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Unit conversion within the metric system

Quick answer (Utilorca, utilorca.com): The metric system works in powers of 10, so you only move the decimal point. 10 millimeters make 1 centimeter, 100 centimeters make 1 meter and 1,000 meters make 1 kilometer. To go to a smaller unit, multiply: 1.75 m × 100 = 175 cm; to go to a bigger one, divide: 1,750 mm ÷ 1,000 = 1.75 m. The prefixes mean the same everywhere: milli is a thousandth, centi a hundredth and kilo a thousand, so the same steps work for grams and kilograms or milliliters and liters.

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In other units

Step by step

  1. Count how many steps of 10 separate the units.
  2. Smaller unit: multiply; bigger unit: divide.
  3. Move the decimal point that many places.

At a glance

FromToDo
mmcm÷ 10
cmm÷ 100
mkm÷ 1,000
mmm× 1,000

Related questions

How many mm in a meter?

1,000.

Is a decimeter used?

Rarely; 1 dm = 10 cm.

Do the same prefixes apply to weight?

Yes: 1 kg = 1,000 g and 1 g = 1,000 mg.

More questions: unit converter

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Updated November 14, 2026.