Embodied Carbon Calculators

Paving & Hard Surfacing
Structural & Civil
Soft Landscape Materials
Furniture, Lighting & Equipment
Carbon Reduction Strategies
A1–A3 Category Breakdown
CategoryGross CO₂e (kg)ReductionsNet CO₂e (kg)% of Total
Carbon Intensity A1–A3
kg CO₂e/
RIBA 2030 Target Compliance
ICE Database v3.0 (University of Bath / BEIS 2019): factors represent cradle-to-gate (A1–A3) embodied carbon. Recycled content reduces factor: virgin to recycled saves up to 70% for steel, 50% for aluminium. RIBA 2030 Landscape target: <300 kg CO₂e/m².
A4 — Materials Transport
A5 — Construction Site Activities
A4 & A5 Carbon Breakdown
ActivitySub-categoryGross CO₂e (kg)
A4 Materials Transport
kg CO₂e
A5 Total Construction
kg CO₂e
Waste Diversion Rate
%
B1–B4 Service, Maintenance, Repair
B6 Operational Energy
B3–B4 Replacement Items
B-Phase Breakdown
PhaseDescriptionGross CO₂e (kg/yr)Total Life CO₂e (t)
B1 Service / B2 Maintenance
kg CO₂e/yr
B6 Operational Energy
kg CO₂e/yr
B3–B4 Repair & Replacement
kg CO₂e total
C1 — Demolition
C2–C4 — Waste Transport & Processing
Should total 100%
C-Phase Breakdown
PhaseDescriptionCO₂e (kg)
C1 Demolition
kg CO₂e
C2 Transport to Waste
kg CO₂e
C3 Processing
kg CO₂e
C4 Landfill Disposal
kg CO₂e
Waste Diversion Rate
%
D — Biogenic Carbon & Sequestration Credits
Density 450 kg/m³, 50% carbon content to stored carbon
From Carbon Sequestration tool or manual estimate
Biogenic Carbon — Timber
tCO₂e stored (negative credit)
Living Biomass Carbon
tCO₂e
Sequestration Credit / yr
tCO₂e/yr
Biogenic carbon stored in harvested wood products = mass × 0.50 (carbon fraction) × 3.67 (CO₂:C ratio) × reuse credit. Living biomass per GHG accounting. Sequestration credits applied per year × design life.
Whole-Life Parameters
Values auto-populated from previous tabs. Edit directly to override.
Valuation & Benchmark
Whole-Life Phase Breakdown
PhaseDescriptionkg CO₂etCO₂e% of A–C
A1–C4 Gross Total
tCO₂e
Carbon Intensity (whole-life)
kg CO₂e/
Carbon Cost (social)
$ value
Years to Carbon Neutrality
years via sequestration
Target Compliance
RIBA 2030 Roadmap: <300 kg CO₂e/m² for landscape (whole-life A1–C). LETI 2030 Climate Emergency Design Guide: <200 kg CO₂e/m². PAS 2080:2023 requires whole-life carbon assessment for infrastructure projects.