Heart health
Cholesterol Ratio UK: What Is a Good Total-to-HDL Ratio?
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed July 20267 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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Your cholesterol ratio is your total cholesterol divided by your HDL (“good”) cholesterol. A lower number is better. HEART UK regards a ratio under 4 as healthy and one above 6 as high risk. It sits on a standard cholesterol blood test, and reading it alongside your other lipids gives a fuller picture than total cholesterol on its own.
A total cholesterol number on its own can mislead. Two people can share the same total and carry very different heart risk, because it matters how that cholesterol is split between the harmful and the protective kinds.
The cholesterol ratio captures that split in a single figure. This guide explains what it is, what a good ratio looks like in the UK, and how to work yours out.
As of July 2026.
1. What is the cholesterol ratio?
The cholesterol ratio is a simple sum. You divide your total cholesterol by your HDL cholesterol. If your total is 5.0 mmol/L and your HDL is 1.25 mmol/L, your ratio is 4.
HDL is the “good” cholesterol. It helps carry cholesterol away from the artery walls and back to the liver. A higher HDL pulls the ratio down, which is why the number rewards protective cholesterol rather than just counting the total.
Most UK lab reports print this figure for you, often labelled “TC:HDL” or “cholesterol/HDL ratio”. A lower number is better.
2. What is a good cholesterol ratio?
There is no single official target, but UK guidance points in a clear direction. HEART UK regards a ratio under 4 as a sign of healthy cholesterol, and a ratio above 6 as representing a high risk of heart disease. The lower the figure, the better.
- Under 4: generally regarded as healthy.
- 4 to 6: a middle band worth improving, especially with other risk factors.
- Above 6: a marker of higher heart-disease risk, worth a conversation with a clinician.
These are general reference points, not a diagnosis. Your ratio is one input among several, and what it means for you depends on the rest of your health, not the number alone.
3. Why the ratio can beat total cholesterol alone
Total cholesterol lumps together the harmful and protective kinds. A person with a high total driven by high HDL can be at lower risk than a person with a “normal” total and very little HDL. The ratio separates those two people, because it weighs the total against the protective part.
“Individuals had higher cardiovascular mortality with a TC/HDL-C ratio >4.22.”
— Frontiers in Cardiovascular Medicine, 2022 (general-population cohort)
The ratio is a useful summary, but it is not the last word. In 2023 NICE shifted its emphasis toward non-HDL cholesterol for UK risk assessment. The fuller cholesterol blood test guide sets the ratio next to LDL, HDL and triglycerides.
4. How to improve your cholesterol ratio
You can lower the ratio from both ends: by nudging total cholesterol down and by lifting HDL. The habits that help are the familiar ones, and they tend to move both numbers.
- Regular activity, which can raise HDL over time.
- Swapping saturated fat for unsaturated fats, such as olive oil, nuts and oily fish.
- More soluble fibre, from oats, beans and pulses.
- Stopping smoking, which lowers HDL while you do it.
Diet and lifestyle may support a healthier balance. For some people, medication such as a statin is the right step, and that is a decision for your GP. Our guide on how to lower cholesterol goes further.
5. How to check your cholesterol ratio
The ratio comes from a standard lipid profile, so any cholesterol blood test that reports total cholesterol and HDL will give it to you. You do not usually need to fast for it. On the NHS you may be offered a check as part of an NHS Health Check or if you have risk factors.
Privately, the ratio is included whenever a panel measures total cholesterol and HDL together. A home finger-prick kit can report it alongside LDL, triglycerides and non-HDL cholesterol. Whatever the figure, what it means for you is a conversation for a qualified clinician.
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6. Frequently asked questions
What is a good cholesterol ratio?
HEART UK regards a ratio under 4 as a sign of healthy cholesterol and a ratio above 6 as high risk. The lower the number, the better. It is one input among several, so read it with the rest of your results.
How do you calculate the cholesterol ratio?
Divide your total cholesterol by your HDL cholesterol. A total of 5.0 mmol/L with an HDL of 1.25 mmol/L gives a ratio of 4. Most UK lab reports work it out for you.
Is the cholesterol ratio better than total cholesterol?
It adds useful context, because it weighs the total against your protective HDL rather than counting cholesterol as one lump. In 2023 NICE shifted its UK emphasis toward non-HDL cholesterol, so the ratio is best read as part of the wider picture.
Do I need to fast before a cholesterol ratio test?
Usually no. Total cholesterol and HDL, the two figures that make the ratio, are not greatly affected by a recent meal. Follow the instructions that come with your specific test.
How can I improve my cholesterol ratio?
Regular activity, swapping saturated for unsaturated fats, more soluble fibre and stopping smoking can all help move the ratio in the right direction. For some people, medication is the right step, which is a decision for your GP.