Assess any chemical process against all twelve principles.
Interactive rubrics, standalone calculators, and a single holistic score — for students, educators and bench chemists. Free and browser-local.
The twelve principles of green chemistry.
Each principle has its own guide page — what it means, why it matters, how it is scored, and worked examples.
Standalone calculators for specific metrics.
Each tool computes one green-chemistry metric with live charts and PDF/CSV export. Use them alongside the DodecaGreen Score, or on their own.
Atom Economy
Theoretical fraction of reactant mass that ends up in the desired product.
Open tool →E-factor
Total mass of waste per unit mass of product, including solvents and workup.
Open tool →Process Mass Intensity
Total input mass per unit of product — a single-number view of material use.
Open tool →Reaction Mass Efficiency
Combined practical efficiency: atom economy × yield × stoichiometry.
Open tool →Chemical Yield
Fraction of the theoretical product actually isolated — identifies losses from incomplete reaction or purification.
Open tool →Solvent Intensity
Mass of solvent used per unit of product — the dominant E-factor contribution.
Open tool →Space-Time Yield
Productivity per unit reactor volume per unit time — for scale-up planning.
Open tool →Energy Efficiency
Specific Energy Consumption (SEC) — energy input per gram of product isolated.
Open tool →Global Warming Potential
CO₂-equivalent impact of the inputs and energy used in a process.
Open tool →Carbon Footprint
End-to-end CO₂-equivalent emissions across feedstocks, energy and waste.
Open tool →Zero-Waste Index
Aggregate measure of how close a process gets to closed-loop, zero-waste operation.
Open tool →Raw Material Cost
Total cost of raw materials per gram of product — identify which reagents or solvents dominate process cost.
Open tool →Turnover Number & Frequency
Turnover number (TON) and average turnover frequency (TOF) from moles of product and catalyst used.
Open tool →Selectivity
Desired-product selectivity from moles or masses of all products formed — distinguish between conversion and selectivity.
Open tool →Solvent Recycle Index
Fraction of solvents recovered and recycled in a process — reward circular solvent use and identify recovery gaps.
Open tool →Carbon Intensity
kg CO₂eq per kg of product — combining energy-source emission factors and material contributions with industry benchmarks.
Open tool →Waste Generation Rate
Mass of waste generated per unit time — quantify how quickly waste accumulates and compare batch vs continuous processes.
Open tool →Waste Recycle Rate
Percentage of generated waste that is recycled or recovered — measure process circularity and identify the streams with the greatest recovery potential.
Open tool →Catalyst Productivity
Mass of product formed per mass of catalyst used — a practical measure of catalytic efficiency across cycles.
Open tool →Catalyst Lifetime
Track per-cycle catalyst activity, deactivation rate, half-life, and cumulative turnover number over multiple runs.
Open tool →Reactant Conversion
Percentage of each reactant consumed in a reaction from initial and remaining masses — identify the limiting reagent and compare conversions.
Open tool →Material Recycle Index
Fraction of all process materials (reagents, solvents, catalysts, auxiliaries) recovered and recycled — a single measure of circular economy performance.
Open tool →Waste Treatment Efficiency
Percentage of waste effectively treated, rendered harmless, or properly disposed of — evaluate end-of-pipe performance.
Open tool →Biogenic Carbon Content
Fraction and mass of carbon from biological (renewable) sources versus fossil sources — quantify how bio-based a process feedstock is.
Open tool →Recycled Content
Fraction of recycled material in a product or blend — reward circular feedstock use and document post-consumer or post-industrial input.
Open tool →Renewable Carbon Index
Renewable carbon as a percentage of total carbon content — distinguish biogenic, captured CO₂, and recycled carbon streams from fossil.
Open tool →Renewable Feedstock %
Fraction of process inputs from renewable sources by mass or carbon content — quantify bio-based feedstock use against the full process inventory.
Open tool →Operating Cost
Total recurring operational cost — energy, labour, maintenance, materials — per reporting period and per unit of product output.
Open tool →Capital Efficiency
How effectively capital investment (CAPEX) is converted into revenue or output value — benchmark project returns against capital deployed.
Open tool →Cost Effectiveness
Total cost per unit of useful output — or benefit per unit cost — to identify where process costs are disproportionate to value delivered.
Open tool →A hub for holistic, systems-level sustainable science.
DodecaGreen is an open educational portal. Starting from the twelve principles of green chemistry, we have developed a growing suite of calculators, rubrics and resources to help researchers, students and educators maintain a critical view of their work — and push themselves to design ever more sustainable processes and systems.
The goal is not just compliance with a checklist, but a genuinely holistic way of thinking: one that holds together efficiency, safety, environmental impact and systemic trade-offs in a single view.