PlumbCalc PRO — $29, paid once
PlumbCalc PRO is a one-time $29 payment. Not a subscription. No renewal, no expiry, and every PRO calculator we add later is included. The free calculators stay free.
One click to sign in with Google, then straight to checkout. Payment is handled by Stripe; card details never touch our servers.
What you get
| Gas line sizing | NFPA 54 Table 402.4(2) longest-length method, natural gas and propane. |
| Pipe sizing | Water line sizing from GPM and developed length, with velocity checks. |
| Pipe volume & fill | Gallons per foot for every common size and material. |
| Offsets | 45s, 22.5s and rolling offsets solved from travel or run. |
| Saved projects | Keep jobs and calculations together instead of on the back of a receipt. |
| Every future PRO calculator | One payment. No subscription, no renewal, no upsell later. |
Why one payment and not a subscription
Trades software bills monthly for tools you use a few times a job. A sizing calculator is not worth a recurring bill, so it does not have one. You pay once, it is yours, and if we add a calculator next year you already own it.
Free either way
You do not need PRO to size a gas line today. The gas line sizing calculator, the full NFPA 54 capacity chart, the printable pipe sizing cheat sheet and every answer page on this site are free. PRO is for saving jobs and the deeper calculators.
Frequently asked questions
How much does PlumbCalc PRO cost?
PlumbCalc PRO is 29 dollars, paid once. It is not a subscription: there is no monthly fee, no renewal, and no expiry. The free calculators stay free.
Is it really one payment?
Yes. One payment of 29 dollars for lifetime access, including PRO calculators added after you buy.
Do I need an account?
Yes, and it is one click - you sign in with Google, no password to create. The account is what your saved projects and PRO access attach to.
What payment methods do you take?
Card payments, processed by Stripe. Card details never touch our servers.
Can I use the free calculators without paying?
Yes. The core sizing calculators and every answer page on this site are free and always will be.