Environmental Calculators

Enter floor area, ceiling height, and a cleanliness target to get the required CADR and the air changes per hour.

Calculate the daily, monthly, and annual electricity cost of any household appliance from wattage, daily hours of use, local electricity rate, quantity, and optional standby power.

Calculate the carbon-to-nitrogen (C:N) ratio of a compost pile from brown and green material proportions. Get a visual recipe, ideal 25:1 to 30:1 target guidance, and practical correction tips for fast, odor-free composting.

Compare cost per kWh for coal, gas, nuclear, solar, wind and hydro from capital cost, fuel, capacity factor, life, operations, discount rate and carbon price.

Enter battery size, current and target charge, and charger power, to get time and cost, range gained, and the 50%, 80% and target points.

Estimate the real-world range of any electric vehicle from battery capacity, efficiency, speed, temperature, climate use, terrain and driving mode. Visual battery gauge, factor breakdown and charging cost estimate.

Compare the running cost of natural gas against electricity for heating, water heating, cooking or drying. Enter fuel prices and appliance efficiencies to see cost per useful kWh, the break-even price, savings and a CO2 comparison.

Calculate building heat loss through walls, windows, doors, and roof surfaces from R-value or U-value, area, and indoor/outdoor temperature difference. See BTU/hr, watts, surface shares, and the largest envelope heat-loss path.

Estimate annual home energy consumption in kWh equivalent, heating and cooling load, energy cost, end-use breakdown, and the largest savings opportunities from home size, insulation, climate zone, HVAC equipment, and major appliance usage.

Estimate solar panel energy output, roof-limited system size, required kW, panel count, annual kWh generation, and long-term electricity bill savings from sunlight hours, roof area, panel wattage, and local electricity rates.

Calculate residential solar payback period, ROI, and lifetime net savings from system cost, federal and state incentives, annual production, panel degradation, electricity rate inflation, and maintenance assumptions.

Estimate household water consumption in gallons or liters from people, shower and toilet fixtures, laundry, dishwasher loads, faucets, outdoor use, and daily usage habits.

Enter travel, home energy, diet, and shopping habits to get your estimated annual carbon footprint with reduction tips and comparisons to global averages.