Metric & US Conversion

What is the base unit of length in the metric system?

A Meter (m)

How many millimeters are in 1 centimeter?

10 mm

How many centimeters are in 1 meter?

1000 mm

What prefix represents 1/1000 in the metric system?

Milli-

Convert 5.2 meters to centimeters

520 cm

Convert 750 mm to meters

0.75 m

Convert 3.6 cm to mm

36 mm

Convert 0.045 m to mm

125 cm

Convert 1 inch to millimeters

63.5 mm

Convert 10 inches to cm

25.4 cm

Convert 0.75 inches to mm

19.05 mm

Convert 6 inches to mm

152.4 mm

Convert 50 mm to inches

1.969 in

Convert 100 mm to inches

3.937 in

Convert 25.4 mm to inches

1 in

Convert 12.7 mm to inches

0.5 in

Convert 5 mm to inches

0.197 in

Convert 1 pound (lb) to kilograms

0.454 kg

Convert 10 lb to kg

4.54 kg

Convert 2 kg to pounds

4.41 lb

A part measures 3.25 inches. Convert to mm

82.55 mm

A shaft is 100 mm long. Convert to inche

3.937 in

Every conversion follows this pattern:

U.S to Metric : New Value = Original Value x Conversion Factor

If going Metric to U.S you divide instead

What is the Metric equivalent of each:

A) 1 inch =

B) 1 foot =

C) 1 yard =

A) 25.4 mm

B) 0.3048 m

C) 0.9144 m

How to convert:

Inches → Millimeters

Multiply by 25.4

(Example:

2 in × 25.4 = 50.8 mm)

How to Convert?

Inches → Centimeters

Multiply by 2.54

(Example:

5 in × 2.54 = 12.7 cm)

How to Convert?

Feet → Meters

Multiply by 0.3048

(Example:

6 ft × 0.3048 = 1.8288 m)

How to Convert?

Metric → US (reverse it)

Divide instead of multiply

Example:

50 mm ÷ 25.4 = 1.97 in

A) 1 pound (lb) =

B) 1 ounce (oz) =

A) 0.454 kg

B) 28.35 g

How To Convert?

Pounds → Kilograms

Multiply by 0.454

(Example:

10 lb × 0.454 = 4.54 kg)

How to Convert?

Kilograms → Pounds

Multiply by 0.454

(Example:

10 lb × 0.454 = 4.54 kg)

How to convert?

Kilograms → Pounds ( Reverses )

Divide by 0.454

(Example:

5 kg ÷ 0.454 ≈ 11 lb)

1 gallon (US) =

1 fluid ounce =

A) 3.785 liters

B)29.57 mL

How to convvert?

Gallons → Liters

Multiply by 3.785

(Example:

2 gal × 3.785 = 7.57 L)

How to Convert?

Fahrenheit → Celsius

C = (F - 32) x 5/9

(68°F → (68 − 32) × 5/9 = 20°C)

How to Convert?

Celsius → Fahrenheit

F = ( C x 9/5 ) + 32

Mental Shortcuts

1 inch ≈ 25 mm (quick estimate)

1 mm ≈ 0.04 in

1 kg ≈ 2.2 lb

These are great when you don’t need perfect precision.

Reference Chart

U.S METRIC ______________________________________

1 inch (in) = 25.4 mm / 1 mm = 0.039 in

1 inch (in) = 2.54 cm / 1 cm = 0.394 in

1 foot (ft) = 0.3048 m / 1 m = 39.37 in

1 yard (yd) = 0.9144 m / 1 m =3.281 ft

1 mile (mi) = 1.609 km / 1 km = 0.621 mi

1 lb = 0.454 kg / 1 kg = 2.205 lb 1 oz = 28.35 g / 1g = 0.035 oz

1 gallon = 3.785 L

1 quart = 0.946 L

1 pint = 0.473 L

1 fl oz =29.57 mL

Temperature Conversion Formulas

°F → C = (F − 32) × 5/9

__________________________

°C → F = (C × 9/5) + 32