Dart Manipulation Calculator
Calculate dart rotation and distribution for pattern adjustments including angle, width, and depth per dart.
Inputs
°
in
in
Results
Angle per Dart
15°
Width per Dart1.31 in
Total Dart Width2.61 in
Dart Depth0.04 in
Dart Leg Length5 in
Total Pickup3 in
How to Use This Calculator
- Enter the total bust dart angle from your sloper or base pattern.
- Input the number of darts you want to distribute the ease across.
- Enter the bust radius (distance from bust point to side seam).
- Review Angle per Dart and Dart Pickup per Dart for each new dart location.
- Rotate each dart to its new position using the calculated angles, keeping all darts pointing to the bust point.
How the result changes with Number of Darts
| Number of Darts | Angle per Dart |
|---|---|
| 1.5 | 20° |
| 2.75 | 10.9° |
| 4.25 | 7.1° |
| 5.5 | 5.5° |
What each input means
- Total Bust Dart Angle
- Total dart angle to distribute (typically 25-40°)
- Number of Darts
- Number of darts to split the shaping into
- Bust Radius
- Distance from bust point to dart point (dart leg length)
- Dart Pickup per Dart
- Fabric pickup width at the dart seamline
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersTotal Bust Dart Angle = 30, Number of Darts = 2, Bust Radius = 5, Dart Pickup per Dart = 1.5 = 4 input(s) provided
- Calculate Angle per DartAngle per Dart15 = 15
- Calculate Width per DartWidth per Dart1.31 = 1.31
- Calculate Total Dart WidthTotal Dart Width2.61 = 2.61
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