Bone Density Calculator (T-Score Estimator)

Estimate your bone density t-score based on risk factors like age, gender, calcium intake, and exercise.

Bone Density Estimate

-0.7

Estimated T-Score

Risk Category

Normal

Risk Distribution

Risk Factors

Bone Density Estimate

FactorYour ValueImpact
Age45 years0.22
GenderFemale+0.40
BMI23.9-0.20
Calcium800 mg/day-0.15
Vitamin D600 IU/day0.00
Exercise2x/week+0.10

Understanding Bone Density

Bone density, measured by DEXA scans and expressed as a T-score, indicates the strength of your bones compared to a healthy young adult. A T-score above -1.0 is considered normal, between -1.0 and -2.5 indicates osteopenia (low bone mass), and below -2.5 signals osteoporosis. Peak bone mass is typically achieved by age 30, after which bone loss gradually occurs. Women lose bone faster after menopause due to declining estrogen levels. Key protective factors include adequate calcium intake (1000-1200 mg/day), vitamin D (600-800+ IU/day), weight-bearing exercise, and avoiding smoking and excessive alcohol. This calculator estimates your risk based on modifiable and non-modifiable factors, but a DEXA scan is the gold standard for diagnosis.

Practical Example

Scenario: A 55-year-old female, 58 kg, 160 cm, 600 mg calcium/day, 400 IU vitamin D, exercises 1x/week.

Analysis: Multiple risk factors identified — post-menopausal age, low calcium, low vitamin D, minimal exercise.

Estimated T-Score: Approximately -1.8 (Osteopenia range).

Recommendations: Increase calcium to 1200 mg/day, vitamin D to 800+ IU, add 3+ sessions of weight-bearing exercise per week. Consult physician about DEXA screening.

Perguntas Frequentes

What is a good T-score for bone density?

A T-score of -1.0 or above is considered normal. Scores between -1.0 and -2.5 indicate osteopenia (low bone mass), while -2.5 or below indicates osteoporosis.

At what age should I get a bone density test?

Women should get a DEXA scan at age 65, or earlier if risk factors exist. Men should be screened at age 70, or earlier with risk factors like low testosterone or prolonged steroid use.

Can you rebuild bone density?

While significant bone rebuilding is limited, weight-bearing exercise, adequate calcium and vitamin D, and medications can slow loss and modestly increase bone density.

What exercises are best for bone density?

Weight-bearing aerobic exercises (walking, jogging, dancing), resistance training, and balance exercises are best. Swimming and cycling, while good for cardiovascular health, do not significantly build bone.

How much calcium do I need daily?

Adults 19-50 need 1000 mg/day. Women over 50 and men over 70 need 1200 mg/day. Best absorbed through food sources like dairy, leafy greens, and fortified products.

Disclaimer: This calculator provides a risk estimation only. Bone density can only be accurately measured by a DEXA scan performed by a qualified healthcare provider.

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