“He’s 185cm tall.”

How tall is that?

If you’re American, your brain just went blank.

Here’s the cheat sheet you never knew you needed.

Height (cm → feet)

The quick mental math:

Take the cm number, divide by 30, and that’s roughly feet.

Or just memorize these:

  • 150cm = 4’11” (short)
  • 160cm = 5’3” (below average)
  • 170cm = 5’7” (average woman)
  • 175cm = 5’9” (average)
  • 180cm = 5’11” (tall)
  • 185cm = 6’1” (very tall)
  • 190cm = 6’3” (basketball player)

The Anchors:

  • 180cm ≈ 6 feet
  • Every 2.5cm ≈ 1 inch

Weight (kg → lbs)

The quick mental math:

Double the kg and add 10%.

75kg → 150 + 15 = 165 lbs

Close enough.

Common conversions:

  • 50kg = 110 lbs
  • 60kg = 132 lbs
  • 70kg = 154 lbs
  • 80kg = 176 lbs
  • 90kg = 198 lbs
  • 100kg = 220 lbs

The Anchor:

  • 1kg = 2.2 lbs

Temperature (°C → °F)

The quick mental math:

Double it and add 30.

20°C → 40 + 30 = 70°F

Not exact, but ballpark.

Common conversions:

  • 0°C = 32°F (freezing)
  • 10°C = 50°F (cold)
  • 20°C = 68°F (nice)
  • 25°C = 77°F (warm)
  • 30°C = 86°F (hot)
  • 37°C = 98.6°F (body temp)
  • 40°C = 104°F (very hot)

The Anchors:

  • 0°C = Freezing
  • 20°C = Room temperature
  • 30°C = Hot summer day

Distance (km → miles)

The quick mental math:

Multiply km by 0.6.

10km × 0.6 = 6 miles

Or remember: 5km ≈ 3 miles (a common race distance).

Common conversions:

  • 1km = 0.62 miles
  • 5km = 3.1 miles (5K race)
  • 10km = 6.2 miles
  • 21km = 13.1 miles (half marathon)
  • 42km = 26.2 miles (marathon)
  • 100km = 62 miles

Volume (liters → gallons/cups)

The quick mental math:

1 liter ≈ 4 cups 4 liters ≈ 1 gallon

Common conversions:

  • 250ml = 1 cup
  • 500ml = 2 cups (a pint, roughly)
  • 1L = 4 cups
  • 2L = Half gallon
  • 4L = 1 gallon

Cooking

This is where it actually matters:

  • 250ml = 1 cup
  • 15ml = 1 tablespoon
  • 5ml = 1 teaspoon
  • 225g = 1 cup flour (roughly)
  • 200g = 1 cup sugar (roughly)

Baking by weight (grams) is actually more accurate. Welcome to the metric side.

The Tool

I built Convertly for quick conversions on the go.

13 categories. Instant results. Save your favorites.

Because nobody should have to Google “75kg in pounds” ever again.

— Dolce