Plutocalc Water
Instant calculations for environmental professionals

Plutocalc is a free problem solver suite for water treatment, wastewater, hydraulics, environmental chemistry and unit conversions. Plutocalc calculations were carefully tuned to require minimal inputs and provide accurate results based on the latest advances in science and engineering.


  • 92 solvers
  • 2466+ possible calculations
  • Unit conversions
  • Chemicals database
  • Results as you type
  • Plant operation and design emphasis
  • Mobile phones and tablets supported
  • Offline calculations
  • Online, App and Portable versions
  • Multiple languages
  • Beautiful print
  • Free and fast. Very fast!

What's new

  • Version 10
    • New RO/NF skid designer (defines the amount of stages and pressure vessels)
    • New UV disinfection solver
    • Interface improvements for the overall disinfection solvers
    • Interface improvements for the overall chemical properties solvers
    • Minor bug fixes
    • Plutocalc+ now on Windows 10
    • All changes and version history
  • Version 9 - Anniversary edition
    • New boiler blowdown and water quality solver
    • New municipal plant capacity estimation solver
    • New buffer tank size solver
    • New conductivity conversions solver
    • Specific Gravity property added to chemical solutions
    • All changes and version history

Download for free

Get it on Google Play Get it on the Amazon App Store Download from the Microsoft Windows Store Download from the Apple iTunes Store

Plutocalc+ version 10

If you like Plutocalc and want to support the development of new versions, try Plutocalc+ available only trough app stores.

Plutocalc+ has the same calculation models of the regular version but comes with some gifts for the generous supporters:

  • Early release of new versions: get the new features before everyone. Does not apply for security or bug fixes.
  • PlutoPad: a tool to log calculation inputs and outputs (tap the "+" sign to copy the active field)
  • Priority support by e-mail in English, Portuguese or Spanish
Get it on Google Play Download from the Apple iTunes Store Download from the Microsoft Windows Store

Model/Solver list

Unit conversions

Geometry and sizing standards

Energy, head loss and power

Contaminants and quality indices

Solutions and Chemicals

Adsorption and Ion Exchange

Filters and membranes (Ultrafiltration, Nanofiltration and Reverse Osmosis)

Chemical and biological reactions



Custom versions and corporate sponsorship

Plutocalc is distributed for free but you can propose custom calculation solvers, purchase Plutocalc+ or create a customized private label version for your business and customers. Please check the Plutocalc Business Model for more information and contact the developer if you need more details.


Please contact the developer at for feature requests, bug reporting and the sponsorship program. Translation contributions are always welcome.


Creative Commons License

Plutocalc by Daniel Brooke Peig is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
The calculation results can be used for any purpose, including commercial projects, for free.

Privacy policy

Plutocalc application does not collect or transmit any data from it's users or from the systems where it runs.
The website might collect anonymous navigation statistics such as the user agent, operating system, IP address, pages accessed and the country of origin. Any data that could lead to a possible user identification (like the IP address) will be kept in secret from 3rd parties like partners, sponsors and affiliates.