Keep your arm bent. Measure around the fullest part of your forearm, between the elbow and wrist.
Note that these measurements are for your own arm. When adjusting a garment’s arm hole, the actual circumference of the wearer’s arm should be used.
Once the upper arm and forearm circumferences are measured, add 1-2 inches to each to account for arm movement and comfort. These values will be used in the next steps to adjust the arm hole measurement.
Considering Body Shape
The shape of your body can also affect the way you measure your arm hole. If you have a wider frame, you may need to allow for more room in the arm hole. Conversely, if you have a narrower frame, you may be able to get away with a smaller arm hole.
Here is a table that shows the average arm hole measurements for different body shapes:
Body Shape |
Average Arm Hole Measurement |
Hourglass |
18-20 inches |
Pear |
19-21 inches |
Apple |
20-22 inches |
Rectangle |
18-20 inches |
Inverted Triangle |
17-19 inches |
Of course, these are just averages. The best way to determine the correct arm hole measurement for you is to take your measurements and make a muslin mock-up of the garment.
Verifying Arm Hole Size
To ensure accurate measurements, follow these additional steps:
- Check the garment’s label for the recommended armhole size, if available.
- Use a flexible measuring tape and place it around the armhole opening, starting at the armpit and extending to the end of the shoulder seam.
- Measure both armholes and compare the measurements. They should be equal or within a small margin of error (e.g., 0.5 inches or less).
- If the measurements differ significantly, inspect the garment for any inconsistencies or defects.
- Consider the fabric type and its stretchiness. Stretchy fabrics may allow for some variance in measurements.
- Try on the garment and move your arms to check for comfort and ease of movement.
- If the armholes feel too tight or too loose, adjust the measurements accordingly or consult a professional seamster for alterations.
Armhole Size |
Measurement Range |
Small |
16-18 inches |
Medium |
18-20 inches |
Large |
20-22 inches |
Extra Large |
22-24 inches |
Calibrating Measurement Tools
1. Check the Zero Point: Place the tape measure on a flat surface, and ensure that the zero mark aligns precisely with the edge of the surface.
2. Calibrate with a Ruler: Use a ruler or a measuring stick to calibrate the tape measure. Measure a known distance, such as 10 or 20 cm, and compare it to the reading on the tape measure.
3. Check the Graduations: Inspect the tape measure’s graduations to ensure they are evenly spaced and accurate. If there are any irregularities or missing markings, the tape measure may need to be replaced.
4. Calibrate with a Measuring Wheel: If you have access to a measuring wheel, use it to calibrate your tape measure. Mark a specific distance on the ground and measure it both with the tape measure and the measuring wheel. Compare the readings to identify any discrepancies.
5. Use a Caliper for Curved Surfaces: When measuring curved surfaces, such as armholes, use a caliper. A caliper can accurately measure the distance between two points on a curved surface.
6. Regularly Recalibrate: Even the highest quality measurement tools can become misaligned over time. Regularly recalibrate them to ensure they are providing accurate readings.
7. Use a Magnifying Glass: For precise measurements, use a magnifying glass to enhance the visibility of the graduations on the measurement tool.
8. Specific Considerations for Armhole Measurement:
Measurement Point |
Calibration Method |
Around the Bicep |
Use a measuring tape over the bicep, ensuring it’s snug but not too tight. Calibrate by measuring a known distance on the tape, such as 10 cm. |
Across the Back |
Lay the tape measure across the shoulder blades, ensuring it’s parallel to the floor. Calibrate by measuring a known distance, such as 30 cm. |
From the Shoulder to the Sleeve Hem |
Use a tape measure from the top of the shoulder to the desired sleeve length. Calibrate by measuring a known distance, such as 20 cm. |
Measuring the Arm Hole Depth
To determine the arm hole depth, you will need to measure from the shoulder point to the underarm point. The shoulder point is the intersection of the shoulder seam and the neckline, while the underarm point is the lowest point of the armhole. Use a flexible measuring tape or a dressmaker’s tape to ensure accuracy.
Tips for Accurate Arm Hole Measurements
For accurate arm hole measurements, follow these tips:
1. Use a flexible measuring tape:
A flexible measuring tape can easily contour the body, providing a more accurate measurement.
2. Measure while standing:
To prevent the measurement from being affected by slouching, have the person stand up straight with their shoulders relaxed.
3. Use a well-fitting garment:
If possible, measure the arm hole of a well-fitting garment to ensure a similar fit for the new garment.
4. Measure the widest part of the armhole:
Locate the widest part of the armhole and measure it accordingly. This ensures ample space for movement and comfort.
5. Consider seam allowances:
When measuring the arm hole, consider the seam allowances necessary for sewing. Add the desired seam allowance to the measurement for accuracy.
6. Measure on both sides:
Take measurements for both armholes to ensure symmetry. Slight variations can be accounted for during garment construction.
7. Use a dress form or mannequin:
If available, a dress form or mannequin can provide a more precise measurement as it represents a three-dimensional shape.
8. Double-check measurements:
It’s essential to verify the measurements by retaking them to minimize errors and ensure accuracy.
9. Consider body posture and mobility:
Take into account the person’s body posture and the intended range of motion for the garment. This helps ensure the arm hole is comfortable and allows for proper movement.
Measurement |
How to Measure |
Armhole Depth |
From shoulder point to underarm point |
Armhole Circumference |
Around the widest part of the armhole |
How to Measure Arm Hole
To correctly measure the armhole, follow these steps:
1. Raise your arm to a 90-degree angle at the elbow.
2. Using a measuring tape, measure around the circumference of your armhole, starting at the shoulder and ending at the same point.
Troubleshooting Common Arm Hole Fitting Issues
1. Armhole is too tight
If the armhole is too tight, it can restrict movement and cause discomfort. To fix this, you can:
– Enlarge the armhole by cutting away excess fabric.
– Use a stretchy fabric that will accommodate your arm’s movement.
2. Armhole is too loose
If the armhole is too loose, it can cause the garment to slip or bunch up. To fix this, you can:
– Take in the armhole by sewing it closed.
– Use boning or other support to stabilize the armhole.
3. Armhole is too high
If the armhole is too high, it can expose your underarm and bra straps. To fix this, you can:
– Lower the armhole by cutting away excess fabric from the top.
– Sew the armhole closed at the top and recreate it at a lower position.
4. Armhole is too low
If the armhole is too low, it can create a bulky and unflattering appearance. To fix this, you can:
– Raise the armhole by cutting away excess fabric from the bottom.
– Sew the armhole closed at the bottom and recreate it at a higher position.
5. Armhole is too wide
If the armhole is too wide, it can cause the garment to slip off your shoulder. To fix this, you can:
– Narrow the armhole by sewing it closed from the sides.
– Add darts or gathers to the armhole to create a more fitted shape.
6. Armhole is too narrow
If the armhole is too narrow, it can restrict movement and cause discomfort. To fix this, you can:
– Widen the armhole by cutting away excess fabric from the sides.
– Use a stretchy fabric that will accommodate your arm’s movement.
7. Armhole is too deep
If the armhole is too deep, it can cause the garment to fall too low on your shoulder. To fix this, you can:
– Shorten the armhole by cutting away excess fabric from the top.
8. Armhole is too shallow
If the armhole is too shallow, it can restrict movement and cause discomfort. To fix this, you can:
– Deepen the armhole by cutting away excess fabric from the bottom.
9. Armhole is too pointed
If the armhole is too pointed, it can create an unflattering and unnatural shape. To fix this, you can:
– Round off the armhole by cutting away excess fabric from the corners.
10. Armhole is too curved
If the armhole is too curved, it can cause the garment to bunch up and create an unflattering appearance. To fix this, you can:
– Lessen the curve of the armhole by cutting away excess fabric from the top or bottom, depending on the direction of the curve.
– Use a less stretchy fabric that will hold its shape better.
How to Measure Arm Hole
Step 1: Determine the armhole depth. This is the distance from the top of your shoulder to the bottom of your armpit. To measure the armhole depth, place one end of a measuring tape at the top of your shoulder and extend it down to the bottom of your armpit. Hold the tape taut and record the measurement.
Step 2: Determine the armhole width. This is the distance across your chest at the armpit level. To measure the armhole width, place one end of a measuring tape at the center of your chest and extend it across your chest to the other armpit. Hold the tape taut and record the measurement.
Step 3: Determine the armhole circumference. This is the distance around your upper arm at the armpit level. To measure the armhole circumference, wrap a measuring tape around your upper arm at the armpit level. Hold the tape taut and record the measurement.
People Also Ask About How to Measure Arm Hole
What is the difference between armhole depth and armhole width?
Armhole depth is the distance from the top of your shoulder to the bottom of your armpit, while armhole width is the distance across your chest at the armpit level.
How do I know if the armhole is the right size?
The armhole is the right size if it is snug but not too tight. You should be able to move your arms freely without any restriction.
What happens if the armhole is too small?
If the armhole is too small, it will restrict your movement and can cause discomfort. It can also make it difficult to wear clothing that has sleeves.
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