Randy L. Woods pleaded guilty to conspiring to manufacture methamphetamine, in violation of 21 U.S.C. § 846. Overruling his drug-quantity objection, the district court 1 sentenced Woods to 92 months imprisonment and 4 years supervised release. Woods renews his drug-quantity argument on appeal.

We conclude that the district court did not clearly err in determining Woods’s drug quantity. See United States v. Milton, 153 F.3d 891, 898 (8th Cir. 1998) (standard of review), cert, denied, 525 U.S. 1165, 119 S.Ct. 1082, 143 L.Ed.2d 83 (1999). The court properly relied on expert evidence, see United States v. Hunt, 171 F.3d 1192, 1196 (8th Cir. 1999), and properly estimated the capacity of Woods’s laboratory based on an amount of precursor chemicals, see United States v. Anderson, 236 F.3d 427, 429 n. 5 (8th Cir. 2001) (per curiam). The court was entitled to believe the defense expert’s testimony that Woods’s laboratory could have theoretically produced the drug quantity urged by the government, while disbelieving the expert’s testimony about the unlikelihood that a clandestine methamphetamine laboratory would have been able to do so. See United States v. Moore, 212 F.3d 441, 446 (8th Cir. 2000).

We decline to consider Woods’s argument that the purity of a small quantity of methamphetamine seized from the laboratory should be used to estimate the laboratory’s capacity because he presents it for file first time on appeal. See Tarsney v. O’Keefe, 225 F.3d 929, 939 (8th Cir. 2000), cert, denied, — U.S.-, 121 S.Ct. 1364, 149 L.Ed.2d 292 (2001). Accordingly, we affirm the judgment of the district court.