The WACC of 3M Co (MMM) is 6.4%.
| Range | Selected | |
| Cost of equity | 6.20% - 8.00% | 7.10% |
| Tax rate | 18.90% - 19.70% | 19.30% |
| Cost of debt | 4.00% - 4.50% | 4.25% |
| WACC | 5.6% - 7.2% | 6.4% |
| Category | Low | High |
| Long-term bond rate | 3.9% | 4.4% |
| Equity market risk premium | 4.6% | 5.6% |
| Adjusted beta | 0.5 | 0.56 |
| Additional risk adjustments | 0.0% | 0.5% |
| Cost of equity | 6.20% | 8.00% |
| Tax rate | 18.90% | 19.70% |
| Debt/Equity ratio | 0.23 | 0.23 |
| Cost of debt | 4.00% | 4.50% |
| After-tax WACC | 5.6% | 7.2% |
| Selected WACC | 6.4% | |