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Common conversions — quick lookup

The 50 most-searched one-answer conversions. Type what you'd type into Google, get the answer, move on.

1 US cup = 236.6 ml
Metric cup = 250 ml, UK cup = 284 ml.
Cooking
1 US stick butter = 113 g = 8 tbsp = ½ cup
European butter comes in 250 g bars.
Cooking
1 US tbsp = 14.79 ml
UK tbsp = 17.76 ml. Australian tbsp = 20 ml.
Cooking
1 US tsp = 4.93 ml
3 tsp = 1 tbsp.
Cooking
1 cup all-purpose flour = 120 g
Spoon-and-level. Scooped can hit 150 g.
Cooking
1 cup granulated sugar = 200 g
Brown sugar (packed) = 213 g/cup.
Cooking
1 US large egg = 50 g (shell on ~57 g)
White 33 g, yolk 17 g.
Cooking
350°F = 175°C (moderate oven)
Gas mark 4. Most cakes and casseroles.
Cooking
400°F = 200°C (hot oven)
Gas mark 6. Roasted chicken and vegetables.
Cooking
180°C = 356°F (moderate oven)
Gas mark 4. Cakes, brownies, cookies.
Cooking
Chicken safe temp: 74°C / 165°F (ground), 71°C / 160°F (whole cuts)
USDA safe-cooked threshold.
Cooking
37°C / 98.6°F (oral, average)
Modern studies show 36.6°C / 97.9°F is more accurate.
Body
Fever starts at 38°C / 100.4°F
Moderate = 39°C. High = 40°C. Emergency = 42°C.
Body
5'10" = 177.8 cm
Each inch is 2.54 cm exactly.
Body
5'6" = 167.6 cm
Body
6'0" = 182.9 cm
Body
150 lb = 68.04 kg
Divide pounds by 2.205 to get kilograms.
Body
200 lb = 90.72 kg
Body
BMI = weight (kg) / height (m)²
Normal 18.5–24.9. Overweight 25–29.9. Obese 30+.
Body
100 km/h = 62.1 mph
Multiply km/h by 0.621 for mph.
Travel
60 mph = 96.6 km/h
Multiply mph by 1.609 for km/h.
Travel
23 kg = 50.7 lb
Standard checked-bag allowance.
Travel
7 kg = 15.4 lb
Typical carry-on weight limit.
Travel
Marathon = 42.195 km = 26.22 mi
Half marathon = 21.1 km.
Fitness
5 km = 3.11 mi
Standard fun-run distance.
Fitness
1 US gallon = 3.785 L
1 UK gallon = 4.546 L.
Travel
30 MPG (US) = 7.84 L/100km
Use 235.2 / MPG = L/100km.
Travel
1 acre = 43,560 ft² = 4,047 m²
≈ 75% of an NFL football field.
Home
1 hectare = 2.471 acres = 10,000 m²
Home
1 m² = 10.76 ft²
Easier to memorize: m² × 10.76 = ft².
Home
1 HP (mechanical) = 745.7 W
Metric HP (PS) = 735.5 W.
Tech
1 kWh = 3.6 MJ = 3,600,000 J
= 860 kcal (food Calories).
Tech
1 GB = 1,000 MB (decimal) or 1,024 MB (binary)
Binary = GiB. Phone storage uses decimal.
Tech
Whisper ≈ 30 dB. Normal conversation 60 dB. Jet engine 140 dB.
Sound doubles in pressure every 6 dB.
Tech
Speed of sound at sea level = 343 m/s = 1,235 km/h = 767 mph
Mach 1 varies with altitude and temperature.
Tech
30 PSI = 2.07 bar
1 bar ≈ 14.5 PSI. European cars often list bar.
Travel
1 ft = 0.3048 m exactly
m × 3.281 = ft.
Home
1 inch = 2.54 cm exactly
Home
1 yard = 0.9144 m
3 feet = 1 yard.
Home
1 mile = 1.609 km exactly
mi × 1.609 = km.
Travel
1 nautical mile = 1.852 km. 1 knot = 1 nm/h = 1.852 km/h
Based on 1 arcminute of latitude.
Travel

41 results. Need precise math? Use a dedicated converter — this is a quick-reference card.

When to use this page vs a full converter

Use this page when the question has one answer: "1 US cup in ml" will always be 236.6 ml, regardless of whether you want 1, 2, or 17.5 of them. Use a full converter when the input is variable: "125 grams of flour in cups," "47 mph in km/h," "250 pounds in kilograms."

Both paths exist because they solve different problems. Converters involve two selections (from-unit and to-unit) plus a number. Lookups involve typing a phrase. For the dozen or so conversions a person actually needs a dozen times a year, the lookup saves clicks. For everything else, go to the converter.

The six categories and why they dominate search

Cooking (about 40% of lookup traffic)

Cup/tbsp/tsp in milliliters, oven temperature conversions, safe meat temperatures, butter stick weights. All single-fact, all frequently looked up mid-recipe with flour on hands. If you cook once a week, you hit this category at least once every other week.

Body & health (~20%)

Height in cm, weight in kg, fever threshold. Often searched before a doctor's appointment ("my height is 5'10 — what's that in cm?") or for an online form that demands metric when you grew up imperial.

Travel (~15%)

mph/kph, mile/km, baggage kg/lb, US gallon vs UK gallon, tire pressure PSI/bar. The search volume here correlates with summer travel season and with the release dates of new pickup trucks.

Fitness (~10%)

Marathon in km, 5k in miles, pace in min/km vs min/mi. Spike around registration periods for big races (January–March).

Home & real estate (~10%)

Feet to meters, acre to sq ft, hectare to acres, m² to ft². Searched by anyone pricing a house, planning a garden, or laying carpet.

Tech (~5%)

GB to MB, watts to horsepower, kWh to joules. Smaller volume but extremely "right answer matters" — a confused GB/MB answer can drive a bad phone-plan decision.

A few facts this page clarifies

  • A "calorie" on a food label is a kilocalorie. The chemistry calorie is 1/1000 as much. So when a Snickers bar says "250 Calories," it's actually 250,000 chemistry calories.
  • Normal body temperature has drifted. The classic 98.6°F / 37°C was set in 1868. Modern studies (JAMA 2020) average 97.9°F / 36.6°C. A fever starts at 100.4°F / 38°C.
  • MPG and L/100km don't scale linearly. A car going from 15 to 20 MPG saves more fuel per mile than one going from 40 to 45 MPG, even though both are "+5 MPG." Use L/100km to see it.
  • GB vs GiB. Phone and drive manufacturers use decimal GB (1 GB = 10⁹ bytes). Operating systems often report binary GiB (1 GiB = 2³⁰ bytes). That's why a "256 GB" drive looks like 238 GB in Windows.

Related tools

Frequently Asked Questions

Because most of the time you don't need math — you need a fact. 'How many ml in a cup' has one answer, not a calculator. This page is a searchable memory of the 50 most-googled single-answer conversions. It saves you picking a tool, choosing units, and typing a value when all you really wanted was 'oh yes, 236.6 ml.'