epanet-js
No installs. No forced cloud storage. Just fast, local-first water modeling — powered by the engine you already trust.
You shouldn't have to choose between speed, security, and affordability just to understand your water networks.


If you are hesitant to open your computer case, you can often find the specs through external records.
If your computer is a pre-built brand (like HP, Dell, Lenovo, or Acer), you might be able to find the specs online without opening the case.
| DC Output | +3.3V | +5V | +12V | -12V | +5Vsb | | |-----------|-------|-----|------|------|-------|-----------------| | Max Current | 22A | 18A | 54A | 0.5A | 3A | 650W |
Use online PSU calculators (OuterVision, Cooler Master, Newegg). Input:
Most consumer PSUs report wattage via software because there is no data cable from the PSU to the motherboard. However:
Right, there is no standard, and there will be no method to create one via software unless there are changes to the ATX hardware s... Reddit PC Power Supply Calculator – PSU Wattage ... - Newegg Frequently Asked Questions * What is the Newegg PC power supply calculator? A power supply calculator is a tool that estimates the... Newegg How can I tell what my wattage on my PSU is without having to ... 4 May 2022 —
No setup or downloads — just instant access right in your browser.
EPANET was a gift to the industry — free, open-source water modeling for all. But commercial vendors built on it, locked away improvements, and left the community behind.
epanet-js is our answer: a faster, simpler, affordable water modeling tool that protects your privacy and sustains the open-source future of water modeling.
We're proud to be part of the next chapter — and we're just getting started.

When you purchase more features in epanet-js, you're investing in the future of open-source EPANET development.
Our open-source model balances innovation and accessibility:
Anyone can build on our code. The two-year commercial-use delay gives us the incentive to keep pushing forward — and that fuels progress for everyone.
That means when you support us, you support more affordable hydraulic modeling software for the entire community.
Choose the plan that works for you
Individual named license
Floating shared license
Have questions? or book a call.
Available for non-commercial projects, learning, and student work. how do i check my psu wattage
For curious minds and personal growth.
Free for students and teachers.
Find answers to common questions about epanet-js.
No install. No login. No cloud required.
If you are hesitant to open your computer case, you can often find the specs through external records.
If your computer is a pre-built brand (like HP, Dell, Lenovo, or Acer), you might be able to find the specs online without opening the case.
| DC Output | +3.3V | +5V | +12V | -12V | +5Vsb | | |-----------|-------|-----|------|------|-------|-----------------| | Max Current | 22A | 18A | 54A | 0.5A | 3A | 650W |
Use online PSU calculators (OuterVision, Cooler Master, Newegg). Input:
Most consumer PSUs report wattage via software because there is no data cable from the PSU to the motherboard. However:
Right, there is no standard, and there will be no method to create one via software unless there are changes to the ATX hardware s... Reddit PC Power Supply Calculator – PSU Wattage ... - Newegg Frequently Asked Questions * What is the Newegg PC power supply calculator? A power supply calculator is a tool that estimates the... Newegg How can I tell what my wattage on my PSU is without having to ... 4 May 2022 —
Simple, quick, and useful right out of the gate — designed to open-and-go.
Launch epanet-js now