Frequently Asked Questions

Find answers to the most frequently asked questions below. Can't find an answer to your question? Please contact us directly at


No, TAPPI does not currently accept custom orders or develop custom charts.
No, TAPPI does not calibrate pre-purchased charts. Calibrated Sized Estimation Charts can be purchased directly from TAPPI.
All 23 dots on each Calibrated Size Estimation Chart have been individually measured and documented within stated tolerances so you do not have to do the calibration or measurement validation.
The lines/rectangles are for visual reference only and their measurements are not included on the chart template. Some chart users utilize the lines for visual inspection.