Last updated 7 September 2026
SpoolCalc is a calculation aid, not a substitute for your own measurement and judgement. Check every result against the pipe and fittings in front of you before you cut.
By installing or using SpoolCalc you agree to these terms. If you do not agree, do not use the app.
SpoolCalc is distributed through the App Store and Apple's Licensed Application End User License Agreement also applies. Where the two differ on a point Apple's agreement covers, Apple's agreement governs.
We grant you a personal, non-exclusive, non-transferable licence to use SpoolCalc on devices you own or control. You may not copy, sell, rent, reverse engineer or redistribute the app.
SpoolCalc Pro is a one-time, non-consumable purchase. It is not a subscription and it will not renew or charge you again. It unlocks Rolling Offset, Parallel Offset, Miter Cut, Branch Cut and Cutback on the Apple Account that bought it, and can be restored on your other devices with Restore Purchase.
Offset and Fitting Specs are free and will remain free.
All payments are processed by Apple. Refunds are handled by Apple under their policy, not by us. We cannot issue refunds directly, but if something is wrong please write to us anyway so we can fix it.
SpoolCalc calculates from the measurements you enter and from published fitting dimensions. Fitting dimensions follow ASME B16.9, U.S. Customary tables, and are nominal values. Real fittings vary within manufacturing tolerance, and different manufacturers, materials and schedules differ.
You remain responsible for:
Nothing this app produces is engineering advice, a code compliance check or an approved drawing. It does not replace your foreman, your engineer, your inspector or the project specification.
SpoolCalc is provided "as is", without warranty of any kind, express or implied, including any warranty of merchantability, fitness for a particular purpose or accuracy. We do not warrant that the app is free of errors or that its results will suit every situation.
To the maximum extent permitted by law, CLK Company is not liable for any indirect, incidental or consequential loss arising from use of the app, including wasted material, rework, downtime or lost profit. Our total liability for any claim will not exceed the amount you paid for the app.
Some jurisdictions do not allow these exclusions, so parts of this section may not apply to you.
We may update these terms. The current version is always on this page with its date. Continuing to use the app after a change means you accept the updated terms.