, and 60 degrees, plus any angle you type from 1 to 89. On the free tier the diagram still draws for those angles, and the travel, run, and cut length are blurred until you subscribe. At any angle other than 45, FitUp takes the take-out from a 90 cut down to that angle, using the 90's center-to-end times the tangent of half the angle.

The chart ships the commonly published center-to-end dimensions for butt-weld elbows: 90 long radius (1.5 times the pipe size), 90 short radius (1 times the size, from 1 inch up), and 45 long radius, for 1/2 to 12 inch pipe. They are labeled "Default values. Check your fittings." because makers differ. With Pro you can edit any value and type in threaded and socket-weld take-outs, and your values are used in every offset after that. The full chart is printed in the take-out chart guide.

Yes. Every calculation runs on the iPhone, so it works in a basement mechanical room, a tunnel, or a pipe rack with no bars. A connection is only needed to buy, restore, or check a subscription. Your jobs and settings never need the internet.

There is no account and no login. Jobs, cut lists, take-out edits, and settings are stored on your iPhone and included in your normal iCloud or computer backup. They are not sent to the developer or to anyone else. The only data that leaves the phone is about subscriptions, which Apple and RevenueCat handle as the privacy policy describes.

Fractional inches to the nearest 1/16 and decimal inches to three places are free. Pro adds rounding to the nearest 1/32 and millimeters. Whatever the display, the formula line under each result shows the exact decimal, and the cut is rounded once, at the end, so rounding errors do not stack up.

No. FitUp is an iPhone app and needs iOS 17 or later. The free pipe offset calculator and rolling offset calculator on this site run in any phone's browser and use the same math as the app.

No. FitUp is a layout calculator. It does arithmetic on the numbers you type and the take-outs in its chart. It does not check codes, pressure ratings, slope, supports, or welding procedures, and it makes no claim that a result meets any of them. Verify measurements and fitting dimensions before cutting.

No. Conduit offsets are bent in one piece, so electricians work with bender marks and shrink. FitUp is for pipe joined with fittings, where the length you cut has to allow for each fitting's take-out and each weld's gap. The travel multipliers are the same numbers, but the cut length is not.

Yes, with Pro. A job's cut list can be sent as text or as an image through the iPhone share sheet, to Messages, email, or anywhere else you pick. On the free tier you can save one job with any number of cuts and read its cut list in the app.

Nothing is deleted. Every job stays on the phone and can be renamed or deleted. The first job's cut list stays readable on the free tier; the cut lists of later jobs, made while you had Pro, show again when Pro is back. Simple offsets at 45 degrees and the monthly free rolling offsets keep working.

Yes. The calculators on this site are a direct port of the app's formulas and take-out defaults, and they are tested against the same constants: 1.414 and 1.000 at 45 degrees, 2.000 and 1.732 at 30, 1.155 and 0.577 at 60, 2.613 and 2.414 at 22.5, and 5.126 and 5.027 at 11.25. The app adds the saved jobs and cut lists, your own take-outs, and working with no signal.