Utilities

Calculate solar panel investment ROI with NPV, IRR, payback period analysis. Includes Federal ITC, state incentives, and 25-year cash flow projections.

Compare total cost of ownership between electric and gas vehicles. Includes purchase costs, fuel savings, maintenance, depreciation, and break-even analysis.

Calculate air conditioning electricity costs based on unit capacity, SEER rating, usage patterns, and regional electricity rates. Includes monthly breakdown, efficiency comparison, and upgrade ROI analysis.

Calculate your personal or business carbon footprint with regional emission factors (EPA, DEFRA, IEA). Includes 8 categories: energy, transportation, diet, flights, shopping, home, water, and waste. GHG Protocol Scope 1-2-3 compliant for businesses.

Compare HVAC system lifecycle costs including equipment, installation, energy, and maintenance. Analyze NPV, payback periods, and CO2 emissions across heat pumps, furnaces, and boilers.

Calculate the recommended BTU capacity for air conditioning or heating based on room size, insulation, climate, and occupancy. Uses EnergyStar guidelines for accurate AC sizing.

Calculate density, mass, or volume from the other two values using the equation ρ = m/V. Includes unit conversions and material density comparisons.

Calculate the apparent temperature (feels like) based on air temperature and relative humidity using NOAA/NWS algorithms. Includes dew point, wet bulb, humidex, and wind chill.

Convert between foot-candles (US) and lux (metric) illuminance units. Compare against IES and EN 12464-1 lighting standards.

Calculate concrete volume and material quantities for slabs, footings, columns, walls, stairs, and cylinders. Includes mix ratios and bag estimates per ACI 318.

Calculate area for rectangles, circles, triangles, trapezoids, and other shapes. Get unit conversions and material estimates for flooring, paint, and tiles.

Calculate stair dimensions including rise, run, angle, and stringer length. Verify building code compliance for IRC, IBC, OSHA, and ADA standards.

Calculate the number of tiles needed for floors, walls, and surfaces. Supports layout patterns, grout spacing, wastage factors, and cost estimates.

Calculate roofing materials for shingles, metal panels, or tiles. Includes pitch adjustment, underlayment, ridge cap, and accessory estimates.

Calculate paint quantities for interior and exterior surfaces. Supports texture adjustments, primer options, opening deductions, and cost estimates.

Calculate gravel volume, weight, and cost for landscaping, driveways, and construction projects. Supports 10+ gravel types with accurate density values.

Calculate Predicted Mean Vote (PMV) and Predicted Percentage Dissatisfied (PPD) for indoor thermal comfort assessment per ASHRAE 55-2020 and ISO 7730 standards.

Calculate Wet Bulb Globe Temperature (WBGT) for occupational heat stress assessment. Includes OSHA/NIOSH threshold limits and work/rest recommendations.