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Pinwheel Block Calculator
Work out the cut size and fabric needed for pinwheel quilt blocks.
🧵 Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Free Quilting Tool
Compare Your Options And Get Clear Answers
Work out the cut size and fabric needed for pinwheel quilt blocks.
Pinwheel Block Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Cut slightly larger and trim the half square triangles for crisp points.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Pinwheel Quick Guide
Typical values for reference.
| Block | HST | Cut Square | Note |
|---|---|---|---|
| 6 in | 3 in | 3.875 | Small |
| 8 in | 4 in | 4.875 | Medium |
| 12 in | 6 in | 6.875 | Standard |
| 16 in | 8 in | 8.875 | Large |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Pinwheel Block Calculator FAQ
Answers to common questions about this calculator.
Finished half square triangle size plus 7/8 inch.
Four.
Trimming gives better accuracy.
Yes.