Temperature Converter
Fahrenheit to Celsius
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degrees Celsius (°C)
Celsius to Fahrenheit
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degrees Fahrenheit (°F)
-40° (same!)
0°C / 32°F
20°C / 68°F
30°C / 86°F
100°C / 212°F
Common Temperature Conversions
| Fahrenheit (°F) | Celsius (°C) | Description |
|---|---|---|
| -40°F | -40°C | Same on both scales (only point where they meet) |
| 0°F | -17.8°C | Very cold winter day |
| 32°F | 0°C | Freezing point of water |
| 50°F | 10°C | Cool day in UK |
| 59°F | 15°C | Mild spring/autumn weather |
| 68°F | 20°C | Comfortable room temperature |
| 72°F | 22.2°C | Ideal indoor temperature |
| 77°F | 25°C | Warm summer day in UK |
| 80°F | 26.7°C | Hot day for UK standards |
| 86°F | 30°C | Heatwave conditions in UK |
| 98.6°F | 37°C | Normal human body temperature |
| 104°F | 40°C | Extreme heat / high fever |
| 212°F | 100°C | Boiling point of water at sea level |
Conversion Formulas
°C = (°F - 32) × 5/9
Example: Convert 80°F to Celsius
°C = (80 - 32) × 5/9 = 48 × 0.5556 = 26.67°C
°F = (°C × 9/5) + 32
Example: Convert 25°C to Fahrenheit
°F = (25 × 1.8) + 32 = 45 + 32 = 77°F
Quick Mental Math Tips
- Rough F to C: Subtract 30, then divide by 2 (gives approximate answer)
- Rough C to F: Double the number, then add 30 (gives approximate answer)
- Key benchmark: 16°C = 61°F (easy to remember - reversed digits!)
- Body temp: 37°C = 98.6°F (memorise this for health)
Oven & Cooking Temperature Converter
Convert American recipe temperatures to UK oven settings. UK ovens use Celsius and Gas Marks.
Recipe °F → UK Oven °C
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UK Oven Setting
UK °C → Recipe °F
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American Recipe °F
Standard Oven Temperatures
Very Cool
250°F = 120°C
Gas Mark ½
Cool
275°F = 140°C
Gas Mark 1
Slow
300°F = 150°C
Gas Mark 2
Warm
325°F = 160°C
Gas Mark 3
Moderate
350°F = 180°C
Gas Mark 4
Moderately Hot
375°F = 190°C
Gas Mark 5
Hot
400°F = 200°C
Gas Mark 6
Very Hot
425°F = 220°C
Gas Mark 7
Extremely Hot
450°F = 230°C
Gas Mark 8
Broiling
475°F = 240°C
Gas Mark 9
Complete Oven Temperature Chart
| Description | °F | °C | Gas Mark | Common Uses |
|---|---|---|---|---|
| Very Cool | 225-250°F | 110-120°C | ¼-½ | Drying, warming plates |
| Cool | 275-300°F | 140-150°C | 1-2 | Slow roasting, meringues |
| Warm | 325°F | 160-170°C | 3 | Casseroles, fruit cakes |
| Moderate | 350°F | 175-180°C | 4 | Victoria sponge, biscuits |
| Moderately Hot | 375-400°F | 190-200°C | 5-6 | Pastry, roast chicken |
| Hot | 400-425°F | 200-220°C | 6-7 | Bread, Yorkshire puddings |
| Very Hot | 450-475°F | 230-240°C | 8-9 | Pizza, scones, roast potatoes |
Important Notes for UK Cooks
- Fan ovens run hotter - reduce temperature by 20°C or one Gas Mark
- Electric ovens may need 10-20°C less than gas equivalents
- Always preheat your oven for at least 10-15 minutes
- Use an oven thermometer to check your oven's accuracy
UK Weather Temperature Guide
Understanding Met Office temperature descriptions and what to expect in UK weather.
Freezing
Below 0°C (32°F)
Frost/ice likely. Gritting on roads.
Very Cold
0-5°C (32-41°F)
Winter coat essential. Risk of frost.
Cold
5-10°C (41-50°F)
Typical UK winter day. Layers needed.
Cool/Chilly
10-15°C (50-59°F)
Mild for winter, cool for summer.
Mild
15-18°C (59-64°F)
Pleasant spring/autumn weather.
Warm
18-23°C (64-73°F)
Nice UK summer day. T-shirt weather.
Hot
23-28°C (73-82°F)
Hot for UK. Sun cream advised.
Very Hot / Heatwave
Above 28°C (82°F)
Extreme for UK. Health warnings.
Met Office UK Temperature Reference
| Season | Average Low | Average High | What to Expect |
|---|---|---|---|
| Winter (Dec-Feb) | 1-4°C (34-39°F) | 6-8°C (43-46°F) | Frost, occasional snow, short days |
| Spring (Mar-May) | 4-8°C (39-46°F) | 11-17°C (52-63°F) | Variable, rain showers, warming |
| Summer (Jun-Aug) | 11-14°C (52-57°F) | 19-23°C (66-73°F) | Warmest months, occasional heatwaves |
| Autumn (Sep-Nov) | 7-11°C (45-52°F) | 13-17°C (55-63°F) | Cooling, leaves falling, more rain |
Met Office Heat Health Alerts
| Alert Level | Temperature | Action Required |
|---|---|---|
| Green (Normal) | Below 25°C | Normal conditions - no action needed |
| Yellow (Alert) | 25-27°C | Be prepared, check on vulnerable people |
| Amber (Warning) | 28-32°C | Stay cool, avoid midday sun, keep hydrated |
| Red (Emergency) | Above 32°C | Significant risk to health, stay indoors |
UK Weather Fun Facts
- UK's highest recorded temperature: 40.3°C (104.5°F) in Coningsby, July 2022
- UK's lowest recorded temperature: -27.2°C (-17°F) in Braemar, Scotland
- Average UK annual temperature: approximately 10°C (50°F)
- The UK uses Celsius officially, but many still think in Fahrenheit for hot weather
Body Temperature Guide
Understanding human body temperatures for health monitoring. Based on NHS guidelines.
Convert Body Temperature
Enter a temperature
to see health status
Body Temperature Reference (NHS Guidelines)
Hypothermia
Below 35°C (95°F)
Normal Range
36.1-37.2°C (97-99°F)
Elevated/Fever
37.8-39°C (100-102°F)
High Fever
Above 39°C (102°F)
Complete Body Temperature Reference
| Condition | Celsius | Fahrenheit | NHS Guidance |
|---|---|---|---|
| Severe Hypothermia | Below 28°C | Below 82.4°F | Medical emergency - call 999 |
| Moderate Hypothermia | 28-32°C | 82-90°F | Seek urgent medical care |
| Mild Hypothermia | 32-35°C | 90-95°F | Warm gradually, seek medical advice |
| Low Normal | 35-36°C | 95-97°F | Monitor if feeling unwell |
| Normal Temperature | 36.1-37.2°C | 97-99°F | Healthy range |
| Slightly Elevated | 37.3-37.7°C | 99.1-99.9°F | Not considered fever in adults |
| Low-Grade Fever | 37.8-38.2°C | 100-100.8°F | Rest, stay hydrated |
| Fever | 38.3-39°C | 101-102.2°F | Consider paracetamol, rest |
| High Fever | 39.1-40°C | 102.4-104°F | Seek GP advice, especially children |
| Very High Fever | Above 40°C | Above 104°F | Seek urgent medical help |
When to Seek Medical Help (NHS Guidelines)
- Adults: Fever above 39°C (102.2°F) lasting more than 3 days
- Children 3-36 months: Temperature 39°C (102.2°F) or above
- Babies under 3 months: Temperature 38°C (100.4°F) or above
- Any age: Fever with rash, stiff neck, confusion, or difficulty breathing
- Always call 111 or see GP if concerned about a child's temperature
Temperature Taking Tips
- Digital ear thermometers are most accurate for home use
- Forehead strips are less accurate - use only as a guide
- Oral temperature should be taken under the tongue
- Wait 15-30 minutes after eating or drinking before taking oral temperature
- Normal temperature varies throughout the day - usually lower in morning, higher in evening
All Temperature Scales Converter
Convert between Fahrenheit, Celsius, Kelvin, and Rankine.
Enter Temperature in Any Scale
Temperature Scale Formulas
| Conversion | Formula |
|---|---|
| Celsius to Fahrenheit | °F = (°C × 9/5) + 32 |
| Fahrenheit to Celsius | °C = (°F - 32) × 5/9 |
| Celsius to Kelvin | K = °C + 273.15 |
| Kelvin to Celsius | °C = K - 273.15 |
| Fahrenheit to Kelvin | K = (°F + 459.67) × 5/9 |
| Fahrenheit to Rankine | °R = °F + 459.67 |
| Celsius to Rankine | °R = (°C × 9/5) + 491.67 |
Important Reference Points
| Event | Celsius | Fahrenheit | Kelvin |
|---|---|---|---|
| Absolute Zero | -273.15°C | -459.67°F | 0 K |
| Scales Equal | -40°C | -40°F | 233.15 K |
| Water Freezes | 0°C | 32°F | 273.15 K |
| Room Temperature | 20°C | 68°F | 293.15 K |
| Body Temperature | 37°C | 98.6°F | 310.15 K |
| Water Boils | 100°C | 212°F | 373.15 K |
About Temperature Scales
Celsius (°C): Used worldwide for everyday measurements, including in the UK since 1961. Water freezes at 0° and boils at 100°.
Fahrenheit (°F): Used in the USA and historically in the UK. Water freezes at 32° and boils at 212°.
Kelvin (K): Scientific absolute scale where 0 K is absolute zero (-273.15°C). Used in physics and chemistry.
Rankine (°R): Absolute scale based on Fahrenheit. Rarely used outside engineering in the USA.
Frequently Asked Questions
How do I convert Fahrenheit to Celsius?
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To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature, then multiply by 5/9 (or divide by 1.8). The formula is: °C = (°F - 32) × 5/9. For example, to convert 80°F: (80 - 32) × 5/9 = 48 × 0.5556 = 26.67°C. Our calculator does this automatically for you.
What temperature scale does the UK use?
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The UK officially uses Celsius (°C) as part of the metric system, adopted in 1961. All Met Office weather forecasts, BBC Weather, and official temperature readings are given in Celsius. However, many older Britons still think in Fahrenheit, and American recipes often use Fahrenheit, requiring conversion. UK ovens display both Celsius and Gas Mark settings.
What is 350°F in Celsius for cooking?
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350°F equals approximately 177°C (often rounded to 180°C), which is Gas Mark 4 in UK ovens. This is considered a "moderate" oven temperature and is very common in baking - it's the standard for Victoria sponge, many biscuits, and general baking. If your UK oven is a fan oven, reduce by 20°C to 160°C.
What is normal body temperature in Celsius?
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Normal body temperature is typically 36.1-37.2°C (97-99°F), with 37°C (98.6°F) being the average. According to NHS guidelines, a temperature of 37.8°C (100°F) or above is considered a fever in adults. Normal body temperature varies throughout the day - it's usually lower in the morning and higher in the late afternoon.
What is 80°F in Celsius?
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80°F equals 26.67°C. This would be considered quite hot weather in the UK - warmer than a typical British summer day. In UK weather terms, this would likely trigger amber heat health warnings from the Met Office and would be described as "very warm" or "hot."
At what temperature are Fahrenheit and Celsius the same?
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Fahrenheit and Celsius are equal at exactly -40 degrees. This is the only point where the two temperature scales intersect. So -40°F = -40°C. This extremely cold temperature is rarely experienced in the UK, though parts of Scotland have approached it during severe winters.
What are Gas Marks and how do they relate to temperatures?
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Gas Marks are a UK temperature scale used on gas ovens. Gas Mark 1 is approximately 140°C (275°F), and each Gas Mark increment adds roughly 14°C (25°F). The scale goes from Gas Mark ¼ (about 110°C) to Gas Mark 9 (about 240°C). Most modern UK ovens show both Celsius and Gas Mark settings. Our cooking temperature tab provides a complete conversion chart.
Why does the UK use Celsius but still reference Fahrenheit?
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The UK officially adopted Celsius in 1961 as part of metrication, but Fahrenheit remained in common use for decades. Older generations often learned Fahrenheit in school and still think in it, especially for hot weather (people might say "it's going to be 80 degrees" meaning Fahrenheit). Media sometimes reports both scales, and American recipes, films, and products continue to use Fahrenheit, keeping it familiar to Britons.