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Carbon Sequestration & Sustainability Metrics

Professional carbon, biodiversity, and sustainability tools for landscape architects. Quantify carbon sequestration, embodied carbon, urban heat island mitigation, biodiversity net gain, and site-wide sustainability performance for evidence-based, net-zero aligned landscape design.

Project Details
Tree Planting
Ground Cover & Vegetation
Rate: 0.15 kg CO₂/m²/yr
0.55 kg/m²/yr
0.40 kg/m²/yr
0.25 kg/m²/yr
0.60 kg/m²/yr
0.80 kg/m²/yr
Soil Amendments (One-off)
×3.67×0.80 perm = kg CO₂e
500 kg/m³ × 0.50 × 0.50 humif.
Annual Carbon Breakdown
Total Annual Sequestration
–
kg CO₂/yr
Tree Sequestration
–
kg CO₂/yr
Ground Cover
–
kg CO₂/yr
Soil Carbon (one-off)
–
kg CO₂e
Total over Design Life
–
tCO₂e
Rate per Area
–
kg CO₂/m²/yr
Equivalent Car-km Offset
–
km/yr
Equivalent Households
–
homes/yr
Carbon Market Value
Annual Offset Value
–
$/yr
Lifetime Offset Value
–
$
Rates: i-Tree Eco, FC Bulletin 48, USDA FS. Apply maturity (0.25–1.0×) and growth rate (0.8–1.2×) multipliers. Biochar permanence 0.80. Compost: 500 kg/m³ dry × 50% C × 50% humification × 3.67 CO₂:C.
CO₂
Embodied Carbon Calculator
Full lifecycle embodied carbon analysis (A1–A5, B1–B6, C1–C4, D) for landscape materials, transport, construction, maintenance and end-of-life is available in the dedicated Embodied Carbon Calculator tool.
Open Embodied Carbon Calculator
Net Carbon Balance — Manual Entry
Paste totals from the Embodied Carbon tool to calculate net project carbon balance.
Whole-Life Carbon Balance
A1–A5 Materials & Construction
B1–B6 Maintenance & Operation
C1–C4 End of Life
D Biogenic Credits
Net Whole-Life Carbon
Years to Carbon Neutrality
–
years via sequestration
Net Carbon Status
The dedicated Embodied Carbon Calculator provides full RIBA 2030 / LETI benchmarking, phase-by-phase analysis, ICE Database v3.0 carbon factors and PDF/CSV export.
Site Land Cover Composition
Total area elements. Total should not exceed site area.
Albedo 0.15
Albedo 0.25
Albedo 0.20
Albedo 0.06
Albedo 0.50
Albedo 0.05
Albedo 0.15
Context & Climate
Air Temp Reduction vs Baseline
–
°C cooler locally
Site Greenspace Ratio (SGR)
–
%
Tree Canopy Cover
–
% of site
Baseline Albedo
–
index
Design Albedo
–
index
ET Cooling Flux
–
MJ/m²/day
Cooling Energy Offset
–
kWh/yr est.
LEED v4.1 SSc5 — ≥ 20% canopy cover
BREEAM LE05 — Site Greenspace Ratio ≥ 40%
WHO Urban Green Space — ≥ 9 m²/resident
UHI Mitigation Rating
Each 10% increase in urban tree cover reduces peak temperature ~0.6–1.2°C (Bowler et al. 2010). Albedo gain of 0.1 to ~0.3°C surface cooling. Model is simplified for design-stage estimation.
Baseline Habitats — Pre-Development
Proposed Habitats — Post-Development
Biodiversity Enhancement Features
+0.002 BU each
+0.003 BU each
+0.001 BU each
D=6×area/10000
D=5×0.7×length/1000
+0.001 BU each
Biodiversity Net Gain / Loss
–
%
Baseline Biodiversity Units
–
BU
Proposed Units
–
BU
Feature Bonus
–
BU
Total Post-Dev Units
–
BU
UK Mandatory BNG — ≥ 10% (Metric 4.0)
BREEAM LE 02 — Ecological Enhancement
Biodiversity Deficit / Off-site Credits
DEFRA Biodiversity Metric 4.0: BU = Area(ha) × Distinctiveness × Condition × Strategic Significance. Mandatory 10% BNG in England (Environment Act 2021). Off-site statutory credits required if on-site target cannot be achieved.
Site Hydrology
15% interception
40% retention
Irrigation & Demand
Recycled Water Sources
80% retention
Mains Water Saved
–
m³/yr
Total Annual Rainfall
–
m³/yr
Canopy Interception
–
m³/yr
Rainwater Harvest Yield
–
m³/yr
Net Irrigation Demand
–
m³/yr
Runoff Reduction
–
%
Irrigation Self-Sufficiency
–
%
Annual Cost Saving
–
$/yr
LEED WE — ≥ 50% irrigation self-sufficiency
BREEAM Wat 01 — water reduction ≥ 30%
Rainwater yield = min(imperm×0.85×rain/1000, tank×10/1000). Irrigation demand adjusted for drought-tolerant planting (up to 50% reduction) and system efficiency. Runoff reduction from interception, green roofs, SuDS and permeable paving.
Project Context
Carbon & Climate
Link from Tab 1
Ecology & Biodiversity
Water & Materials
Score Ring + Breakdown
100 /100
Carbon & Climate–
Ecology & BNG–
Water–
Materials–
Certification Alignment
LEED Points (indicative)
–
pts
BREEAM Credits (indicative)
–
credits
Carbon Payback
–
years
Top 3 Improvement Opportunities
Certification thresholds: ≥80 = LEED Platinum/BREEAM Outstanding | 65–79 = Gold/Excellent | 50–64 = Silver/Very Good | 35–49 = Certified/Good. Scores are indicative; formal certification requires full audit.
Site Areas
Ecosystem Service Unit Values — TEEB/CICES
Based on TEEB/CICES/i-Tree UK unit values. Adjust to local context.
Service Value Breakdown
Total Annual Ecosystem Value
–
$/yr
Air Purification
–
Carbon Value
–
Stormwater
–
Cooling / Energy
–
Wellbeing / Amenity
–
Property Uplift (Cap)
–
Value per Area of Green Space
–
$/m²/yr
Property Value Uplift
–
$ capital
20-Year Cumulative Value
–
$
TEEB/CICES framework. Values are indicative for design iteration. Wellbeing and amenity values from landscape economics literature. Property uplift 3–15% for quality public realm. Adjust unit values to local market conditions.

CalcType: Professional Carbon & Sustainability Metrics for Landscape Architecture — This comprehensive sustainability calculator suite is engineered to support evidence-based carbon accounting, embodied carbon assessment, biodiversity impact evaluation, and climate resilience planning for landscape architects, environmental consultants, and urban designers. The Carbon Sequestration module applies species-specific sequestration rates derived from the USDA Forest Service i-Tree Eco model, the UK Forestry Commission Carbon Lookup Tables (FC Bulletin 48), and IPCC Tier 1 land-use change factors to quantify annual and lifecycle carbon uptake across trees, ground cover, and soil amendments including biochar and compost. The Embodied Carbon module covers lifecycle stages A1–A5 using carbon factors from the Inventory of Carbon and Energy (ICE) Database v3.0 (University of Bath) and published Environmental Product Declarations (EPDs), supporting compliance with RIBA 2030 Climate Challenge, LEED v4.1 Materials & Resources, and BREEAM Mat-01 credits. The Urban Heat Island module quantifies land surface albedo, evapotranspiration cooling, and estimated air temperature reduction in accordance with LEED v4.1 SSc5 methodology and peer-reviewed urban climatology research. The Biodiversity Net Gain module applies a simplified version of the DEFRA Statutory Biodiversity Metric 4.0 (2023), mandatory for major developments in England. The Water Sustainability module evaluates rainwater harvesting, stormwater attenuation, and irrigation efficiency in alignment with LEED WE and BREEAM Wat-01 credits. The composite Sustainability Score provides a project-level performance index across carbon, ecology, water, and materials pillars to guide design iteration and benchmarking. Technical Disclaimer: All carbon sequestration estimates, embodied carbon figures, biodiversity unit calculations, and sustainability scores provided by this calculator are intended for preliminary design assessment and comparative benchmarking purposes only; they do not constitute formal carbon reporting under ISO 14064, GHG Protocol, or PAS 2080, nor do they constitute statutory biodiversity net gain assessments under the UK Environment Act 2021. All outputs must be verified by a qualified carbon assessor, ecologist, or sustainability consultant prior to use in planning submissions, investor reporting, or certification applications. CalcType assumes no liability for decisions made on the basis of these estimates.