Body Temperature Converter

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Convert body temperature readings between Celsius and Fahrenheit. Normal core body temperature is around 36.5–37.2 °C (97.7–99.0 °F); a fever is generally defined as ≥ 38.0 °C (100.4 °F), and hypothermia begins below 35.0 °C (95.0 °F). Informational only — for any medical decision consult a qualified healthcare professional. Browser-local: nothing is uploaded.

Celsius (°C)
Fahrenheit (°F)

Celsius (°C) → Fahrenheit (°F)

Quick reference table

Celsius (°C)Fahrenheit (°F)
35 °C95 °F
36 °C96.8 °F
36.6 °C97.88 °F
37 °C98.6 °F
37.5 °C99.5 °F
38 °C100.4 °F
38.5 °C101.3 °F
39 °C102.2 °F
40 °C104 °F
41 °C105.8 °F
42 °C107.6 °F

Body temperature reference ranges

Hypothermia: < 35.0 °C / 95.0 °F. Normal: 36.5–37.2 °C / 97.7–99.0 °F. Low-grade fever: 37.3–38.0 °C / 99.1–100.4 °F. Fever: 38.1–39.0 °C / 100.5–102.2 °F. High fever: 39.1–41.0 °C / 102.3–105.8 °F. Hyperpyrexia: > 41.0 °C / 105.8 °F. Thresholds vary by measurement site (oral, rectal, axillary, tympanic, temporal) — always check the device manual. This page is informational only and is not a substitute for medical advice.

Glossary

Celsius (°C)

Celsius is the metric temperature scale where the freezing point of water at standard atmospheric pressure is defined as 0 °C and the boiling point as 100 °C. Introduced by Anders Celsius in 1742 (originally with the scale inverted), it is now the everyday unit in nearly every country, in scientific notation alongside Kelvin, and the dominant unit for weather forecasts outside the US.

Fahrenheit (°F)

Fahrenheit is the imperial temperature scale used in everyday life in the United States, where water freezes at 32 °F and boils at 212 °F. Introduced by Daniel Gabriel Fahrenheit in 1724, the scale was originally calibrated against a brine ice mixture and human body temperature. Convert with F = C × 9/5 + 32 or C = (F − 32) × 5/9.

Normal body temperature

Normal core body temperature in healthy adults ranges roughly 36.5–37.2 °C (97.7–99.0 °F), with the historical "average" of 37.0 °C / 98.6 °F set by Carl Reinhold August Wunderlich in 1868. Modern studies suggest the population mean is closer to 36.6 °C / 97.9 °F. Body temperature naturally varies by ~0.5 °C across the day, with the lowest reading in early morning and the peak in late afternoon.

Fever threshold

Most clinical guidelines define fever as a body temperature ≥ 38.0 °C (100.4 °F) measured rectally or in the ear, ≥ 37.5 °C (99.5 °F) measured orally, or ≥ 37.2 °C (99.0 °F) measured under the arm. High fever begins at 39.0 °C (102.2 °F) and hyperpyrexia at 41.0 °C (105.8 °F). Always check the threshold for the measurement site you are using.

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