PlumbCalc PRO — $19 a month
Put your company on the quote. Your name, licence number and logo on every estimate you hand a customer — plus saved projects and the PRO calculators. $19 a month, cancel anytime. The calculators and every answer on this site 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. |
| Branded quotes | Your company name, address, phone, licence and logo on the PDF you hand the customer. |
| Every future PRO calculator | Included while you subscribe. No upsell later, no add-on tiers. |
What you are actually paying for
Not the arithmetic. The calculators are free and staying free. You are paying for the thing you hand the customer: a quote with your name, licence and logo on it instead of a number read off a phone screen. The quote is where the job is won or lost, and that is the part worth paying for.
Nineteen dollars is a fraction of one billable hour. If a branded quote wins one job a year that a scribbled figure would have lost, it has paid for itself many times over.
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 19 dollars a month. The free calculators stay free — you are paying for branded quotes and saved jobs, not for the arithmetic.
Can I cancel?
Yes, anytime, and you keep PRO to the end of the month you already paid for. No cancellation fee and no minimum term.
What happened to the $29 lifetime deal?
It is retired — PRO is a subscription now. If you bought the one-time lifetime PRO before 2 September 2026 you keep it permanently and you will never be billed. We sold that word and we meant it.
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. PRO is for branded quotes and saved jobs.