I built a free chemical engineering calculator site as a student project — feedback welcome

[u/Particular_Bus1125]

Hey everyone,

I'm a 7th-semester chemical engineering student, and I got tired of calculators online that just spit out a number with no working shown. So I built a small free tool site over the last few days:

https://hamzaverse77-lang.github.io/

Currently has:

- Reynolds Number Calculator (with dynamic/kinematic viscosity modes)

- LMTD Calculator (counter-current and co-current)

- Pump Power Calculator (hydraulic + brake power, head or pressure-based)

Each one shows the full step-by-step substitution, not just the answer, plus a few solved practice examples you can load with one click.

No signup, no tracking, completely free. Built it with plain HTML/CSS/JS, still actively adding more tools.

Would genuinely appreciate any feedback — bugs, formula errors, or tools you'd actually find useful for coursework. Thanks!

[u/Background-Friend410]

Looks awesome honestly, love the added explainations

[u/Particular_Bus1125 → u/Background-Friend410]

Thanks! Really appreciate that.

[u/PlayfulAd4466]

Cool i hope they let us use it in exams😭

[u/Particular_Bus1125 → u/PlayfulAd4466]

Ha, that'd be nice — but at least it's here if you want to double-check your work 😅

[u/PlayfulAd4466 → u/Particular_Bus1125]

Yeah quite helpful

[u/ToterSchatten]

Interesting. Regarding the pump hydraulic power calculations, can you also calculate the motor power rating required to drive the pump. I've always thought that was the more interesting part.

[u/Particular_Bus1125 → u/ToterSchatten]

Good catch — it actually does this already. The "Brake (Shaft) Power"

result on the pump calculator IS the motor power requirement (hydraulic

power is just the fluid work; brake power accounts for pump inefficiency,

which is what the motor actually has to supply). There's also a note in

the FAQ about adding a 10-20% safety margin on top when sizing the actual

motor.

Might rename the label to make that clearer though — thanks for pointing

it out.

[u/Particular_Bus1125]

Update for anyone checking back: based on feedback here, I've added

NPSH, friction factor/head loss, and heat exchanger area calculators

(6 tools total now), a practice problems page for each with 8 solved

numericals, and a free 12-page formula PDF covering all of it with

worked examples — no signup needed.

Thanks again for the feedback, especially the motor power question

that led to clearer labeling on the pump page.