Comparison

Plumbing Formulator vs Pipe Fitting

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Plumbing Formulator

This professional calculator app provides over 200 formulas, calculators, and reference materials for plumbers, HVAC technicians, and mechanical contractors. It covers a wide range of calculations for water flow, piping, drainage, water heaters, pumps, and more, all in one pocket-sized tool.

Highlights
  • Over 200 formulas and calculators
  • Water flow and supply calculations
  • Pipe and piping calculations
  • Drainage and venting calculations
  • Water heater and pump calculations
  • Reference charts and code books
  • Pipe cut list optimizer
Features
Read full description

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.

About

Pipe Fitting

This tool provides precise pipe layout calculations for professionals in welding and fabrication. It offers various offset and fitting calculators, along with data tools for custom angles and triangle solutions. Easily switch between imperial and metric units for field or shop use.

Highlights
  • Offset calculators (basic, rolling, parallel)
  • Back-to-back fitting solutions
  • Elbow miter cut and triangle solver
  • Imperial and metric unit switching
  • Designed for iPhone and iPad
Features
Read full description

Pipe Fitting Calculator is the all-in-one solution for pipefitters, welders, and fabricators who need fast and accurate pipe layout calculations in the field or the shop. Designed for iPhone & iPad, this powerful tool delivers pro-level precision with a clean, easy-to-use interface—built specifically for real-world jobsite demands. Offset Calculators – Basic Offset – Fast and reliable offset math – Rolling Offset – Handles advanced rolling angles – Rolling Offset – Handles advanced rolling angles – Parallel Offset – Multi-line equal spread configurations Back-to-Back Fittings – X° + Y° Elbows – Compound angle fitting solutions – 90° + X° Elbows – Odd-angle transitions simplified Data Tools – Elbow Miter Cut Create custom angles from standard 90s – Triangle Solver – Instantly solve triangle dimensions, angles, and area You can easily switch between imperial(inches) or metric(cm) Pipe Fitting Calculator is one stop solution for fast and accurate bending! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Plumbing Formulator4 screens
Pipe Fitting1 screens

Verdict

The call

The clearest difference is ads: Plumbing Formulator at none against Pipe Fitting's shown. Plumbing Formulator also leads on monetization model (free vs free with in-app purchases). Pipe Fitting's advantage is update cadence (every 5 days vs every 2 months) and review sentiment (33% vs 9%). On price, rating, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Plumbing Formulator sells 4 one-off in-app purchases and Pipe Fitting sells 2 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.6 for Plumbing Formulator against 4.6 for Pipe Fitting. That said, the two scores are not equally well evidenced: Pipe Fitting has 116 ratings behind it against 7, so its average is the more settled of the two. Written reviews are what separate them: 9% of Plumbing Formulator's written reviews are positive against 33% of Pipe Fitting's.

UpkeepUpdate frequency

Plumbing Formulator ships an update every 2 months, Pipe Fitting every 5 days. The most recent releases landed on August 23, 2026 and September 19, 2026 respectively.

Scorecard6 real differences · 4 level
Plumbing Formulator versus Pipe Fitting: the parameters behind the verdict, then further details
ParameterPlumbing FormulatorPipe Fitting
PriceFreeFree
Rating4.6 (7 ratings)4.6 (116 ratings)
Positive reviews9.1% of reviews33.3% of reviews — better
Number of ratings7116 — better
Update frequencyEvery 2 monthsEvery 5 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.616.4 — better
Further details — not scored
Size123 MB42 MB
Age rating4+4+
DeveloperHistorycentral.comxNeat.com

Customer experience

Plumbing Formulator

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews11 reviews
Positive9.1%
Neutral0.0%
Negative90.9%

Pipe Fitting

All ratings116 ratings
Positive89.7%
Neutral5.2%
Negative5.2%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

In-app purchases

4 purchases

Plumbing Formulator

One-time4
  • Pro Version$1.99
  • Pro Purchase$3.99
  • Starter$5.99
Show 1 more
  • Growth$9.99
2 purchases

Pipe Fitting

Subscriptions2
  • Pipe Fitting3 Days trial$4.997 Days
  • Pipe Fitting7 Days trial$39.991 Year

Questions

Is Plumbing Formulator free?
Plumbing Formulator is free to download, with in-app purchases available.
Is Pipe Fitting free?
Pipe Fitting is free to download, with in-app purchases available.
Which has better reviews, Plumbing Formulator or Pipe Fitting?
Plumbing Formulator and Pipe Fitting are both rated 4.6 out of 5 on the App Store, from 7 and 116 ratings respectively.
Do Plumbing Formulator or Pipe Fitting have ads?
Pipe Fitting shows ads; Plumbing Formulator does not.
Which is updated more often, Plumbing Formulator or Pipe Fitting?
Plumbing Formulator ships an update every 2 months, and Pipe Fitting every 5 days. Most recently, Plumbing Formulator was updated on August 23, 2026 and Pipe Fitting on September 19, 2026.

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