English how-to · updated 2026
A daily weather and cooking search — the formula people re-type every winter. This page has 50 important questions and answers. Original explainer for daily search — not a government login or live tracker.
To convert Celsius to Fahrenheit: multiply by 9/5 (or 1.8), then add 32. So F = C × 1.8 + 32. The other way: C = (F − 32) × 5/9. Water freezes at 0°C / 32°F and boils at 100°C / 212°F at standard pressure.
Body-temperature talk: 37°C is about 98.6°F (an old average, not a law). A kitchen oven at 180°C is 356°F. Weather apps in the US default to °F; most of the world uses °C.
Do not mix the formulas. Adding 32 first and then multiplying gives a wrong cooking temperature — a common phone-calculator mistake.
50 important questions. Quick 10 is a random set; Full set plays every question.
Original explainers for English readers — not copied match reports or official papers. Tap a question to see the answer.
Answer: F = C × 1.8 + 32
0°C → 32°F.
Answer: C = (F − 32) × 5/9
32°F → 0°C.
Answer: 0°C and 32°F
Same physical point, two scales.
Answer: 100°C / 212°F
Altitude changes the boil a little.
Answer: 98.6°F
It is a textbook average, not every healthy person.
Answer: 356°F
1.8 × 180 + 32 = 356.
Answer: adding 32 before multiplying
Order matters.
Answer: the same scale as Fahrenheit
US media still quote °F.
Answer: 50°F
10 × 1.8 + 32 = 50.
Answer: 68°F
20 × 1.8 + 32 = 68.
Answer: 77°F
A common roomy indoor target in some homes.
Answer: 86°F
30 × 1.8 + 32 = 86.
Answer: 104°F
Heat-wave talk in °C; US headlines use °F.
Answer: 14°F
Negative C still gets ×1.8 then +32.
Answer: the same number on both scales
−40°C = −40°F.
Answer: 10°C
(50 − 32) × 5/9 = 10.
Answer: 21°C
(70 − 32) × 5/9 ≈ 21.1.
Answer: 27°C
A warm US summer afternoon for many towns.
Answer: 32°C
(90 − 32) × 5/9 = 32.
Answer: 37°C
Healthy people scatter around it.
Answer: 100°C at standard boil
Same kettle, two labels.
Answer: 0°C
Ice on the pond.
Answer: 320°F
1.8 × 160 + 32 = 320.
Answer: 392°F
1.8 × 200 + 32 = 392.
Answer: 428°F
Hot pizza-ish territory on many boxes.
Answer: another scale — still convert the printed °C/°F on the recipe
Do not guess from “mark 6” without a chart.
Answer: 18°F
Differences: multiply by 1.8 only (no +32).
Answer: 9°F
Deltas skip the +32.
Answer: 100.4°F
Fever talk uses both in different countries.
Answer: 39°F
Food-safety bands are often written in one scale.
Answer: 0°F
That is a common food-freezer target.
Answer: Celsius + 273.15, not Fahrenheit
Science papers use K.
Answer: 0 K, about −273°C, not 0°F
Do not mix kitchen scales with kelvin.
Answer: freezing, not a warm 32°C day
Tourists mix this every winter.
Answer: about 90°F — hot for many cities
Same number, opposite comfort.
Answer: a rough °F guess, not exam-perfect
10°C → about 50; exact is 50 anyway.
Answer: rough, not (F − 32) × 5/9
Use the real formula for medicine and ovens.
Answer: a huge wrong oven-like number
Order: multiply first.
Answer: control your weather app’s default scale
Change °C/°F in the phone settings.
Answer: 165°F
Food-safety charts pick the scale they print.
Answer: how cold it feels, still quoted in °C or °F
The formula on this page is for actual air temperature.
Answer: humidity-adjusted, not a new conversion of 1.8
Convert the real thermometer first.
Answer: about safety, not a single magic °F on this quiz
Use a bath thermometer the paediatric nurse named.
Answer: can disagree; the scale is only one issue
Follow the device you have.
Answer: 38°C
(100 − 32) × 5/9 ≈ 37.8.
Answer: −18°C
(0 − 32) × 5/9 ≈ −17.8.
Answer: read as if the number were °F
36°C is not a mild 36°F.
Answer: 104–113°F, not 40°F
Temper charts use precise °C.
Answer: change what your oven dial prints
If the dial is unmarked, use an oven thermometer.
Answer: 1.8°F, not 1°F
Deltas never add 32.
Pick the next article in this topic — that is how a magazine issue is meant to be used.
