CADR Efficiency Calculator - Find Most Energy-Efficient Air Purifiers
Calculate CADR per watt efficiency to identify the most energy-efficient air purifiers. Compare models, estimate energy costs, and find units that deliver maximum clean air with minimum power consumption.
Calculator Inputs
CADR Ratings
Power Consumption
Electricity Rate
US average: $0.14/kWh
Example Models
Industry Efficiency Standards
Excellent (4.0+ CFM/W)
Top-tier efficiency found in premium models
Examples: High-end Blueair, Coway flagship models
Very Good (3.0-3.9 CFM/W)
Above-average efficiency with good performance
Examples: Quality Levoit, Winix, mid-range Honeywell
Good (2.0-2.9 CFM/W)
Acceptable efficiency for most applications
Examples: Mainstream models, budget-friendly options
Fair (1.0-1.9 CFM/W)
Below-average efficiency, consider alternatives
Examples: Older models, very basic units
Poor (<1.0 CFM/W)
Inefficient, upgrade recommended
Examples: Outdated technology, maintenance needed
Popular Model Comparison
| Model | Brand | Power | Avg CADR | Efficiency | Rating |
|---|---|---|---|---|---|
| Core 400S | Levoit | 45W | 237 | 5.3 CFM/W | Excellent |
| AP-1512HH | Coway | 77W | 240 | 3.1 CFM/W | Very Good |
| Blue Pure 211+ | Blueair | 61W | 350 | 5.7 CFM/W | Excellent |
| HPA300 | Honeywell | 170W | 307 | 1.8 CFM/W | Fair |
| MA-40 | Medify Air | 55W | 330 | 6 CFM/W | Excellent |
Recommended Efficient Air Purifiers
No products found matching your efficiency requirements.
Try adjusting your CADR or power values.
Understanding CADR Efficiency
What is CADR Efficiency?
CADR efficiency measures how much clean air (in CFM) an air purifier delivers per watt of electricity consumed. Higher efficiency means lower operating costs and better environmental impact.
- 4+ CFM/watt = Excellent efficiency
- 3-4 CFM/watt = Very good efficiency
- 2-3 CFM/watt = Acceptable efficiency
Why Efficiency Matters
For 24/7 operation, an efficient air purifier can save $50-200 annually on electricity costs compared to inefficient models, while providing the same air cleaning performance.
- Lower electricity bills
- Better long-term value
- Reduced environmental impact