calculator logoKalkulatorPro

Engineering calculators

for your entire team

Standardize calculations across your office. Compliant with PN-EN standards, available on any device, no training needed.

PN-EN Standards

Mobile — tablet, phone

No training — 30 sec to start

VAT Invoice

40+ calculators for industry leaders

Sanitary Installation Designers

Electrical Engineers

Architects

Cost Estimators

Why KalkulatorPro instead of...

...Excel?
  • One formula error on-site = cost of 10x the annual subscription
  • No standard updates in spreadsheets, no data validation
  • Civil liability risk — an Excel error risks losing your professional license
...Audytor / InstalSystem?
  • Preliminary selection in 2 minutes during a client meeting
  • Works on tablet and phone — Audytor is Windows-only
  • 30 seconds to understand the interface vs. a 1000 zł training course
  • Juniors calculate projects on day one, not after a month of training
  • Automatic updates — always the latest PN-EN standards
  • Quick concept validation (5 min) — the perfect complement to a full project in Audytor
For office managers
  • Reduce concept preparation time by ~30%
  • Standardize calculations across the entire team
  • Cross-platform — your designer checks pressure drops on a smartphone at the investor's site
  • One invoice, zero administration — no more 10 separate subscriptions

Request a quote

What our

users say

Join thousands of satisfied engineers who use KalkulatorPro every day.

"We've been using KalkulatorPro in our office for several years practically every day. Highly recommended!"

MP
Marcin Pożyczka

Designer, Wodbud Instal

"An invaluable tool in an engineer's work. Recommended!"

JK
Jacek Konieczny

Construction Engineer

"Whenever I need pipes with the right diameter, whether for heating or ventilation ducts, I use KalkulatorPro. What diameter pipe to run from the boiler or heat pump to the manifolds? I find the answer here. It significantly improves work both in the office and on site."

PŁ
Piotr Łabędź

Installer, Swan-Klim

"Fantastic tools! I use the calculators practically every day for hydraulic and ventilation calculations. They greatly speed up the work – what used to take hours with Excel spreadsheets, I now do in a few minutes."

MS
Marlena Sienkiewicz

Sanitary Installation Designer

"Intuitive, powerful, and constantly evolving tool. I use it regularly for heating and plumbing projects. I especially value the pipe sizing and pressure drop calculations – the results are reliable and standards-compliant."

PG
Piotr Golonka

Sanitary Installation Designer

3000+

Satisfied users

99.9%

Service availability

4

Calculator languages

40+

Calculators

Frequently asked questions

Yes, automatically with the company VAT ID. A VAT invoice is generated with every order.

The admin panel lets you add and remove users at any time.

Yes, in the admin panel you can transfer access to another team member at any time.

The calculators comply with current PN-EN standards (including PN-EN 12831, PN-EN 12828, PN-EN 806). We update them automatically — you don't need to track regulatory changes.

Data is encrypted and stored on secure servers. Regular backups ensure continuous access.

You'll receive a quote within 24 hours. Business teams have dedicated technical support.