Calculators
Envelope Punch Board
Enter a card size → get accurate paper size & first score line (rounded to 1/8″). Includes Letter/A4 fit check.
Knitting Gauge Calculator
Your gauge vs. pattern gauge → adjusted stitch/row counts and practical suggestions (needle up/down, yarn weight).
Knitting Row Counter
Simple row counter with auto-save and screen wake lock. Track your progress with large tap-friendly buttons.
Sewing & Cricut (ideas)
Bias tape, seam allowance, vinyl cost per cut, resin mold volume … which should we ship next?
Have a calculator request?
Email hello@craftermath.com with your idea and sample measurements. We'll try to add it.
About CrafterMath
We build tiny, accurate tools for makers. Each calculator is tested against real projects and uses plain‑English results, craft‑friendly rounding, and clear printing.
- Mobile‑friendly and fast
- Works offline once loaded (add to Home Screen)
- Privacy‑friendly — no trackers by default
What's next?
- More presets for common card sizes
- Additional knitting calculator features
- Optional print‑ready PDF exports
- Your suggestions! Email us with ideas
Support & Recommended Tools
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