Plumber’s toolbox

Plumber MojaWoda.com

Plumber's toolbox

A collection of practical calculators and converters for plumbers and water filter service technicians. Choose a tool and go to a dedicated page with calculations and a description of how to use it.

Search for a tool (e.g. thread, RO, hardness)...
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🧵

Pipe thread calculator

Helps you quickly match the thread type and size for fittings, tees, housings, reducers and valves. Especially useful when standards are mixed within one installation (e.g. components from different sources).

Most common use: thread identification - fitting selection - avoiding a wrong purchase.
Threads BSP/NPT Fittings
Open
📏

Inch to cm converter

Quick conversion of inch - cm - mm for diameters, hoses and connections. Useful for RO sets, push-fit connectors, reducers and imported parts where the description is sometimes given only in inches.

Most common use: hose diameter selection - comparing 1/4, 3/8, 1/2 with mm.
Dimensions Conversions Installation
Open
🧾

Water usage calculator

Makes it easier to estimate water consumption in a home or small business. Useful when sizing whole-building filtration, planning service and calculating real operating costs (e.g. with a softener).

Most common use: quick customer interview - solution sizing - comparing options.
m3 Sizing Service
Open
🧂

Water softener sizing

A tool for the initial sizing of softener parameters based on the number of people, hardness and usage. It helps determine resin volume and the expected regeneration frequency to avoid a station that is too small or too large.

Most common use: sizing for a house/apartment - quick regeneration simulation - customer discussion.
Softener Regeneration Salt
Open
💧

Water hardness converter

Conversion between °dH, ppm and mg/l CaCO3. Useful when a customer gives a test result in a different unit, or when you compare utility data with on-site measurements. It makes it easier to quickly classify a scaling problem.

Most common use: test interpretation - treatment selection - checking the effect after service.
Hardness ppm CaCO3
Open
🚰

RO membrane - GPD

A converter of RO membrane performance from GPD to liters per day. It makes it easier to compare membranes and estimate in advance whether the installation will keep up with water production at a given demand (e.g. kitchen, gastronomy, aquarium).

Most common use: membrane selection - performance check - quick consultation before purchase.
RO GPD Performance
Open
🧂

Salt consumption calculator

Estimates salt consumption in a water softener on a monthly and yearly basis. It helps the customer understand operating costs, and helps the service technician assess more quickly whether regeneration settings are reasonable for the given usage and hardness.

Most common use: operating cost - refill planning - settings optimization.
Salt Costs Softener
Open
📈

Flow calculator

Converts l/min and m3/h and helps calculate volume over time (e.g. how many liters in 10 minutes). Useful when sizing sediment filters, UV lamps, water treatment stations, and also when diagnosing pressure drops.

Most common use: performance verification - device sizing - quick diagnosis on site.
l/min m3/h Sizing
Open
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About the toolbox

The toolbox is a starting page for installers, plumbers and water filter service technicians.

How to use it:
- search for a tool by keyword (e.g. thread, RO, hardness)
- open the tool page and perform the calculations
- use the result for component selection or service.