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+---
+id: 2026-03-29T16:01:12-04:00
+aliases: []
+title: 2026-03-29 16:01:12
+tags:
+  - destiny/permanent
+  - status/draft
+  - type/periodic/timestamped
+dg-publish: true
+date-created: 2026-03-29T16:01:12-04:00
+daily: "[[2026-03-29]]"
+weekly: "[[2026-W13]]"
+monthly: "[[2026-03]]"
+quarterly: "[[2026-Q1]]"
+yearly: "[[2026]]"
+---
+# 2026-03-29 16:01:12
+
+## AACE Estimate Classification
+
+[Association for the Advancement of Cost Engineering (AACE)](https://web.aacei.org/)
+
+AACE International Recommended Practice No. 18R-97
+
+| Estimate Class                                | Expected Accuracy (Low) | Expected Accuracy (High) |
+| --------------------------------------------- | -----------------------:| ------------------------:|
+| Class 5 --- Concept Screening                 |            -20% to -50% |            +30% to +100% |
+| Class 4 --- Study or Feasibility              |            -15% to -30% |             +20% to +50% |
+| Class 3 --- Budget, Authorization, or Control |            -10% to -20% |             +10% to +30% |
+| Class 2 --- Control or Bid/Tender             |             -5% to -15% |              +5% to +20% |
+| Class 1 --- Check Estimate or Bid/Tender      |             -3% to -10% |              +3% to +15% |
+
+![](https://library.aacei.org/pgd01/PGD01_Figure1.png)