FitterCalc

The pipe trades calculator that shows its work.

Offsets, rolling offsets, cut lengths, takeouts, cutbacks, elbow cut marks, pipe data, and slope — computed correctly, displayed in feet-inch-fractions, and verified against published handbook values. Every answer can show the exact formula with your numbers in it. If you can check it, you can trust it.

PAY ONCE. OWN IT FOREVER. No subscription. No account. No ads. Works with zero signal — in the basement, on the rack, in the hole.

BUILT FOR THE FIELD

• Feet-inch-fraction keypad made for gloved hands — big keys, big text
• Live diagrams that redraw as you type
• Fitting-angle presets: 5.625° to 90°, plus custom
• Metric mode throughout (mm in, mm out)
• Tap any result to switch ft-in / inches / mm

THE MATH IS THE PRODUCT

• Take-outs from published ASME B16.9 dimensions — including the small-size values the simple formula gets wrong
• Pipe data from ASME B36.10M published weights
• Welder's gap handled per joint, adjustable, zero allowed
• "Show My Work" on every calculation — formula, your numbers, full-precision result, final fraction

FREE FOREVER Simple offsets (known & unknown angle), slope & drop, and the feet-inch calculator with paperless tape — full versions, no limits. Prove the math on a real job before you pay a dime.

FITTERCALC PRO — ONE PURCHASE Cut lengths with take-outs and gap, rolling offsets, rolling cut lengths, cutback & elbow cut marks, full pipe data tables, and saved jobs with shareable cut lists.

Found an answer you can question? The Show My Work screen has a report link. It gets fixed.