Assess a chemical process against all twelve Principles of Green Chemistry using an anchored rubric. Score each principle 0–5 and watch the radar chart and overall score update live. All data stays in your browser — nothing is sent to any server.
The DodecaGreen Score is a holistic, rubric-based assessment of how well a chemical process adheres to the 12 Principles of Green Chemistry (Anastas & Warner, 1998). Unlike single metrics such as atom economy or E-factor, it provides a 360° view across all principles simultaneously.
| Symbol | Term |
|---|---|
| $P_i$ | Score for Principle $i$ (0 = very poor / no data, 5 = excellent); maximum 5 per principle |
| 60 | Maximum possible total (12 principles × 5) |
| DodecaGreen Score | Rating | Typical interpretation |
|---|---|---|
| ≥ 75% | Excellent | Process exemplifies green chemistry across most principles |
| 50–74% | Good | Strong in several areas; targeted improvements possible |
| 35–49% | Moderate | Notable gaps; multiple principles need attention |
| < 35% | Needs improvement | Fundamental redesign recommended across several principles |
| Metric | What it measures | Stage |
|---|---|---|
| DodecaGreen Score | Holistic rubric assessment across all 12 Principles | Any |
| Atom Economy (AE) | Fraction of reactant mass in desired product (theoretical) | Design |
| E-factor | Total waste per unit of product (includes solvents) | Experimental |
| PMI | Total input mass per unit product | Experimental |
| RME | Combined practical efficiency (AE × yield × stoichiometry) | Experimental |
Each level is anchored to measurable criteria to improve inter-rater reliability. Use this table alongside the individual principle guides (click any principle name in the Score section below).
| Principle | 0 — Very Poor or Missing Data | 1 — Poor | 2 — Needs improvement | 3 — Satisfactory | 4 — Good | 5 — Excellent |
|---|---|---|---|---|---|---|
| 1. Prevention | Ef ≥ 4.00 | 2.00 ≤ Ef < 4.00 | 1.00 ≤ Ef < 2.00 | 0.50 ≤ Ef < 1.00 | 0.25 ≤ Ef < 0.50 | Ef < 0.25 |
| 2. Atom Economy | AE < 30% | 30 ≤ AE < 45% | 45 ≤ AE < 60% | 60 ≤ AE < 75% | 75 ≤ AE < 90% | AE ≥ 90% |
| 3. Less Hazardous Synthesis | >1 GHS Cat. 1–2 | Only 1 GHS Cat. 1–2 | ≥1 GHS Cat. 3 | ≥1 GHS Cat. 4 | Only GHS Cat. 5 | No GHS hazard codes |
| 4. Designing Safer Chemicals | No LD50/LC50 data | LD50 < 5 mg/kg or LC50 < 0.5 mg/L | 5 ≤ LD50 < 50 | 50 ≤ LD50 < 300 | 300 ≤ LD50 < 2000 | LD50 ≥ 2000 mg/kg |
| 5. Safer Solvents | Multiple GSK "red" solvents | Single GSK "red" solvent | Multiple GSK "yellow" | Only one GSK "yellow" | Only GSK "green" solvents | No solvents used |
| 6. Energy Efficiency | kWh ≥ 20 | 5 ≤ kWh < 20 | 2 ≤ kWh < 5 | 0.5 ≤ kWh < 2 | 0.05 ≤ kWh < 0.5 | kWh < 0.05 |
| 7. Renewable Feedstocks | 0% renewable | 0–20% renewable | 20–40% renewable | 40–60% renewable | 60–80% renewable | 80–100% renewable |
| 8. Reduce Derivatives | ≥5 deriv. steps | 4 steps | 3 steps | 2 steps | 1 step | 0 steps |
| 9. Catalysis | No catalyst | TON = 1 (stoichiometric) | 1 < TON ≤ 50 | 50 < TON ≤ 1000 | 1000 < TON ≤ 100 000 | TON > 100 000 |
| 10. Design for Degradation | t½ ≥ 365 d or no data | 180 ≤ t½ < 365 d | 60 ≤ t½ < 180 d | 10 ≤ t½ < 60 d | 1 ≤ t½ < 10 d | t½ < 1 d |
| 11. Real-time Analysis | No analysis | Post-reaction only | Occasional in-process | Frequent in-process | Continuous in-process | Automated monitoring & feedback |
| 12. Inherently Safer Chemistry | ΔT > 200 K or ΔP > 50 bar or explosive | 100 < ΔT ≤ 200 K or 10 < ΔP ≤ 50 bar | 50 < ΔT ≤ 100 K or 1 < ΔP ≤ 10 bar | 0 < ΔT ≤ 50 K and 1 < ΔP ≤ 10 bar, Cat. 4–5 | ΔT ≤ 50 K and ΔP = 0, Cat. 4–5 | ΔT = 0, ΔP = 0, no GHS codes |
AE = atom economy · Ef = E-factor · GHS = Globally Harmonized System · TON = turnover number · t½ = environmental half-life
Use the rubric above to assign each principle a score of 0–5. Click a principle name to open its full guide page.
| Principle | Score | Level | Comment |
|---|
Adjust the sliders above to see the interpretation.
Export the current assessment as a PDF report, CSV data file, or SVG radar chart.
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Roles follow the CRediT taxonomy (Contributor Roles Taxonomy), adapted for educational software. Hover a contributor's name for a summary, or a column header for the definition of that role.
| Contributor |
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© 2024– DodecaGreen Project. All rights reserved. · Last updated: 03/06/2026
This portal was built with the assistance of a large language model (Claude, Anthropic), which was used to generate and refine code, articulate and structure contributed ideas within the defined page format, and support iterative design decisions. All scientific content, conceptual frameworks, pedagogical choices, and final outputs were directed, reviewed, and verified by the contributors listed above.
If you use this tool in teaching or published work, please cite the DodecaGreen portal as the source.