Assess your risk based on ADA guidelines and get a personalized action plan
This calculator is based on ADA (American Diabetes Association) risk factors. Over 100 million Americans have diabetes or pre-diabetes, and 1 in 5 don't know they have it. Early detection makes a huge difference — lifestyle changes can prevent or delay Type 2 diabetes in up to 58% of high-risk people.
This is a risk assessment tool, not a diagnosis. A blood glucose test (A1C or fasting glucose) is required to diagnose diabetes or pre-diabetes. Please consult your doctor if you are concerned.
Type 1 diabetes is an autoimmune condition where the body produces no insulin. It typically develops in childhood or early adulthood and requires lifelong insulin therapy. Type 2 diabetes occurs when the body doesn't produce enough insulin or doesn't use it effectively. It's strongly linked to lifestyle factors and accounts for around 90% of all diabetes cases. This calculator assesses risk for Type 2 diabetes.
Common early signs include frequent urination, excessive thirst, unexplained fatigue, blurred vision, slow-healing wounds, frequent infections, and tingling or numbness in hands or feet. Many people with Type 2 diabetes have no symptoms in early stages, which is why risk screening is important — up to 1 in 5 people with diabetes don't know they have it.
Yes — research shows that lifestyle changes can prevent or significantly delay Type 2 diabetes in up to 58% of high-risk individuals. The most effective interventions are losing 5–7% of body weight, exercising at least 150 minutes per week, reducing refined carbohydrate and sugar intake, and stopping smoking. The NHS Diabetes Prevention Programme (UK) and CDC's National Diabetes Prevention Program (US) offer structured support.
Pre-diabetes means your blood sugar levels are higher than normal but not yet high enough to be diagnosed as Type 2 diabetes. Around 1 in 3 adults in the US have pre-diabetes. Without lifestyle changes, pre-diabetes progresses to Type 2 diabetes within 5 years in many cases. The good news is that pre-diabetes is fully reversible with diet, exercise, and weight loss.
Diabetes is diagnosed through blood tests: an A1C test of 6.5% or higher, a fasting blood sugar of 126 mg/dL (7.0 mmol/L) or higher, or a 2-hour blood sugar of 200 mg/dL (11.1 mmol/L) or higher during a glucose tolerance test. Pre-diabetes is diagnosed at A1C 5.7–6.4% or fasting glucose of 100–125 mg/dL. This calculator is a risk screening tool only — not a diagnostic test.
This tool uses the American Diabetes Association (ADA) Type 2 Diabetes Risk Test, a validated screening instrument for identifying undiagnosed or pre-diabetic risk. It assesses non-invasive factors — age, BMI, family history, gestational diabetes history, physical activity, and hypertension — that collectively predict likelihood of having or developing Type 2 diabetes. The test was designed to identify people who should follow up with a blood glucose test, not to diagnose diabetes itself.
Type 2 diabetes develops when cells become resistant to insulin or the pancreas cannot produce enough insulin to maintain normal blood glucose. Risk factors accumulate gradually over years — which is why early screening matters. In the pre-diabetic stage, progression to Type 2 diabetes can often be halted or significantly delayed through lifestyle changes alone.
Low risk — your current profile suggests low likelihood of undiagnosed Type 2 diabetes. Maintain a healthy weight and active lifestyle and reassess annually.
Moderate risk — a fasting blood glucose or HbA1c test is advisable. If results show pre-diabetes, structured lifestyle intervention (5–7% weight loss, 150 minutes of moderate exercise weekly) reduces the conversion rate to Type 2 diabetes by around 58%.
High risk — clinical testing is strongly recommended. This score doesn't diagnose diabetes, but it indicates that a GP appointment and blood test should be a priority.
Risk factors are based on criteria from the NHS and the CDC Diabetes Prevention Program.
Figures are estimates for guidance only. See about this site — how we source data and what these tools can and cannot do.
Type 2 diabetes develops when the body either does not produce enough insulin or cannot use insulin effectively (insulin resistance). Insulin is the hormone that allows cells to absorb glucose from the bloodstream for energy. When this process fails, glucose accumulates in the blood, causing damage to blood vessels, nerves, kidneys, and eyes over time.
Unlike Type 1 diabetes (an autoimmune condition where the pancreas produces no insulin), Type 2 diabetes is strongly influenced by lifestyle factors, though genetic predisposition plays a significant role. Having a first-degree relative with Type 2 diabetes roughly doubles your risk. The condition develops gradually — often there is a preceding phase called pre-diabetes (impaired fasting glucose or impaired glucose tolerance) where blood sugar is elevated but not yet in the diabetic range. This phase can last years and is often reversible with lifestyle changes.
Excess body weight — particularly abdominal fat — is the strongest modifiable risk factor for Type 2 diabetes. Visceral fat (the fat stored around organs in the abdominal cavity) is metabolically active in ways that subcutaneous fat (under the skin) is not: it releases fatty acids and inflammatory signals that impair insulin signalling in the liver and muscle tissue.
BMI of 25–30 (overweight) is associated with a 3× increased risk of Type 2 diabetes compared to healthy weight. BMI above 30 (obese) carries a 7× increased risk. However, BMI does not capture fat distribution — waist circumference is an additional important marker. The National Institute for Health and Care Excellence (NICE) uses waist circumference thresholds of 88cm (35 inches) for women and 102cm (40 inches) for men as high-risk cut-offs for European populations. Lower thresholds apply to South Asian, Chinese, and Black African/Caribbean populations, who tend to develop metabolic complications at lower BMI and waist measurements.
Pre-diabetes is diagnosed by blood tests: fasting glucose of 5.5–6.9 mmol/L (100–125 mg/dL) or HbA1c of 42–47 mmol/mol (6.0–6.4%) in the UK, or 39–47 mmol/mol (5.7–6.4%) using American Diabetes Association criteria. Approximately 7–8% of adults in the UK have pre-diabetes, and many are unaware of it because it causes few or no symptoms.
The landmark US Diabetes Prevention Program trial demonstrated that intensive lifestyle intervention (7% weight loss and 150 minutes of moderate exercise weekly) reduced progression from pre-diabetes to Type 2 diabetes by 58% over 3 years — substantially more effective than the drug metformin, which reduced progression by 31%. The evidence for lifestyle intervention in reversing pre-diabetes is among the strongest in preventive medicine.
Type 2 diabetes often has no obvious symptoms in the early stages — many people are diagnosed incidentally through routine blood tests. When symptoms do occur, they include increased thirst, frequent urination (particularly at night), fatigue, blurred vision, slow wound healing, and recurrent infections. These symptoms reflect the effect of elevated blood glucose on kidneys, circulation, and immune function.
NICE recommends testing for Type 2 diabetes in adults with a BMI above 25 (or 23 for South Asian, Chinese, and Black African/Caribbean populations), those with pre-diabetes, and those with high-risk conditions such as hypertension, polycystic ovary syndrome, or a history of gestational diabetes. In England, the NHS Health Check (offered every 5 years to adults aged 40–74) includes diabetes risk screening.
Risk factors follow the American Diabetes Association (ADA) risk assessment framework and NICE guidelines (NG28). Pre-diabetes diagnostic criteria use UK Diabetes reference ranges. Diabetes Prevention Program results are from the DPP Research Group (NEJM, 2002). Prevalence figures are from NHS Digital and the International Diabetes Federation. This tool is a risk assessment, not a diagnosis — consult your GP for clinical evaluation and blood glucose testing.
Researched and maintained by Iulian, founder of Flux Media Systems. General information, not professional advice — about this site & our sources →