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Cholesterol Calculator

See what your cholesterol and triglyceride results mean, convert between mg/dL and mmol/L, and work out the total-to-HDL ratio.

Rules last checked 25 October 2026Every step shown

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Total to HDL ratio

5 5 or under is the usual aim

Total cholesterol
Borderline high (5.43 mmol/L)
LDL
Borderline high (3.49 mmol/L)
HDL
Acceptable (1.09 mmol/L)
Triglycerides
Borderline high (1.92 mmol/L)

Total cholesterol is borderline high, LDL borderline high, HDL acceptable and triglycerides borderline high. The total-to-HDL ratio is 5.

How it's worked out

  1. Cholesterol unitsmg/dL ÷ 38.67 = mmol/L5.43 mmol/L
  2. Triglyceride unitsmg/dL ÷ 88.57 = mmol/L1.92 mmol/L
  3. Ratio210 ÷ 425
  • Ranges from the US National Cholesterol Education Program, in mg/dL. Your doctor sets targets from your overall heart risk, which also depends on blood pressure, diabetes, smoking and family history.

The ranges (mg/dL)

Total: under 200 desirable · LDL: under 100 optimal · HDL: 60+ protective · Triglycerides: under 150 normal

Worked example

Total cholesterol of 210 mg/dL (5.43 mmol/L) is borderline high. With an HDL of 42, the ratio is 210 ÷ 42 = 5.

Questions people ask

What is a normal cholesterol level?

Total cholesterol under 200 mg/dL (5.2 mmol/L) is desirable, LDL under 100 mg/dL is optimal, and HDL of 40 mg/dL or more for men (50 for women) is acceptable.

How do I convert cholesterol mg/dL to mmol/L?

Divide by 38.67. For triglycerides, divide by 88.57.

What is the cholesterol ratio?

Total cholesterol divided by HDL. 5 or under is the usual aim; lower is better.

Formula and rules last checked 25 October 2026Written and tested by the CalculatorDex teamReport a problem