Practical measurement guide
Measurement Guides
Read practical measurement guides for rulers, tape measures, rounding, screen size, and metric-imperial notation.
Measurement guides explain how to read, convert, and round practical length and size measurements.
in
Decimals and fractions work, for example 1.5, 1/2, or 1 1/2.
cm
Try a value
Fractions
12 in = 30.48 cm
12 in × 2.54 = 30.48 cm
Decimal inches12 in
Feet + inches0 ft 12 in
Nearest 1/16 inch12"
Measurement guide hub
These guides explain practical measurement tasks that support the converter ecosystem, such as reading rulers, understanding fractions, and comparing metric and imperial notation.
Use tools before rounding
Calculate with exact conversion factors first. Round only when the task allows it, such as a rough fit check or a readable chart.
Related measurement tools
Frequently asked questions
What topics belong in measurement guides?
Rulers, tape measures, rounding, screen measurement, and metric-imperial notation belong here.
Are guides separate from calculators?
Guides explain the method and link to the relevant calculators.