Plumbing Formulator
Forumulas for Plumbers
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Don't miss the scheduling and billing parts of the app.
PLUMBING FORMULATOR is the ultimate professional calculator for plumbers, HVAC techs, and mechanical contractors. Over 200 formulas, reference charts, code
books, and pro tools in your pocket.
CALCULATORS AND FORMULAS
Water Flow and Supply: pipe velocity, flow rate, GPM, fixture unit demand, and supply sizing.
Pipes and Piping: area, volume, and weight for copper, steel, cast iron, and plastic. Hazen-Williams friction loss, pressure ratings, and 45 degree offsets.
Drainage and Venting: drain sizing, slope and fall, vent sizing, fixture units, and wet vents.
Water Heaters: BTU requirements, recovery rates, tank sizing, first hour ratings, and hot water demand.
Pumps and Pressure: water and brake horsepower, efficiency, head pressure, velocity head, and PSI to feet of head.
Storm Drainage: roof drains, rainfall intensity, gutter and leader sizing, and retention.
Gas Piping: size natural gas and propane lines, BTU loads, pressure drop, and appliance demand.
Medical Gas: size oxygen, nitrogen, nitrous oxide, and medical air. Vacuum demand and manifolds per NFPA 99.
Swimming Pools: volume, fill time, pump sizing, turnover, evaporation loss, and main drains.
Septic and Sewage: septic tanks, leach fields, and sewage pump capacity.
Thermal Expansion: expansion tank sizing, system pressure, and pipe length changes.
REFERENCE MATERIALS
Charts and Tables: dozens of reference charts including pipe sizing, fixture units, and materials in PDF.
Massachusetts Plumbing Code: complete 248 CMR reference with all chapters.
Plumbing Design Guide: a 24 chapter design and installation guide.
Technical Drawings: professional diagrams and installation details.
TOOLS AND FEATURES
Pipe Cut List Optimizer: enter lengths and stock sizes for an optimized cutting plan that cuts waste.
Unit Conversions: length, area, volume, flow, pressure, temperature, weight, and power.
Geometry Calculators: area and volume for circles, rectangles, triangles, cylinders, spheres, cones, and more.
BUSINESS MANAGEMENT
More than a calculator. Tap Business to run your service company from the same app.
Customers: contacts, service addresses, job history, and outstanding balances.
More than a calculator. Tap Business to run your service company from the same app.
Customers: contacts, service addresses, job history, and outstanding balances.
Quotes and Estimates: build quotes on site and turn an approved quote into an invoice with one tap.
Invoicing: branded invoices with your logo, parts and labor, taxes, and terms. Send by email, print, or PDF.
Payments: cash, check, card, ACH, or credit. Apply one payment across invoices and manage credit automatically.
Scheduling: book service calls, track jobs, and set up recurring contracts that auto-generate invoices.
Business Reports: balances, receivable aging, revenue, and payment history. Export as CSV or PDF.
Business features are a separate one-time upgrade, discounted for existing Bill-Craft and ServiceBoss customers.
PLUMBING PRO FEATURES
Upgrade to Plumbing Pro to save calculations with full detail, export results, keep unlimited history, and remove ads. One time purchase with lifetime access.
A modern dark interface built for the job site, with breakdowns showing the steps and formulas behind every result. Perfect for plumbers, apprentices, HVAC
techs, mechanical engineers, and building inspectors.
Download Plumbing Formulator today and put professional plumbing calculations at your fingertips.
Includes additional support for metric
The developer, Historycentral.com, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Historycentral.com Inc
- Size
- 129.1 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - iPad
Requires iPadOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.6 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro Version $1.99
- Growth $9.99
- Starter $5.99
- Pro Purchase $3.99
- Copyright
- © Historycentralcom 2026

