FitterPad: the pipe fitter’s calculator you buy once

Type an offset

Travel: 1′ 2-1/8″14.142″
Run: 10″10.000″
Constant: 1.414csc 45°: travel = offset × 1.414

Or try:

What it works out

Fractions

FitterPad calculator: 5 feet 3 and a half inches plus 2 feet 10 and three quarter inches equals 8 feet 2 and a quarter inches

Feet, inches and sixteenths. Add, subtract, multiply and divide tape measurements and get a tape answer back, with the decimal underneath. Free, for good.

Rounds to 1/8, 1/16 or 1/32″
Shows the decimal with every answer
Multiplies by plain numbers, like × 2-1/2

Offsets at any angle

A 10 inch simple offset drawn at 45 degrees with offset, run and travel labelled

11¼°, 22½°, 30°, 45°, 60°, 90° or any angle you type. Know the run instead? FitterPad works out the angle.

Presets for the common fittings
Any angle you type, or worked out from the run
Drawn to the true angle with your numbers

Rolling offsets

A rolling offset: rise 2 feet, roll 1 foot 1 inch, true offset 2 feet 3 and 5/16 inches, with an end view

Rise and roll give the true offset, then travel and setback. An end view shows how the two make the one.

Rise and roll to true offset
Travel and setback, by angle or by setback
An end view of the roll

Cut lengths

ASME B16.9 take-outs for 6 inch pipe: 90 long radius 9 inches, 45 long radius 3 and 3/4, 90 short radius 6, straight tee 5 and 5/8

Subtracts B16.9 elbow take-outs and your weld gap, so the number you see is the number you cut. It says which fitting it assumed.

B16.9 take-outs from ½″ to 24″
Long or short radius, set for each end
Weld gap from none to 3/16″

Cut elbows

A 12 inch long-radius elbow cut to 37 degrees: take-out 6 inches, outside mark 1 foot 3 and 3/4, center 11 and 5/8, inside 7 and a half

Cutting a 90 down to 37°? Get the take-out, then the outside, center and inside marks to lay out on the fitting.

A take-out for any angle
Outside, center and inside marks
Long or short radius

Checked,line by line

Running a bead round a pipe joint. From The Welding Operator, 1942.

Source	What we checked	Against	Result
ASME B16.9, 2018	90° and 45° long-radius elbows, ½″ to 24″	Table 6.1-1	40 of 40 match
	Straight tees, ½″ to 24″	Table 6.1-7	20 of 20 match
ASME B16.9, 2003	Elbows, short-radius elbows and tees	Tables 12, 15 and 17	Same values
ASME B36.10M	Pipe outside diameters, ½″ to 24″	Two published charts	20 sizes cross-checked
Trade-calculator manual	Simple, rolling and cut-elbow worked examples	Its printed answers	7 of 7, to the 1/16″
FitterPad	Its own maths tests	Run before every release	46 of 46 pass

Pay once

$14.99 is less than half of one year on the subscription apps, and you only pay it the one time.

FitterPad Pro, for good

Every angle, rolling offsets, take-outs and cut elbows
One payment, no subscription, no account
Stays unlocked with no signal
Family Sharing included
The fraction calculator and 45° offsets stay free.

$14.99US price, once

Get FitterPad

Questions

Does it work without a signal?

Yes. Every calculation runs on your phone, and Pro stays unlocked in a basement, a tunnel or a refinery unit.

Is it really one payment?

Yes. $14.99 once (US price) unlocks everything for good, and Family Sharing covers your household. No subscription, no account, no ads.

Where do the take-outs come from?

ASME B16.9 for elbows and tees, ASME B36.10M for pipe outside diameters. Every answer says which fitting it assumed, and Show work lays out the formula.

What’s free?

The feet-inch-fraction calculator and 45° simple offsets, for as long as you have the app.

Does it do metric?

Not yet. FitterPad works in feet, inches and fractions down to 1/32″.

I got a new phone

Open Settings in FitterPad and tap Restore purchase, signed in with the same Apple Account. Pro comes straight back.

What does it collect?

Nothing. No accounts, no tracking, no analytics. Your history stays on your phone. Read the privacy policy.