Environmental Calculators

Find the Clean Air Delivery Rate your air purifier needs. Enter floor area, ceiling height and how clean you want the air to get the required CADR in CFM and m3/h, the air changes per hour, and the AHAM 2/3 benchmark.

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 the levelized cost of electricity (LCOE) per kWh for coal, natural gas, nuclear, solar PV, wind, and hydro using editable capital cost, fuel cost, capacity factor, plant lifetime, O&M, discount rate, and carbon price assumptions.

Calculate EV charging time for any electric car on Level 1, Level 2 or DC fast charging. Includes a realistic two-phase fast-charge curve, an animated battery, a cost estimate, range gained and 50%, 80% and target milestones.

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.

Size a solar charge controller: enter panel specs, series and parallel wiring and battery bank voltage to get the MPPT and PWM amps needed, the cold-weather open-circuit voltage, the voltage class and PV fuse and breaker sizes.

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.

Estimate your annual carbon footprint from transportation, home energy, diet, and shopping. Get personalized reduction tips, visual breakdowns, and compare with national and global averages.