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## How do u convert between the metric system and the english system

• Converting 4.92in to mm

For quick conversions you can use google or some other unit converter. Otherwise, if you need to show work or if you need practice, use dimensional analysis. In other words, multiply your number 4.92 inches times the converting factors needed. You can go step by step, converting from inches to centimeters and then centimeters to millimeters.

the converting factors are as follows:

1 inch = 2.54 cm,   or      2.54 cm/1 inch = 1,       or  1 inch/2.54 cm = 1
1 cm = 100 mm, or          1 cm/100mm = 1,         or  100mm/1cm = 1

you can use conversion factors to convert either way.
Line up your numbers and units in your dimensional analysis to make sure you dont mix up the units.

ie:

4.92 inches  x   2.54 cm  =  12.496 cm     x  100 mm  =   1249.6 mm  = 1250 mm
1 inch                                  1 cm

note that I bolded the significant figures. Remember, conversion factors are exact; in this case, you start off with three sig figs so your final converted units should also be 3 sig figs. You should round your answer only at the end of you calculations to prevent error propagation.

Dimensional analysis is very safe way of converting as long as you keep everything straight, by the way your final answer should be 1250 mm or 1.25 x 103 mm.

Jeff
Thanks for the correction, I mistyped the final answer. it should be 1250 mm or 1.25 x103mm as you said
1 inch = 25.4 millimeter
4.92 inches = 25.4 * 4.92 millimeter = 124.968 millimeter
Thus 4.92 in = 124.968 mm
Metric to English

Metric                                English
Centimeters (cm) x .39 =  inches

Meters (m) x 3.3 =            feet

Meters (m) x 1.1 =           yards

Kilometers (km) x .6 =     miles

Sq. centimeters (cm2) x .2 = square inches

Square meters (m2) x 10.8 = square feet

Square meters (m2) x 1.2 = square yards

Hectares (ha) x 2.5 =       acres

Cubic meters (m3) x 35.3 = cubic feet

Liters (l) x 1.1 =             quarts (lq)

Cubic meters (m3) x 284.2 = gallons

Grams (g) x .04 =           ounces (avdp)

Kilograms (kg) x 2.2 =   pounds (avdp)

Kilowatts (kW) x 1.3 =  horsepower

5.00 m x ______in    the equivalent for m to inches is 0.0254 m = 1.in
m

5.00 m x  1in/ 0.0254 m  =197. inches

this is equivalent to 2.54 cm = 1 in
or 1 m = 39.37 in
remember if you keep significant digits the same as the measured number.
The number you start with units will match the denominator units; and the equivalent units in the numerator or on top.
1 L = 1.057 qt= 1000 cubic cm
The easiest conversion to remember in this case is 2.54 cm = 1 in
When converting units make sure that the units cancel
4.92in x (2.54cm/1in) x (10mm/1cm) = 124.968mm
inches cancel and cm cancel

Hi Angela;
This is the easiest technique I know of...
1 inch = 2.54 centimeters or 25.4 mm
So...
25.4 mm/1 inch = ? mm/4.92 inches
Multiply both sides by 4.92 inches...
(4.92 inches) (25.4 mm/1 inch)=(4.92 inches)(? mm/4.92 inches)
Cancel out words...
(4.92 inches) (25.4 mm/1 inch)=(4.92 inches)(? mm/4.92 inches)
Proceed to cancel out words...
(4.92) (25.4 mm/1)=(4.92 inches)(? mm/4.92 inches)
Cancel out numbers...
(4.92) (25.4 mm/1)=(4.92)(? mm/4.92)
(4.92)(25.4 mm)=? mm
=124.968 mm