O nas
What is Patrache Calculator?
Patrache Calculator (calc.patrache.studio) is a free online calculator collection designed to help you with everyday, academic, and professional calculations quickly and accurately.
As of 2026, we provide 90 calculators across 8 categories — Health, Finance, Math, Date & Time, Unit Conversion, Science & Engineering, Digital & Development, and Daily Life — with new calculators being added regularly.
Our Mission
Our goal is to make reliable calculation results accessible to everyone, instantly.
- Accuracy — Calculations are based on WHO standards, international standards, and verified math/science formulas.
- Accessibility — No sign-up or app installation required. Use directly in your browser.
- Privacy — All calculations run on your device. Your input data is never sent to any external server.
- Multilingual — Available in 20 languages including English, Korean, Japanese, and more.
Our Calculators
Zdrowie
BMI, Calorie, BMR, Body Fat, Pregnancy Due Date and more
Finanse
Loan, Compound Interest, ROI, Investment, Currency and more
Matematyka
Percentage, Age, Fraction, Standard Deviation, Average and more
Data i Czas
D-Day, Days Between Dates, Timer, Stopwatch and more
Konwersja
Length, Weight, Temperature, Volume, Area, Speed and more
Nauka
Ohm's Law, Molar Mass, Dilution, Decibel and more
Cyfrowe
PPI/DPI, Aspect Ratio, Subnet, Base Converter, Color Code
Codzienne
Electricity Cost, Tile, Paint, Alcohol, Fuel Cost and more
Technical Features
- Client-Side Computation — All calculations are processed in JavaScript on your device. No server communication needed, ensuring speed and privacy.
- Responsive Design — Optimized UI for every screen size, with dark mode support.
- Shareable Results — Share calculation results via URL or directly to social media.
- SEO Optimized — Structured data helps you find the right calculator easily through search engines.
Disclaimer
The calculators on this site are provided for reference purposes only and do not replace professional medical, financial, or legal advice. For important decisions, please consult with a qualified professional.
Contact
If you have any questions, feedback, or suggestions, please reach out to us at the email below.