Introduction Map Titles Compass Map Key

MAP SCALE: HOW DO I CALCULATE IT?

There are three different measuring units listed on the scale for this map.  Let’s figure all three measurements.

To figure actual inches, we must use the ratio scale.  According to the scale, 1 actual inch on the map is equal to 10,000 inches on the ground.  We would need to multiply the measured distance, which was 8 inches, by 10,000 to calculate the actual distance on the ground in inches.  The following formula calculates the distance in inches.

8 x 10,000 = 80,000 inches

To figure the distance in feet, we must use the written scale.  It is figured the same way as the ratio scale.  We would need to multiply the measured distance, which was 8 inches, by 833 to calculate the actual distance on the ground in feet.  The following formula calculates the distance in feet.

8 x 833 = 6,664 feet

Finally, to figure the distance in miles, we must use the bar measurement.  It is calculated the same way as a ratio scale and written scale.  We would need to multiply the measured distance, which was 8 inches, by 1/20 to calculate the actual distance on the ground in miles.  The following formula calculates the distance in miles.

8 x 1/20 = 8/20 miles = 2/5 mile

Since this scale measurement was expressed in a fraction form, it was reduced to express the distance in the simplest of terms.