🌍 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

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