RollRule - Black
A digital rolling ruler that measures straight lines, curves, and circles in one pass and shows the exact length on an LCD — no more coaxing a stiff tape around corners or losing your place on a long run.
Why RollRule
Rigid rulers and tapes can't follow curves, and long measurements are easy to lose track of
RollRule Advantage
Rolls along straight lines, curves, and circles a tape can't follow.
RollRule Advantage
Digital LCD shows the exact distance and holds your last reading.
RollRule Advantage
One-button switch between metric and imperial units.
How It Works
- 1
Power on and choose metric or imperial with the unit button.
- 2
Zero the display, then place the wheel at your start point.
- 3
Roll steadily along the line, curve, or circle you're measuring.
- 4
Read the exact distance on the LCD — it holds until you reset.
The RollRule Difference
How RollRule compares to the usual alternatives.
| Feature | RollRule | Standard Alternatives |
|---|---|---|
| Curved lines | Rolls around any curve | Rigid, straight-only |
| Readout | Digital LCD, holds value | Squint at tick marks |
| Units | Metric/imperial toggle | One fixed scale |
Made for Everyday Use
Rigid rulers and tapes can't follow curves, and long measurements are easy to lose track of. RollRule rolls along any path and shows the exact distance digitally, so curved and lengthy measurements are quick and accurate.
User Reviews
Sewing game changer
Measuring curved hems used to be a nightmare. I roll this along the edge and get an exact number. Wish I'd bought it years ago.
Curves are exactly what it's for — happy sewing!
Perfect for trim work
Following molding around a room and getting real numbers instead of guessing has saved me so much material. Tiny and lives in my toolbox.
Less waste, cleaner cuts — thanks Grant!
Handy little tool
Accurate enough for my craft projects and the unit switch is convenient. Roll steadily for the best reading.
Great for model building
Scaling curved parts is finally easy. The display holding the last value is more useful than it sounds.
Got Questions?
Everything you need to know about using and caring for your RollRule.
Q.How accurate is it?
For everyday sewing, DIY, and craft work it's accurate to within a small fraction on typical runs when rolled steadily on a clean surface. It's a practical tool, not a certified metrology instrument.
Q.Can it really measure circles?
Yes. Roll it around the inside or outside of a curve or full circle and it totals the distance — something a straight tape simply can't do.
Q.Metric and imperial?
Both. A single button toggles between centimeters/meters and inches/feet at any time.
Q.Does it need charging?
No — it runs on a replaceable button-cell battery, so there's nothing to recharge. Just swap the cell when the display dims.