About Plumbing Formulator
PLUMBING FORMULATOR is the ultimate professional calculator for plumbers, HVAC technicians, and mechanical contractors. With over 200 formulas and calculators, reference charts, code books, and professional tools, this...
PLUMBING FORMULATOR is the ultimate professional calculator for plumbers, HVAC technicians, and mechanical contractors. With over 200 formulas and calculators, reference charts, code books, and professional tools, this app puts essential plumbing calculations right in your pocket. CALCULATORS AND FORMULAS Water Flow and Supply Calculate pipe velocity, volume flow rate, gallons per minute, fixture unit demand, and water supply sizing. Determine optimum flow rates and total pipe dimensions for any project. Pipes and Piping Calculate pipe area, volume, weight of various pipe materials including copper, steel, cast iron, and plastic. Determine friction loss using Hazen-Williams formula, pressure ratings, expansion due to temperature changes, and offset calculations for 45 degree bends. Drainage and Venting Size drain pipes, calculate slope and fall, determine vent pipe sizing, and figure drainage fixture units. Includes horizontal and vertical wet vent calculations. Water Heaters Calculate BTU requirements, recovery rates, storage tank sizing, first hour ratings, and domestic hot water demand. Determine energy costs and efficiency ratings. Pumps and Pressure Calculate water horsepower, brake horsepower, pump efficiency, head pressure, velocity head, and system curves. Convert between PSI and feet of head. Storm Drainage Size roof drains, calculate rainfall intensity, determine gutter and leader sizing, and figure retention requirements. Gas Piping Size natural gas and propane lines, calculate BTU loads, determine pressure drop, and figure appliance demand. Medical Gas Systems Size oxygen, nitrogen, nitrous oxide, and medical air piping. Calculate vacuum system demand, pressure drop, cylinder manifold requirements, and system flow rates per NFPA 99 standards. Swimming Pools Calculate pool volume for rectangular and circular pools, determine fill time, pump sizing, turnover rates, evaporation loss, and main drain requirements. Septic and Sewage Size septic tanks, calculate leach field requirements, and determine sewage pump capacity. Thermal Expansion Calculate expansion tank sizing, system pressure, and pipe length changes due to temperature. REFERENCE MATERIALS Charts and Tables Access dozens of professional plumbing reference charts including pipe sizing tables, fixture unit charts, and material specifications in PDF format. Massachusetts Plumbing Code Complete 248 CMR plumbing code reference with all chapters available for quick lookup. Plumbing Design Guide Comprehensive 24 chapter plumbing design and installation guide covering residential, commercial, and specialized systems. Technical Drawings Professional plumbing diagrams and installation details. TOOLS AND FEATURES Pipe Cut List Optimizer Enter your required pipe lengths and stock sizes to get an optimized cutting plan that minimizes waste. Unit Conversions Convert between US and metric units for length, area, volume, flow rate, pressure, temperature, weight, and power. Geometry Calculators Calculate area and volume for circles, rectangles, triangles, cylinders, spheres, cones, and other shapes. PLUMBING PRO FEATURES Upgrade to Plumbing Pro for additional capabilities including saving calculations with full input and output details, exporting results, unlimited calculation history, and an ad-free experience. One time purchase with lifetime access. The app features a modern dark interface designed for easy use on the job site. All calculators include detailed breakdowns showing the calculation steps and formulas used. Perfect for licensed plumbers, apprentices, HVAC technicians, mechanical engineers, building inspectors, and anyone working in the plumbing and mechanical trades. Download Plumbing Formulator today and have professional plumbing calculations at your fingertips.
Version History Minor UI changes 6.0.2 May 11 Totally rewritten code base for modern devices, 70 new formulas, new drawings, Mass plumbing code. Ability to save and compare results Plus minor bug fix. 6.0.1 Feb 14 Totally rewritten code base for modern devices, 70 new formulas, new drawings, Mass plumbing code. Ability to save and compare results. 6.0 Feb 12 This update from Apple will improve the functionality of this app. No new features are included. Bug fixes and optimized for iPhone X 5.2 11/07/2017 Many bug fixes, improved interface- pro features now free NO In App purchase 5.1 10/17/2016 Totally rewritten from scratch in Swift. No base code to allow us to add an increase functionality. In app purchase gives you Plumbing Handbook by US Army, charts access to the Plumbing Code and for the first time the formulas. 5.0 01/29/2016 Additional Metric Info, minor bug fixes 4.1 03/26/2013 iPhone 5 compatible,140 charts added 4.0 10/10/2012 42 New Piping Formulas. Ipad Retina Compatibility 3.6 03/18/2012 New interface, support for ePrinting, new metric formulas 3.5 01/26/2012 iPad Native, Over one hundred new conversion, new area formulas 3.0 12/14/2010 New conversion from fractions to decimal and meters New formula to calculate rainwater requirement of roof drain Metric formulas for water flow 2.8 03/26/2010 Darcy Weisbach Friction Loss Method 2.7 02/09/2010 Rolling Offset for Different Angles Metric Pipe Length Change with built in thermal coefficient Radiant values of material built in to heat loss. New Conversion Square Measures Metric Conversion In² to cent², Ft² to Mt²Acres to Hectors Acres to Square Kilometers and reverse of the above Cubic conversion: Cubic Inches to Cubic Centimeters, Cubic Feet to Cubic Meters and Cubic Yards to Cubic Meters and the reverse of the above. 2.6 12/09/2009 New Area Formula's Including Area of Cylinder Base Length of Cylinder Diameter of Circle Area of Ellipse Area of Hexagon Area of Parallelogram Total Fall of Pipe 45 degree offset 8 Formulas for Centrifugal Pumps Bg fix for conversion of Kilometers and Kilo 2.5 10/16/2009 Centrifugal Pumps: Pipe Velocity Water Horsepower Brake Horsepower-pump Efficiency of Pump Brake Horsepower of Motor Pressure Head Feet Water Flow- Metric Calculation 2.4 08/28/2009 New Water Heater Formulas: Natural Gas BTU input, Gallons Per Hour for Gas, Average Daily Hot Water Use 20 BTU Conversion Formulas Metric Version of Pipe Needed and Liters Used 2.3 07/20/2009 2.2 05/31/2009 2.1 05/01/2009 2.0 04/06/2009 1.1 02/28/2009 1.0 01/30/2009
Previous Versions
Here you can find the changelog of Plumbing Formulator since it was posted on our website on 2016-09-25 08:40:11.
The latest version is 6.0.2 and it was updated on 2026-06-09 18:57:57. See below the changes in each version.
Plumbing Formulator version 6.0.2
Updated At: 2026-06-09
Changes: Version History Minor UI changes 6.0.2 May 11 Totally rewritten code base for modern devices, 70 new formulas, new drawings, Mass plumbing code. Ability to save and compare results Plus minor bug fix. 6.0.1 Feb 14 Totally rewritten code base for modern devices, 70 new formulas, new drawings, Mass plumbing code. Ability to save and compare results. 6.0 Feb 12 This update from Apple will improve the functionality of this app. No new features are included.
Bug fixes and optimized for iPhone X 5.2 11/07/2017 Many bug fixes, improved interface- pro features now free NO In App purchase 5.1 10/17/2016 Totally rewritten from scratch in Swift. No base code to allow us to add an increase functionality. In app purchase gives you Plumbing Handbook by US Army, charts access to the Plumbing Code and for the first time the formulas. 5.0 01/29/2016 Additional Metric Info, minor bug fixes 4.1 03/26/2013 iPhone 5 compatible,140 charts added 4.0 10/10/2012 42 New Piping Formulas. Ipad Retina Compatibility 3.6 03/18/2012 New interface, support for ePrinting, new metric formulas 3.5 01/26/2012 iPad Native, Over one hundred new conversion, new area formulas 3.0 12/14/2010 New conversion from fractions to decimal and meters
New formula to calculate rainwater requirement of roof drain
Metric formulas for water flow 2.8 03/26/2010 Darcy Weisbach Friction Loss Method 2.7 02/09/2010 Rolling Offset for Different Angles
Metric Pipe Length Change with built in thermal coefficient
Radiant values of material built in to heat loss.
New Conversion Square Measures Metric Conversion
In² to cent², Ft² to Mt²Acres to Hectors Acres to Square Kilometers and reverse of the above
Cubic conversion: Cubic Inches to Cubic Centimeters, Cubic Feet to Cubic Meters and Cubic Yards to Cubic Meters and the reverse of the above. 2.6 12/09/2009 New Area Formula's Including
Area of Cylinder Base
Length of Cylinder
Diameter of Circle
Area of Ellipse
Area of Hexagon
Area of Parallelogram
Total Fall of Pipe
45 degree offset
8 Formulas for Centrifugal Pumps
Bg fix for conversion of Kilometers and Kilo 2.5 10/16/2009 Centrifugal Pumps:
Pipe Velocity
Water Horsepower
Brake Horsepower-pump
Efficiency of Pump
Brake Horsepower of Motor
Pressure
Head Feet
Water Flow- Metric Calculation 2.4 08/28/2009 New Water Heater Formulas:
Natural Gas BTU input, Gallons Per Hour for Gas, Average Daily Hot Water Use
20 BTU Conversion Formulas
Metric Version of Pipe Needed and Liters Used 2.3 07/20/2009 2.2 05/31/2009 2.1 05/01/2009 2.0 04/06/2009 1.1 02/28/2009 1.0 01/30/2009
Plumbing Formulator version 6.0.1
Updated At: 2026-02-14
Changes: Totally rewritten code base for modern devices, 70 new formulas, new drawings, Mass plumbing code. Ability to save and compare results Plus minor bug fix.
Plumbing Formulator version 5.2
Updated At: 2017-11-07
Changes: Nov 7, 2017 Version 5.2
This app has been updated by Apple to display the Apple Watch app icon.
Bug fixes and optimized for iPhone X
Plumbing Formulator version 5.2
Updated At: 2017-11-07
Changes: Nov 7, 2017 Version 5.2
This app has been updated by Apple to use the latest Apple signing certificate.
Bug fixes and optimized for iPhone X
Plumbing Formulator version 5.2
Updated At: 2017-11-07
Changes: Nov 7, 2017 Version 5.2
Bug fixes and optimized for iPhone X
Plumbing Formulator version 5.2
Updated At: 2017-11-07
Changes: 7. Nov. 2017 Version 5.2
Bug fixes and optimized for iPhone X
Plumbing Formulator version 5.0
Updated At: 2009-01-30
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