Plumbing Formulator vs HomeKept
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
HomeKept
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HomeKept helps homeowners stay ahead of maintenance before small issues become expensive repairs. Build a care plan from your home profile, climate zone, and home age, then track upcoming tasks, due dates, and costs. Manage seasonal jobs like HVAC filters, gutters, smoke detectors, water heaters, roofing, windows, and more. Mark tasks done, add notes and actual costs, and review your year from a clear annual calendar. HomeKept Pro unlocks family sharing, smart alerts, home health tracking, expense reports, and PDF exports. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://tuyennv12192.github.io/privacy_homeguard.html
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Verdict
The clearest difference is update cadence: HomeKept at every 3 days against Plumbing Formulator's every 2 months. HomeKept also leads on iOS requirement (15.0 vs 18.6). On price, ads, 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
Both are free to download. Plumbing Formulator sells 4 one-off in-app purchases and HomeKept sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Plumbing Formulator ships an update every 2 months, HomeKept every 3 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.
| Parameter | Plumbing Formulator | HomeKept |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (7 ratings) — better | — |
| Positive reviews | 9.1% of reviews | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 2 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 123 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | Historycentral.com | KHANH HA DANG |
In-app purchases
Plumbing Formulator
- Pro Version$1.99
- Pro Purchase$3.99
- Starter$5.99
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- Growth$9.99
HomeKept
- HomeGuard Pro Monthly$4.991 Month
- HomeGuard Pro Annual7 Days trial$39.991 Year
Questions
Is Plumbing Formulator free?
Is HomeKept free?
Do Plumbing Formulator or HomeKept have ads?
Which is updated more often, Plumbing Formulator or HomeKept?
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