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ACCURACY OF MEASUREMENT

We took 100 consecutive measurements and got these results:

On iPhone 6 Plus:

∙ Mean squared error - 0.49%
∙ Maximum inaccuracy - 1.2%
∙ Number of measurements where inaccuracy was within 1% - 93

On iPhone 4:

∙ Mean squared error - 1.02%
∙ Maximum inaccuracy - 3.0%
∙ Number of measurements where inaccuracy was within 1% - 65, within 2% - 96

The accuracy of measurements depends on the device, however the error rarely exceeds 3%. You can always increase accuracy by making a series of measurements. If you make a series of measurements, the degree of error is usually 1% or less.

The app cannot replace a ruler completely as a ruler has a fixed degree of inaccuracy (half of the smallest increment) but it is useful for getting an approximate measurement without a ruler as, remember, your device is always with you.

In some cases, when you know that the distance is some kind of standard size, you can say with a degree of certainty that you will get an accurate result. For example, if you measure a piece of furniture, which is nearly always a length in multiples of 6″, and you get 2′ 11 1/2″ then more than likely the real result is 3′. Or if you are using the metric system, if you get 61 cm then more than likely the real result is 60 cm.

Angles can be measure with the app to an accuracy of one degree so the app can easily take the place of a protractor or a goniometer (angle measurer). 

This video is to show the accuracy of the app when measuring distances.

Remember a single measurement is not very accurate but you can vastly improve the accuracy with a series of measurements.

 

Inches

 

 

 

A - number of measurement

B - measurement value

C - measurement error (inches)

D - measurement error (percent)

E - average

F - average error (inches)

G - average error (percent)

A B C D E F G
1 11 1516 116 0,5% 11 1516 116 0,5%
2 1 38 38 3,1% 1 18 18 1%
3 11 1316 316 1,6% 1 116 116 0,5%
4 1 18 18 1% 1 116 116 0,5%
5 1 18 18 1% 1 116 116 0,5%
6 11 78 18 1% 1 116 116 0,5%
7 11 1116 516 2,6% 1 0 0%
8 11 34 14 2,1% 11 1516 116 0,5%
9 1 18 18 1% 1 0 0%
10 11 38 58 5,2% 11 1516 116 0,5%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 Centimeters

 

 

 

A - number of measurement

B - measurement value

C - measurement error (centimeters)

D - measurement error (percent)

E - average

F - average error (centimeters)

G - average error (percent)

 

A B C D E F G
1 30,0 cm 0,0 cm 0% 30,0 cm 0,0 cm 0%
2 29,1 cm 0,9 cm 3% 29,6 cm 0,4 cm 1,3%
3 30,1 cm 0,1 cm 0,3% 29,7 cm 0,3 cm 1%
4 29,4 cm 0,6 cm 2% 29,7 cm 0,3 cm 1%
5 30,9 cm 0,9 cm 3% 29,9 cm 0,1 cm 0,3%
6 29,5 cm 0,5 cm 1,7% 29,8 cm 0,2 cm 0,7%
7 30,1 cm 0,1 cm 0,3% 29,9 cm 0,1 cm 0,3%
8 30,1 cm 0,1 cm 0,3% 29,9 cm 0,1 cm 0,3%
9 31,0 cm 1,0 cm 3,3% 30,0 cm 0,0 cm 0,0%
10 30,0 cm 0,0 cm 0% 30,0 cm 0,0 cm 0,0%