Appliance Energy Cost Calculator - 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. New

🌍 Carbon Footprint Calculator - 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. New

Compost Calculator (C:N Ratio) - 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. New

Electricity Generation Cost Calculator - 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. New

EV Charging Time Calculator - Calculate EV charging time for any electric car using Level 1, Level 2, or DC fast charging. Includes a realistic two-phase fast-charging curve, animated battery visualization, cost estimate, range gained, and milestone timeline (50%, 80%, target). New

EV Range Calculator - 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. New

Heat Loss Calculator - 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. New

Home Energy Audit Calculator - 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. New

Solar Panel Calculator - 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. New

Solar ROI Calculator - 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. New

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