Sustainability Score Calculator Formula

Understand the math behind the sustainability score calculator. Each variable explained with a worked example.

Use the Sustainability Score Calculator

Formulas Used

Sustainability Score

total_score = weighted_score

Lowest Score

lowest_area = transport_score

Highest Score

highest_area = waste_score

Improvement Potential

improvement_potential = 100 - weighted_score

Variables

VariableDescriptionDefault
energy_scoreEnergy Score (renewables, efficiency)(0-100)50
transport_scoreTransport Score (EV, public transit)(0-100)40
food_scoreFood Score (local, plant-based)(0-100)55
waste_scoreWaste Score (recycling, composting)(0-100)60
consumption_scoreConsumption Score (reuse, reduce)(0-100)45
weighted_scoreDerived value= energy_score * 0.25 + transport_score * 0.25 + food_score * 0.20 + waste_score * 0.15 + consumption_score * 0.15calculated

How It Works

How to Calculate Your Sustainability Score

A sustainability score rates your lifestyle across five key impact areas.

Formula

Score = Energy(25%) + Transport(25%) + Food(20%) + Waste(15%) + Consumption(15%)

Rating Each Area (0-100)

  • Energy: Renewable energy use, efficiency upgrades, smart thermostats
  • Transport: EV/hybrid, public transit, biking, less flying
  • Food: Plant-based, local, minimal waste
  • Waste: Recycling, composting, zero-waste practices
  • Consumption: Buy less, buy used, repair, quality over quantity

    • Worked Example

    Rate yourself: Energy 50, Transport 40, Food 55, Waste 60, Consumption 45.

    energy_score = 50transport_score = 40food_score = 55waste_score = 60consumption_score = 45
    1. 01Energy: 50 * 0.25 = 12.5
    2. 02Transport: 40 * 0.25 = 10.0
    3. 03Food: 55 * 0.20 = 11.0
    4. 04Waste: 60 * 0.15 = 9.0
    5. 05Consumption: 45 * 0.15 = 6.75
    6. 06Total: 12.5 + 10.0 + 11.0 + 9.0 + 6.75 = 49.3

    Frequently Asked Questions

    What is a good sustainability score?

    Above 70 is excellent, 50-70 is good with room for improvement, 30-50 is average, and below 30 indicates significant opportunity for change.

    Which area should I focus on first?

    Focus on your lowest-scoring area for the biggest improvement. Energy and transport often offer the largest impact because they directly affect carbon emissions.

    Can anyone reach 100?

    A perfect score would require off-grid renewable energy, zero-emission transport, entirely plant-based local diet, zero waste to landfill, and minimal consumption. Very few people achieve this, but every improvement helps.

    Ready to run the numbers?

    Open Sustainability Score Calculator