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Things You Should Know
- For imperial units, use the longest marks to measure inches. Use the next longest lines for ½ inches, the third longest for ¼ inches, and so on.
- For metric units, measure centimeters with the longest markings. Use each of the smaller marks to find the length in millimeters.
- Stretch your measuring tape across the object. Find the nearest full measurement and add the length from the smaller markings.
Steps
Method 1
Method 1 of 3:
Inches and Feet (Imperial)
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Find the longest, numbered lines to measure full inches. Pull out your measuring tape, and look for the long, thin lines with large numbers next to them. The length from one of the lines to the next one of the same size is always 1 inch.[1]
- Since 12 inches is the same as 1 foot, the number on the tape may be a different color or be labeled with an “F” to mark the length. After each foot marking, the numbers next to each inch mark will either repeat from 1 – 11 again or keep counting to 13, 14, 15, and so on. Each tape measure varies so be sure to check yours.
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Use the second longest marks to measure ½-inch increments. Find the ½-inch mark centered between the long lines marking out full inches. The line might be labeled “½” directly above it, but you can easily tell it’s the ½-inch mark if the only lines that are taller are the inch marks.[2]
- Unless it’s the first ½-inch mark on your tape measure, always add the full inch that came right before it to the measurement. For example, the half-inch mark between the 3- and 4-inch lines represents 3 ½ inches even if it isn’t labeled.
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Recognize the third longest line as ¼-inch increments. Find the ¼-inch marks centered between the ½-inch and full inch lines. These markings are shorter (and sometimes skinnier) than ½-inch lines so you can easily reference the measurement at a glance.[3]
- Each inch is split into 4 ¼-inch increments. The 2/4-inch mark is the same as the ½-inch line.
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Check the fourth longest lines to find ⅛-inch increments. Look for the shorter ⅛-inch markings centered between each of the ¼-inch lines. Each inch contains 8 of the ⅛-inch increments, but the lines are usually not labeled with numbers. [4]
- The ¼-inch, ½-inch, and ¾-inch marks can alternatively be read as 2/8-inch, 4/8-inch, and 6/8-inch.
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Measure sixteenths of an inch with the smallest, densely-packed lines. If there are lines that are even shorter than the ⅛-inch markings, then each of them represents 1/16-inch. Find the 1/16-in marks perfectly centered between the ⅛-inch lines.[5]
- Some precise measuring tapes may have marks representing 1/32-inch or even 1/64-inch. When in doubt, count the total number of lines between the inch markings to know how far it’s subdivided. For example, if there are 16 total marks, then the smallest mark is 1/16-inch.
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Reference double arrows and diamonds for stud and truss spacing. Extend your tape measure and check every 16 inches for a set of 2 arrows. Since this is the standard distance between wall studs, you can easily extend the full tape and mark their locations. If you see a black diamond every 19.2 inches, you can easily reference them for standard locations to install roof trusses.[6]
- If you’re not measuring for wall studs or roofing, don’t worry about any of these markings since you won’t need to use them.
Method 2
Method 2 of 3:
Centimeters and Meters (Metric)
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Find centimeters using the longest numbered markings. Look for the most prominent markings with large numbers next to them. The color of the number may be a different color every 10 centimeters so you can easily reference the length you’re measuring.[7]
- Every 100 centimeters, the number may be a different color or be labeled with an “M” to mark out 1 meter in length. After each meter, the centimeter markings may start over again at 1 or continue counting to 101, 102, and so on. This varies from measuring tape to measuring tape.
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Use the second longest lines to measure half-centimeter increments. Many metric measuring tapes have slightly shorter marks that are evenly spaced between each centimeter line. These marks are usually not labeled with a number.[8]
- The metric system is in base ten, which makes it much easier to work with decimals compared to fractions in imperial measurements. For example, write out 0.5 centimeters instead of ½ centimeters.
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Measure millimeters with the smallest, densely-packed markings. Each millimeter represents 1/10 of a centimeter, or 0.1 centimeters. Each centimeter contains 10 millimeters.[9]
- Metric tape measures rarely have units smaller than millimeters because it’s difficult to measure them precisely.
Method 3
Method 3 of 3:
Taking Measurements
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Place the tape’s hook at the end of the object you’re measuring. Hook the metal piece at the end of the measuring tape onto the edge of the object so it doesn’t slip. If you’re measuring the inside distance, such as the distance across a door frame or from one wall to another, push the metal hook flat against the surface instead.[10]
- The hook may also be known as the “tang.”
- Does the metal hook feel loose? It’s supposed to! When you latch it onto an object, the hook pulls out so its width isn’t included in your measurement. When you push it up against the object on an inside measurement, the hook pushes flush against the tape so its width doesn’t affect your measurement.
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Stretch the tape across your object. With the hook and 0 mark in place at one end of the object, pull the tape measure back to let more tape out. Use one hand to hold the end of the tape in place as you stretch it to the full length.[11]
- Try to keep the tape as straight as you can since letting it sag can skew your measurement.
- If the end of your tape measure has a hole, hook it onto a screw or nail to keep the end from moving.
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Read the nearest mark to find the measurement. Look where the end of the object you’re measuring lines up with a marking on the tape. Find the last full inch or centimeter mark on the tape. Then, count the marks between the full unit on the tape and the end of the object to find the full measurement.[12]
- Example: If you are measuring across the front of a dresser and the edge lines up right after the 24-inch marking, this means that your dresser is between 24 and 25 inches wide. If you count three ⅛-inch marks past 24 inches, then your dresser is 24 ⅜ inches wide.
- Example: If you’re measuring a piece of wood. The edge of the wood extends past 17 centimeters but not past 18 centimeters. If you count 7 millimeter marks past the centimeter line, then the piece of wood is 18.7 centimeters long.
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Use the lock switch to keep the tape at the same length. If you need to compare or transfer your measurement, slide the lock switch forward to keep the tape from retracting. When you don’t need the measurement anymore, then pull the lock switch back to feed the tape back into the case. The lock feature is helpful for:[13]
- Quickly seeing which of two objects is bigger
- Seeing whether something will fit through a certain space
- Keeping the tape available for multiple quick measurements
- Keeping a certain distance “handy” to avoid having to re-measure
Video
Tips
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If you want to take body measurements for clothing, use a flexible measuring tape instead. Wrap the tape around the body part you’re measuring, and pinch the tape where it overlaps to find your measurement.[14]
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Check to see if the size of the case is listed somewhere on your tape measure. That way, you can easily add the size to the tape’s length if you’re measuring a tight space where you can’t fully extend the tape.[15]
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Warnings
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Avoid letting the tape snap back quickly into the case since it could hurt you. Slowly feed the tape back into the case instead.Thanks
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