Discover your biological age using the Klemera-Doubal method
Upload one or more PDFs/images of your lab results to auto-fill values
Note: PDF extraction may have errors. Please double-check the extracted values before calculating.
Each biomarker tells a story about your health. Learn what they mean and how to optimize them.
A protein made by the liver. It keeps fluid in your bloodstream and carries hormones, vitamins, and enzymes throughout your body.
Optimal: 3.5 - 5.5 g/dL
↑ Adequate protein intake, good liver function, low chronic inflammation, and good hydration status
↓ Low protein intake, chronic inflammation, excessive alcohol consumption, poor sleep, or significant physical stress
An enzyme found in the liver, bones, kidneys, and digestive system. Reflects liver and bone metabolic activity.
Optimal: 44 - 147 U/L (adults)
↑ Alcohol consumption, high-fat diet, excess body weight, certain medications, or high bone turnover from sedentary lifestyle
↓ Low zinc intake, very low calorie intake, or hypothyroidism — in otherwise healthy people, low-normal ALP often reflects good liver health and low inflammation
A waste product from normal muscle metabolism. Your kidneys filter it out of your blood — it reflects both muscle mass and kidney filtration efficiency.
Optimal: 0.6 - 1.2 mg/dL (varies by muscle mass and sex)
↑ Dehydration, very high protein or red meat intake, intense recent exercise, or reduced kidney filtration efficiency
↓ Low muscle mass, low meat intake, or creatine supplementation (which paradoxically reduces creatinine by improving muscle creatine retention)
Measures your average blood sugar over the past 2-3 months. Reflects how well your body is regulating glucose over time.
Optimal: Below 5.7%
↑ High refined carbohydrate or sugar intake, sedentary lifestyle, poor sleep, chronic stress, or excess body weight — all of which reduce insulin sensitivity
↓ Good long-term blood sugar control driven by regular exercise, balanced diet, healthy weight, and good sleep quality
A marker of inflammation produced by the liver. Reflects the level of chronic low-grade inflammation in your body.
Optimal: Below 1.0 mg/L
↑ Excess body fat, processed food diet, high sugar intake, poor sleep, chronic stress, smoking, sedentary lifestyle, or recent intense exercise
↓ Regular physical activity, anti-inflammatory diet rich in omega-3s and polyphenols, healthy body weight, good sleep quality, and low stress
Measures the total number of immune cells circulating in your blood. Reflects your immune system's baseline activation level.
Optimal: 4.5 - 11.0 × 10³/µL
↑ Chronic inflammation, smoking, obesity, high stress, sedentary lifestyle, or poor sleep — all of which keep the immune system in a persistently activated state
↓ Regular exercise, low chronic inflammation, healthy body weight, good sleep, and non-smoking status — low-normal WBC in healthy people reflects a calm, efficient immune system
Measures the average size of your red blood cells. Reflects the quality and consistency of red blood cell production in your bone marrow.
Optimal: 80 - 100 fL
↑ Excess alcohol consumption, low B12 intake (common in vegetarians/vegans), low folate intake, or poor nutrient absorption
↓ Low iron intake, poor iron absorption, or very high endurance training volume which increases iron demand
Measures the variation in size among your red blood cells. Lower variation means your bone marrow is producing consistent, healthy red blood cells.
Optimal: 11.5 - 14.5%
↑ Nutritional deficiencies (iron, B12, folate), oxidative stress, poor sleep, chronic inflammation, or excessive alcohol — all of which impair consistent red blood cell production
↓ Good nutritional status, low oxidative stress, low inflammation, and efficient bone marrow function
Lymphocytes are the immune cells responsible for fighting viral infections and producing antibodies. This measures their share of your total white blood cell count.
Optimal: 20 - 40% (athletes may naturally run 40-50%)
↑ Regular exercise — which chronically elevates lymphocyte percentage as a sign of healthy immune activity. In active individuals, values of 40-50% are common and reflect good immune fitness
↓ Chronic stress, poor sleep, sedentary lifestyle, smoking, or aging-related immune decline — all of which suppress lymphocyte production and activity
Biological age reflects how well your body is functioning compared to others your chronological age. Unlike chronological age (years since birth), biological age can be influenced by lifestyle, diet, exercise, and other factors.
This calculator uses the Klemera-Doubal Method (KDM) , a scientifically validated approach that estimates biological age by analyzing how your biomarkers compare to age-related changes observed in a large reference population.
Biological < Chronological
Aging slower
Biological ≈ Chronological
Typical pace
Biological > Chronological
Consider changes
Built with R Shiny and the BioAge package. For educational purposes only.
Upload multiple lab reports from different dates to visualize how your biological age changes over time.
Note: Each file should be from a different date. The app will extract the test date from each report.
Compare your chronological age (dashed line) with your biological age (solid line). The shaded area shows the gap - green means you're aging slower, orange means faster. Labels show the exact difference.
Green = reducing biological age, Orange = adding years. ⚠️ Underlined = unusual value (>2 SD from your average).