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The accuracy of length and diameter measurements, and the effect on log value of diameter measurements made with bucker's tape, angle-gauge and calipers were evaluated in a field study of computer-aided bucking at the stump. The time cost of data entry added 33% to the total time needed to fell and buck a tree. When the potential gain in log value was considered, the additional cost represented 0.4% of old-growth value and 2.0% of second-growth value. Errors in length measurement were not significant. Angle-gauge and tape measurements varied more than caliper measurements. Errors in diameter measurement resulted in a substantial loss in potential value: 2.7% to 5.2% when a bucker's tape was used, 2.0% with the angle gauge, and 1.2% to 1.4% with calipers.