Sustainability

Buildings and Habitats Object Model - A collaborative open-source framework providing a vendor-agnostic common data dictionary and 30+ software adapters (Revit, Dynamo, Grasshopper, ETABS, TAS, GSA, Strand7, and more) to enable seamless data exchange across AEC tools without manual model recreation.

Free calculator that helps building teams estimate BREEAM certification levels (Pass, Good, Very Good, Excellent, Outstanding) based on planned green building strategies. Covers all 9 BREEAM assessment categories with category-weighted scoring: Management, Health & Wellbeing, Energy, Materials, Land Use & Ecology, Pollution, Water, Transport, and Hazards. Supports BREEAM New Construction v6, In-Use, and regional variants.

Web-based collaborative platform for building energy modeling that combines EnergyPlus simulation engine with Git-based version control, 3D visualization, and team collaboration. Reduces energy modeling time by up to 70% through cloud-based automation and model management.

SaaS platform enabling architecture and construction teams to measure, analyze, and reduce embodied, operational, and landscape carbon emissions from early design through construction delivery.

Free web-based calculator for architects, MEP engineers, and building science professionals. Analyzes dew point, surface temperature, and condensation risk in walls, roofs, and HVAC systems. Provides ASHRAE 62.1 and IBC Chapter 12 compliance assessment for interior humidity control and building envelope thermal design.

Free web-based calculator for estimating average daylight factor in interior spaces using the British Research Establishment (BRE) simplified methodology. Inputs room geometry, window area, and glazing transmittance; outputs DF percentage with interpretation against CIBSE Lighting Guide 10 standards (2%, 5% thresholds). Includes U-value selector for common glazing types and graphical visualization of daylight distribution zones.

Free web-based calculator for assessing embodied carbon impact of building materials. Input material type, quantity, and sourcing region to calculate total CO2 equivalent emissions. Uses Environmental Product Declaration (EPD) data and ISO 14040/44 LCA standards. Supports concrete, steel, wood, aluminum, insulation, masonry, and 20+ material categories. Includes regional adjustment factors for energy mix and transportation.

Free web-based calculator that sizes residential and commercial greywater systems for irrigation and toilet flushing. Calculates daily greywater generation, determines storage tank capacity, filter surface area, and treatment requirements. Uses IPC 2012/2021 standards and includes LEED/WELL compliance checking, cost estimating, and payback analysis.

Web-based calculator for landscape architects and irrigation professionals to determine water application rates (in/hr or mm/hr), design irrigation system flow capacity (GPM), and verify sprinkler head coverage based on spacing and flow rates. Converts between multiple flow and area units and provides rapid system sizing.

Free calculator that helps architects and builders verify passive house performance criteria compliance. Checks heating demand (kWh/m²/year), primary energy consumption, airtightness (ACH@50Pa), and thermal comfort standards against PHI, PHIUS, and EnerPHit requirements. Compares your design metrics against rigorous energy performance thresholds and certifies which Passive House class (Classic, Plus, Premium) your project qualifies for.

Free web-based converter for thermal resistance calculations. Converts between imperial R-values and U-factors with optional metric equivalents (RSI and SI U-values). Essential for building code compliance, window specification, and insulation material selection across ASHRAE, IECC, and international standards.

Calculate annual rainwater collection potential, size storage tanks, forecast water demand, and estimate payback period. Accounts for roof area, local rainfall, occupancy/fixture demand, system efficiency, and generates site water budgets for feasibility studies and code compliance documentation.

Free web-based calculator that determines solar heat gain in BTU/hour through windows and skylights based on window area, Solar Heat Gain Coefficient (SHGC), orientation, latitude, and time of year. Outputs hourly solar heat gain, peak loads by window orientation, seasonal comparison, and AC/heating load impact. Uses ASHRAE and ISO 15099 methodology.

Determine how long it takes for solar panels to pay for themselves and estimate total return on investment. Accounts for system costs, local electricity rates, federal/state incentives, panel degradation, inverter replacement, and electricity rate inflation over 25 years.

Free web-based calculator for insulation contractors, estimators, and building teams. Calculates board feet coverage, thermal resistance (R-value), weight, and material costs for spray polyurethane foam (SPF) insulation. Supports both open-cell (R-3.5 to R-3.8 per inch) and closed-cell (R-6.5 to R-7.5 per inch) foams with manufacturer technical data (BASF Spraytite, Huntsman Heatlok, Tiger Foam). Includes waste factor adjustment and whole-wall R-value calculations accounting for framing effects.

Free web-based calculator for assessing linear thermal transmittance (Psi values) at building junctions. Calculates heat loss contribution from thermal bridges, surface temperatures, and condensation risk for roof-wall, wall-floor, corners, and window junctions. Uses standard junction types and construction details from UK SAP/Passivhaus standards with simplified methodology.

Free web-based calculator that determines the overall U-value (thermal transmittance) of roof assembly components using ISO 6946 methodology. Input individual material layers with thermal conductivity and thickness; the calculator automatically accounts for surface resistances and material combinations to produce accurate thermal performance values for design compliance and energy code verification.

Free web-based calculator that determines the U-value (thermal transmittance) of wall assemblies by summing individual layer thermal resistances. Inputs material layers with thicknesses and thermal conductivity; outputs U-value in W/m²K and R-value, with code compliance validation against ASHRAE 90.1 and IECC requirements by climate zone.

Free web-based calculator that estimates the overall thermal transmittance (U-value or U-factor in Btu/hr-sf-°F) of complete window assemblies. Calculates center-of-glass, edge-of-glass, and frame contributions using ISO 10077 and NFRC methodologies. Inputs include glazing type (single/double/triple pane), frame material (aluminum/wood/vinyl/composite), gas fill (air/argon/krypton), low-E coating properties, and spacer type (warm-edge vs. aluminum). Outputs area-weighted U-value, comparison to code minimums (IECC, Passive House), and energy cost savings vs. baseline.