billycalc

FAST/BEFAST

FAST/BEFAST: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.

ℹ Reference calculation based on the published method. It does not replace a clinical examination or a doctor's decision.

FAST/BEFAST

B — loss of balance/coordination (1 = yes)
E — sudden vision loss (1 = yes)
F — facial droop (1 = yes)
A — arm weakness (1 = yes)
S — speech difficulty (1 = yes)
Positive BE-FAST signs
0
T — note the time of symptom onsetFAST/BEFAST: calculated with the published clinical method, with result interpretation. A reference tool that does not replace a doctor's advice.
Suspected stroke
No signs detected

More about: FAST/BEFAST

What it calculates

The “FAST/BEFAST” calculator computes Positive BE-FAST signs from 5 parameters: b — loss of balance/coordination (1 = yes), e — sudden vision loss (1 = yes), f — facial droop (1 = yes), a — arm weakness (1 = yes), s — speech difficulty (1 = yes).

Used by professionals and patients to assess health metrics, dosages, and risks.

Example calculation

With parameters B — loss of balance/coordination (1 = yes) = 0, E — sudden vision loss (1 = yes) = 0, F — facial droop (1 = yes) = 0, A — arm weakness (1 = yes) = 0, S — speech difficulty (1 = yes) = 0 the result is 0 (T — note the time of symptom onset).

How to use

  1. Enter b — loss of balance/coordination (1 = yes), e — sudden vision loss (1 = yes), f — facial droop (1 = yes), a — arm weakness (1 = yes) and s — speech difficulty (1 = yes) — each field above is adjustable with a slider.
  2. Positive BE-FAST signs is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is BMI calculated?
BMI = weight (kg) / height (m)². Example: 70 kg / (1.75 m)² = 22.9. The WHO normal range is 18.5–24.9; below that is underweight, 25–29.9 is overweight, and 30+ is obese.
Is BMI accurate for everyone?
No. BMI does not distinguish muscle from fat, so athletes may show a high BMI with low body fat. It is also less reliable for teenagers, pregnant people, older adults, and very tall or short individuals.
What are the BMI categories?
Underweight: below 18.5. Normal: 18.5–24.9. Overweight: 25–29.9. Obese class I: 30–34.9; class II: 35–39.9; class III: 40+.
What is a better measure than BMI?
Body fat percentage, waist-to-height ratio (aim for under 0.5), and waist circumference give a clearer picture of health than BMI alone.

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