| RTI | Return Temp Index | RTI = (Treturn − Tsupply) / (Tout − Tin) | 95% ≤ RTI ≤ 105% | 100% |
| RHI | Rack Heat Index | RHI = (Tin − Tsupply) / (Treturn − Tsupply) | 0.8 ≤ RHI | 1.0 |
| RCIHI | Rack Cooling Index High | RCIHI = [1 − Σ(Ti − Tmax) / (n · (Tmax,all − Tmax))] × 100 | 96% ≤ RCIHI ≤ 104% | 100% |
| RCILO | Rack Cooling Index Low | RCILO = [1 − Σ(Tmin − Ti) / (n · (Tmin − Tmin,all))] × 100 | 96% ≤ RCILO ≤ 104% | 100% |
| RI | Recirculation Index | RI = [1 − (T̄rack,inlet − Tsupply) / Tsupply] × 100 | ≈ 100% | 100% |
| LI | Leakage Index | LI = [1 − (T̄rack,outlet − Treturn) / T̄rack,outlet] × 100 | ≈ 100% | 100% |
| PUE | Power Usage Effectiveness | PUE = EDC / EIT | 1.0 ≤ PUE ≤ 2.0 | 1.0 |
| CoP | Coefficient of Performance | CoP = 1 / (PUE − 1) | — | ∞ |
| WUE | Water Usage Effectiveness | WUE = WIN / EIT | 0 ≤ WUE ≤ 1.8 | 0 |
| ERF | Energy Reuse Factor | ERF = EREUSE / EIT | 0.5 ≤ ERF ≤ 1.0 | 1.0 |
| REF | Renewable Energy Factor | REF = ERES-TOT / EIT | 0.6 ≤ REF ≤ 1.0 | 1.0 |
| PES | Primary Energy Savings | PES = EDC − EIT | — | 0 |
