Cholesterol Calculator
Reference tool, not a diagnosis
This calculator does not replace medical diagnosis, treatment decisions, or medication guidance. Review high results or existing conditions with a health professional.
Cholesterol management depends on age, blood pressure, smoking, diabetes, family history, existing cardiovascular disease, and other risk factors.
Enter lipid panel values
Enter values from a lipid panel or health screening report to review total cholesterol, HDL, LDL, triglycerides, and related markers.
Load example
The low-HDL reference threshold differs by sex.
LDL estimation is more appropriate for fasting lipid panels.
Often described as protective when higher.
Enter LDL directly if your lab report includes it. Leave blank for conditional estimation.
Used for LDL estimation eligibility and TG/HDL ratio.
Cholesterol reference results
These are general adult reference ranges. Personal targets can differ by risk factors and clinical context.
LDL is estimated
Because LDL was not entered directly, this uses the Friedewald equation. Fasting status, triglyceride level, and lab method can make the estimate differ from a lab-reported LDL value.
Total cholesterol
Desirable198 mg/dL
HDL
General reference range52 mg/dL
LDL
General reference range118 mg/dL
Triglycerides
Desirable142 mg/dL
Non-HDL
Caution146 mg/dL
Total/HDL ratio
3.81
Ratios are supporting markers, not standalone diagnostic criteria.
LDL/HDL ratio
2.26
A reference ratio comparing LDL and HDL balance.
TG/HDL ratio
2.73
A reference ratio comparing triglycerides and HDL. Meals, alcohol, and testing conditions can affect it.
Non-HDL calculation
Total cholesterol - HDL
A supporting marker that includes LDL and other atherogenic cholesterol particles such as VLDL.
LDL estimate
LDL = Total cholesterol - HDL - Triglycerides/5
Friedewald equation in mg/dL. Error can increase with high triglycerides or nonfasting samples.
Ratio calculations
TC/HDL, LDL/HDL, TG/HDL
Ratios may help compare patterns but are not standalone diagnostic criteria.
Cholesterol Calculation Basis and Limits
Reference date and last reviewed: July 10, 2026
Calculation Basis
Calculates non-HDL cholesterol and the total-to-HDL ratio from total cholesterol, HDL, and triglycerides. When direct LDL is absent and triglycerides are within the supported range, LDL is estimated with the Friedewald equation.
Reference Limits
Calculated LDL is not a direct measurement, and error can increase with high triglycerides or different test conditions. The displayed ranges do not replace laboratory reference ranges or an assessment of individual cardiovascular risk.
When to Confirm Officially
If a result is outside the reference range, or you have diabetes, hypertension, cardiovascular disease, or a relevant family history, do not change medication or diet from this estimate alone. Review the complete lipid panel with a clinician.
Usage Tips
Review lipid panel numbers before a health conversation
Enter total cholesterol, HDL, LDL, and triglycerides to compare non-HDL cholesterol, estimated LDL, and common ratios in one place. Use the result as a reference for understanding a lab report, not as a diagnosis or treatment decision.
What is Cholesterol Calculator?
The Cholesterol Calculator organizes lipid panel values from a health screening or lab report. Enter total cholesterol, HDL, LDL, and triglycerides to review non-HDL cholesterol, conditional estimated LDL, total/HDL ratio, LDL/HDL ratio, and triglyceride/HDL ratio. Results are reference information for understanding a lab report and preparing health questions; they do not diagnose dyslipidemia or replace treatment decisions.
How to Use
- 1Check the unit on your lab report and choose mg/dL or mmol/L.
- 2Enter total cholesterol, HDL, and triglycerides.
- 3If your report includes LDL, enter it directly. If LDL is blank, the calculator estimates LDL only when the sample is fasting and triglycerides are below 400 mg/dL.
- 4Select sex so the low-HDL reference threshold is displayed using the appropriate male or female reference.
- 5Review total cholesterol, LDL, HDL, triglycerides, non-HDL cholesterol, and supporting ratios together.
- 6If results are high, or if you have medical conditions, medication use, family history, smoking, high blood pressure, or diabetes, prioritize professional interpretation and official lab results over this calculator.
How the lipid-panel values are calculated
Last reviewed: July 10, 2026Non-HDL and conditional LDL
non-HDL = total − HDL · LDL = total − HDL − triglycerides÷5
The second expression is the Friedewald estimate in mg/dL. This tool uses it only when direct LDL is blank, fasting is selected, and triglycerides are below 400 mg/dL.
Example: total 198, HDL 52, triglycerides 110 mg/dL
- • Direct LDL left blank
- • Fasting selected
- • All values in mg/dL
- 1. non-HDL = 198 − 52 = 146 mg/dL
- 2. estimated LDL = 198 − 52 − 110÷5 = 124 mg/dL
- 3. total/HDL = 198 ÷ 52 = 3.81
The example produces non-HDL 146 mg/dL and estimated LDL 124 mg/dL. These values alone do not determine treatment.
How to read the result
- If a lab report contains a directly reported LDL value, use it before the calculated estimate.
- Non-HDL subtracts HDL from total cholesterol and includes LDL plus other atherogenic cholesterol.
- Total/HDL, LDL/HDL, and triglyceride/HDL ratios are supporting numbers; this tool does not assign diagnostic cutoffs to them.
Conditions that change the result
- The tool suppresses Friedewald LDL when triglycerides are 400 mg/dL or higher or when nonfasting is selected.
- Friedewald estimates can diverge more from laboratory measurements at low LDL or higher triglyceride levels.
- The mmol/L option uses different conversion factors for cholesterol and triglycerides.
Common input mistakes
- Do not enter mmol/L results while the tool is set to mg/dL or mix units across fields.
- Total cholesterol must be greater than HDL for a meaningful non-HDL result.
- Leaving LDL blank when the report already provides it can hide the more relevant reported value.
Reference Knowledge
- ●Non-HDL cholesterol = total cholesterol - HDL cholesterol. MedlinePlus explains that non-HDL includes LDL and other cholesterol types such as VLDL.
- ●Estimated LDL uses the Friedewald equation in mg/dL: LDL = total cholesterol - HDL - triglycerides/5. The direct LDL value from a lab report takes priority because the estimate can be less appropriate for nonfasting samples or high triglycerides.
- ●General adult reference ranges are displayed from public health references: total cholesterol below 200 mg/dL, LDL below 100 mg/dL, triglycerides below 150 mg/dL, HDL at least 40 mg/dL in men and 50 mg/dL in women, with 60 mg/dL or higher often described as best.
- ●CDC explains that cholesterol testing checks LDL, HDL, triglycerides, and total cholesterol, and that cholesterol management should be considered with age, family history, smoking, diabetes, blood pressure, and other risk factors by a health care professional.
- ●MedlinePlus states that health information should not substitute for professional medical care or advice and that users should contact a health care provider with questions about health.
- ●Reference date: July 10, 2026. If official guidance or lab interpretation methods change, calculation limits and explanatory text should be reviewed together.
FAQ
Q.Can I calculate this without entering LDL?
Yes, if total cholesterol, HDL, and triglycerides are available, the panel is fasting, and triglycerides are below 400 mg/dL. In that case the calculator can estimate LDL with the Friedewald equation. If your lab report includes direct LDL, use that value instead.
Q.Why can my lab-reported LDL differ from the calculated LDL?
Laboratories may use direct LDL measurement or a different estimation method. Nonfasting samples and high triglycerides can also make the Friedewald estimate less reliable. For official interpretation, use the lab report and your health professional's explanation.
Q.Can I use it with a nonfasting test?
You can still organize total cholesterol, HDL, triglycerides, non-HDL cholesterol, and supporting ratios as reference information. If LDL is not entered directly and the test is nonfasting or fasting status is unknown, the calculator does not show an estimated LDL value.
Q.What if my lab report uses mmol/L?
Switch the unit to mmol/L and enter the values exactly as shown on the report. The calculator converts them internally to display common mg/dL reference ranges, but the official lab interpretation and professional explanation should take priority.
Q.Does a high result mean I need treatment?
This calculator cannot decide treatment. Cholesterol management depends on age, blood pressure, smoking, diabetes, family history, existing cardiovascular disease, medication use, and other risk factors. Discuss high results with a health professional.
