FitUpPipe offset calculator for iPhone
The cut length for your pipe offset, with the take-outs and gaps already off
FitUp is a pipe offset calculator for pipefitters, welders, steamfitters, and plumbers. Type the offset center to center, pick the angle, the pipe size, and the elbow, and read the cut length to the nearest 1/16 inch. Both take-outs and both root gaps are already subtracted, and the formula is on screen so you can check it.
The problem
Offset math on cardboard, and a cut you hope is right
Offset times 1.414 on the phone calculator. 14.142 written on the side of the fitting box. Two take-outs off that, then two gaps, then 11.142 turned into a mark on a tape that reads sixteenths. Forget one take-out and the piece comes up long. Forget the gaps and the fit-up will not close. A rolling offset adds a square root and a second piece of cardboard, and it is usually the one somebody asks you to check.
FitUp runs the same steps in the same order every time and lists each one under the answer, so the number you mark is the number you meant.
What it does
Four tools: simple offset, rolling offset, take-outs, and the cut list
Simple offset
Offset and angle in. Travel, run, both take-outs, both gaps, and the cut length out, with a labeled diagram and the formula.
FREE 45 degrees, unlimited. PRO 11.25, 22.5, 30, 60, or any angle.
Rolling offset
Rise and roll in. FitUp finds the true offset, then the travel, run, and cut, and draws the box. Setback mode solves the angle from the run you have.
FREE 10 a month at 45. PRO unlimited, any angle, setback.
Take-outs
Center-to-end for 90 LR, 90 SR, and 45 LR butt-weld elbows, 1/2 to 12 inch, used in every offset. Marked as defaults because makers differ.
FREE 1/2, 3/4, 1 inch. PRO every size, editable.
Jobs and cut list
Save each answer to a named job. The cuts stack into a list you read at the saw, with travel, run, angle, and fittings for each.
FREE one job, any number of cuts. PRO a job per site, sharing.
Why it is different
A cut length, not just a travel
Many pipe offset calculators return the travel and the run in decimals and stop there. The take-outs, the gaps, and the conversion to a fraction are left to you, and that is where offsets go wrong. FitUp carries the answer all the way to the mark on the pipe.
- The cut, not the travel. Travel minus the take-out at each end minus the gap at each butt weld, with every allowance listed under the answer.
- A number your tape reads. Fractions rounded once, at the end, to the nearest 1/16 (1/32 with Pro), with the exact decimal in the formula line.
- Your fittings. The take-out comes from the pipe size and elbow you pick. With Pro you can change any value to match the elbows on your cart.
- The math in the open. The offset is drawn and labeled, and the formula line shows the multipliers (1.414 and 1.000 at 45), so a foreman can check it at a glance.
- No bars needed. Every calculation runs on the phone. No account, no ads, and your jobs stay on your iPhone.
How it works
How to get a cut length for a 45 degree offset in three steps
Measure the offset center to center
How far the line moves over, centerline to centerline, in inches and sixteenths. For a rolling offset, measure the rise and the roll instead.
Pick the angle, the pipe size, and the elbow
FitUp pulls the take-out for that size from its chart and the root gap from your trade: 1/8 inch per joint for welded pipe, none for plumbing.
Read the cut and save it
The cut length shows in green, rounded once to the nearest 1/16. Save it to a job and it lands on that job's cut list, ready at the saw.
Free and Pro
What is free, and what Pro costs
Free
$0
Unlimited simple offsets at 45 degrees with the full answer. Ten rolling offsets at 45 a month. The take-out chart for 1/2, 3/4, and 1 inch. One job with any number of cuts.
Pro Yearly
$29.99/year
7 days free, then $29.99 a year, about $2.50 a month.
Pro Monthly
$4.99/month
Billed every month. No trial.
Pro renews automatically at the same price until you cancel. On the yearly plan, $29.99 is charged when the 7-day trial ends unless you cancel at least 24 hours before. Cancel on your iPhone under Settings, your name, Subscriptions. Details on the pricing page and in the Terms of Use (EULA).
Free tools and guides
Pipefitting math, written out
The formulas FitUp uses, explained with worked examples, plus two calculators that run in any browser. Useful on the day you want to check a number by hand.
Pipe offset calculator
Offset, angle, pipe size, and elbow in. Travel, run, and cut length out.
Rolling offset calculator
Rise and roll, an angle or a setback. True offset, travel, run, and cut.
Pipe offset formula
Travel, run, and cut length, with every term defined.
45 degree offsets
Why the multiplier is 1.414, and what rounding it costs.
Rolling offset formula
True offset from rise and roll, then travel and run.
Take-out chart
90 and 45 butt-weld elbows from 1/2 to 12 inch.
Before you download
Questions fitters ask before they download
Does it take off the take-outs and the weld gap?
Yes. The cut length is the travel minus a take-out for each fitting and a root gap for each butt weld, and both are listed under the cut. The gap is 1/8 inch per joint for welded trades and zero for plumbing.
Which angles are free?
45 degree offsets are free with no limit. 11.25, 22.5, 30, 60, and any angle you type are Pro. On the free tier the diagram still draws for those angles and the numbers are blurred.
Will it work in a basement with no signal?
Yes. All the math runs on the iPhone. A connection is only needed to buy or restore a subscription.
Do I have to make an account?
No. There is no account and no login. Jobs and settings stay on your phone and go wherever your iPhone backup goes.
Does it check code?
No. FitUp is a layout calculator. It does the arithmetic and labels its take-outs as defaults to check against your fittings. Verify measurements before cutting.