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Cholesterol Ratio Calculator
Work out your total-to-HDL cholesterol ratio, non-HDL cholesterol, LDL/HDL and triglyceride/HDL ratios, in mg/dL or mmol/L.
Enter the numbers from your lipid profile, total cholesterol and HDL cholesterol, plus LDL and triglycerides if you have them, and the calculator works out the ratios doctors use to judge heart risk: total cholesterol divided by HDL, non-HDL cholesterol, LDL divided by HDL and triglycerides divided by HDL. If your report has no LDL, it is estimated with the Friedewald formula.
Values can be entered in mg/dL, used in the US and India, or mmol/L, used in the UK, Europe, Canada and Australia; switching the unit converts what you typed. A colour scale shows where your total-to-HDL ratio falls, and a table lists the usual desirable levels.
How to use Cholesterol Ratio Calculator
- Choose mg/dL or mmol/L, as on your report.
- Enter total cholesterol and HDL cholesterol.
- Add LDL and triglycerides if you have them; LDL is estimated if left empty.
- Read the ratios and compare with the guidance table.
Features
- Total ÷ HDL ratio with a colour scale
- Non-HDL cholesterol
- LDL ÷ HDL and triglycerides ÷ HDL
- LDL estimated by the Friedewald formula when missing
- mg/dL and mmol/L with conversion
- Runs in your browser; nothing is stored or sent
The ratios explained
HDL is often called good cholesterol because it carries cholesterol away from the arteries, while LDL and other non-HDL particles deposit it in artery walls. Comparing them in a ratio says more than total cholesterol alone: two people with a total of 200 mg/dL have very different risk if one has an HDL of 70 and the other of 35. For a total of 200 mg/dL, HDL of 50 and triglycerides of 150, the total-to-HDL ratio is 4.0, non-HDL cholesterol is 150 mg/dL, estimated LDL is 120 mg/dL, LDL-to-HDL is 2.4 and triglycerides-to-HDL is 3.0.
| Measure | How it is worked out | Usually desirable |
|---|---|---|
| Total ÷ HDL | Total cholesterol ÷ HDL | Under 5, ideally under 3.5 |
| Non-HDL cholesterol | Total − HDL | Under 130 mg/dL (3.4 mmol/L) |
| LDL ÷ HDL | LDL ÷ HDL | Under 3 |
| Triglycerides ÷ HDL | TG ÷ HDL, both in mg/dL | Under 2 |
Estimating LDL
Many labs calculate LDL rather than measure it. The classic Friedewald formula is LDL = total cholesterol − HDL − triglycerides ÷ 5 in mg/dL, or triglycerides ÷ 2.2 in mmol/L. It is not valid when triglycerides are 400 mg/dL (4.5 mmol/L) or higher, and it underestimates LDL when LDL is very low or triglycerides are high; newer formulas such as Martin-Hopkins or Sampson correct this, so your lab's LDL may differ slightly. If your report gives a measured LDL, enter it and it is used instead.
Units: mg/dL and mmol/L
To convert cholesterol (total, HDL, LDL) from mmol/L to mg/dL, multiply by 38.67; for triglycerides multiply by 88.57. A total cholesterol of 5.2 mmol/L is about 201 mg/dL, and triglycerides of 1.7 mmol/L are about 151 mg/dL. Ratios of cholesterol to cholesterol are the same in either unit, but the triglyceride-to-HDL ratio is normally quoted with both values in mg/dL.
What affects your numbers
Cholesterol depends on genes as well as lifestyle. Saturated and trans fats raise LDL; regular exercise, not smoking and losing excess weight raise HDL and lower triglycerides; sugary drinks, refined carbohydrates and alcohol raise triglycerides. Triglycerides are much higher after a meal, which is why some tests ask you to fast. Thyroid problems, diabetes, kidney disease and some medicines also change lipid levels.
Ratios and heart risk
Ratios are one part of the picture. Doctors estimate heart and stroke risk with tools that combine cholesterol with age, sex, blood pressure, diabetes, smoking and family history, and they set LDL or non-HDL targets from that overall risk. People who already have heart disease or diabetes often have much lower targets than those in the table. Use the calculator to understand your report, and ask your doctor what your own targets should be.
Frequently asked questions
What is a good cholesterol ratio?
A total-to-HDL ratio under 5 is generally acceptable and under 3.5 is ideal. Your doctor may set a different goal from your overall heart risk.
How do I calculate the cholesterol ratio?
Divide total cholesterol by HDL cholesterol. For example, 200 ÷ 50 = 4.0.
What is non-HDL cholesterol?
Total cholesterol minus HDL: all the cholesterol carried by particles that can clog arteries. Under 130 mg/dL (3.4 mmol/L) is usually desirable.
Can I calculate LDL myself?
Yes, with the Friedewald formula if triglycerides are under 400 mg/dL: total − HDL − triglycerides ÷ 5 (mg/dL). Leave LDL empty and the calculator estimates it.
Which units should I use?
The ones on your lab report: mg/dL in the US and India, mmol/L in the UK, Europe, Canada and Australia.
Is my data saved?
No. Everything is calculated in your browser.
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