LDL Calculator

Professional LDL Cholesterol Calculation Tool

Available on the App Store

Get accurate LDL cholesterol calculations using the proven Friedewald equation

About the App

LDL Calculator is a professional tool that uses the proven Friedewald equation to calculate LDL cholesterol from your total cholesterol, HDL cholesterol, and triglycerides values.

Accurate Calculation

Uses the medical-standard Friedewald equation trusted by healthcare professionals worldwide.

Input Validation

Built-in validation ensures accurate results and warns about limitations.

Clean Interface

Simple, intuitive design makes cholesterol calculation quick and easy.

Privacy Focused

No data collection, no accounts required. All calculations performed locally.

⚠️ Medical Disclaimer

This app is for educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare professional for medical advice and interpretation of cholesterol results.

The Friedewald equation is valid when triglycerides are less than 400 mg/dL. Results may not be accurate for patients with very high triglyceride levels.

How to Use

  1. Enter your Total Cholesterol value (mg/dL)
  2. Enter your HDL Cholesterol value (mg/dL)
  3. Enter your Triglycerides value (mg/dL)
  4. Tap Calculate to see your LDL result
  5. Use Clear to reset all fields

The Friedewald Equation

The app uses the standard Friedewald equation:

LDL = Total Cholesterol - HDL - (Triglycerides ÷ 5)

This equation has been used in clinical practice for decades and is recommended by major medical organizations.

Privacy Policy

Data Collection: This app does not collect, store, or transmit any personal data or health information. All calculations are performed locally on your device.

Analytics: No usage analytics or tracking are implemented.

Third Parties: No data is shared with third parties.

Storage: No user data is stored on our servers or any external services.

Support & Contact

Developer: Georgios Peppas

Email: cretapp@icloud.com

App Version: 1.0

Platform: iOS 15.0+

For support requests, bug reports, or questions about the app, please contact us via email. We aim to respond within 24-48 hours.

System Requirements

Medical References & Citations

The LDL calculation in this app is based on peer-reviewed medical literature and established clinical practice:

Primary Reference

Friedewald, W.T., Levy, R.I., & Fredrickson, D.S. (1972). "Estimation of the concentration of low-density lipoprotein cholesterol in plasma, without use of the preparative ultracentrifuge." Clinical Chemistry, 18(6), 499-502.

Supporting Literature

  • National Cholesterol Education Program (NCEP) Expert Panel (2001). "Executive Summary of The Third Report of The National Cholesterol Education Program (NCEP) Expert Panel on Detection, Evaluation, And Treatment of High Blood Cholesterol In Adults (Adult Treatment Panel III)." JAMA, 285(19), 2486-2497.
  • American Heart Association (2019). "2019 AHA/ACC/AACVPR/AAPA/ABC/ACPM/ADA/AGS/APhA/ASPC/NLA/PCNA Guideline on the Primary Prevention of Cardiovascular Disease." Journal of the American College of Cardiology, 74(10), e177-e232.
  • European Society of Cardiology (2019). "2019 ESC/EAS Guidelines for the management of dyslipidaemias: lipid modification to reduce cardiovascular risk." European Heart Journal, 40(2), 143-205.

Clinical Validation

The Friedewald equation has been validated in numerous studies and is recommended by:

  • American Heart Association (AHA)
  • American College of Cardiology (ACC)
  • European Society of Cardiology (ESC)
  • National Heart, Lung, and Blood Institute (NHLBI)

Limitations

As documented in medical literature, the Friedewald equation is not accurate when:

  • Triglycerides exceed 400 mg/dL (4.5 mmol/L)
  • Patient is not fasting
  • Presence of type III hyperlipoproteinemia

Note: These references are provided for educational purposes. This app does not replace professional medical advice or laboratory testing.

Frequently Asked Questions

Is this app medically accurate?

Yes, the app uses the standard Friedewald equation that has been validated in medical literature and is widely used by healthcare professionals.

Can I use this for medical decisions?

No, this app is for educational purposes only. Always consult with your healthcare provider for medical advice and interpretation of cholesterol results.

Does the app store my health data?

No, all calculations are performed locally on your device. No data is stored, transmitted, or shared.

What if my triglycerides are over 400 mg/dL?

The app will warn you that the Friedewald equation is not accurate when triglycerides exceed 400 mg/dL. In such cases, direct LDL measurement is recommended.