# Convert Fahrenheit (°F) & Celsius (°C)

## Convert to Fahrenheit

$\frac{T×9}{5}+32$
• T = Celsius

$\frac{\left(T-32\right)×5}{9}$
• T = Fahrenheit

## Examples

1. Convert 37°C to Fahrenheit.

$\frac{\mathrm{37}×9}{5}+32$

2. Convert 98.6°F to Celsius.

$\frac{\left(98.6-32\right)×5}{9}$

## Medical Relevance

Core temperature
The temperature of the deep tissues of the body—the “core” of the body—remains almost exactly constant, within ±1°F (±0.6°C), day in and day out except when a person febrile illness.
Normal core temperature
The average normal core temperature is generally considered to be between 98.0° and 98.6°F when measured orally and about 1°F higher when measured rectally.
Hyperpyrexia
Occurs between 105—108°F. Circulatory shock, cell destruction and organ failure are followed by death.
Hypothermia
Occurs between 94—77°F. Once the core temperature falls below 85°F temperature regulation is lost. Death by cardiac arrest or ventricular fibrillation occurs once body temperature falls to 77°F.

## Temperature Assessment Sites

• Pulmonary artery (most accurate)
• Esophageal
• Rectal
• Tympanic
• Oral
• Axillary
Reference temperatures
Rectal Oral Tympanic Axillary
37.5 37 36.8 36.4
99.5 98.6 98.2 97.6
Actual average temperatures collected in three clinical studies. Population sizes 7,636, 1,000 and 433.