Fahrenheit to Celsius Converter
Convert Fahrenheit to Celsius instantly. Free temperature converter with formula, chart and common conversions (32°F=0°C, 72°F=22°C). Quick & accurate.
Last updated: February 2026
Fahrenheit to Celsius Converter UK 2025
Quick Formula
°C = (°F - 32) × 5/9
32°F = 0°C | 68°F = 20°C | 80°F = 26.7°C | 100°F = 37.8°C
Popular Temperature Conversions
Convert between Fahrenheit and Celsius instantly. Includes UK weather temperatures, cooking conversions, and body temperature guide.
Temperature Converter
Fahrenheit to Celsius
Celsius to Fahrenheit
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
Example: Convert 80°F to Celsius
°C = (80 - 32) × 5/9 = 48 × 0.5556 = 26.67°C
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
UK °C → Recipe °F
Standard Oven Temperatures
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.
Frost/ice likely. Gritting on roads.
Winter coat essential. Risk of frost.
Typical UK winter day. Layers needed.
Mild for winter, cool for summer.
Pleasant spring/autumn weather.
Nice UK summer day. T-shirt weather.
Hot for UK. Sun cream advised.
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
Body Temperature Reference (NHS Guidelines)
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.
How to Convert Fahrenheit to Celsius
This converter provides instant, accurate results for your measurement conversions. The UK uses a mix of metric and imperial measurements in daily life, which can make conversions a frequent necessity. Road signs use miles, food is sold in grams and kilograms, and height is often quoted in feet and inches despite the metric system being the official standard.
Understanding the conversion formula helps verify results and perform quick mental calculations when a tool is not available.
Key Information
Common UK conversion factors: 1 inch = 2.54 cm, 1 foot = 30.48 cm, 1 mile = 1.609 km, 1 pound (lb) = 0.4536 kg, 1 stone = 6.35 kg, 1 pint (UK) = 568 ml, 1 gallon (UK) = 4.546 litres, 1 acre = 0.4047 hectares. Temperature conversions use the formula: Celsius = (Fahrenheit - 32) x 5/9.
Example Calculation
To convert 5 feet 10 inches to centimetres: first convert to total inches (5 x 12 + 10 = 70 inches), then multiply by 2.54 to get 177.8 cm. For weight, a person weighing 12 stone 7 lbs is 12.5 stone, which equals 79.4 kg (12.5 x 6.35).
Source: Based on international measurement standards. Last updated March 2026.
Frequently Asked Questions
Last updated: February 2026 | Verified with latest UK rates
Pro Tips for Accurate Results
- Double-check your input values before calculating
- Use the correct unit format (metric or imperial)
- For complex calculations, break them into smaller steps
- Bookmark this page for quick future access
Understanding Your Results
Our Fahrenheit To Celsius provides:
- Instant calculations - Results appear immediately
- Accurate formulas - Based on official UK standards
- Clear explanations - Understand how results are derived
- 2025/26 updated - Using current rates and regulations
Common Questions
Is this calculator free?
Yes, all our calculators are 100% free to use with no registration required.
Are the results accurate?
Our calculators use verified formulas and are regularly updated for accuracy.
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