Free UK Sustainability & Carbon Calculators 2026
Carbon footprint, net zero roadmap, solar ROI, EV fleet, plastic packaging tax and green certifications — updated for 2025/26 UK rates and regulations. Free to use, no account needed.
Business Carbon Footprint Calculator
Estimate your business's scope 1, 2 and 3 carbon emissions — energy, travel, supply chain and waste.
Net Zero Cost Roadmap Calculator
Model the investment required to reach net zero by 2030 or 2050 — energy efficiency, renewables and offsets.
Commercial Solar PV ROI Calculator
Return on investment for commercial rooftop solar — system size, output, SEG income and payback period.
EV Fleet Conversion Calculator
Cost and payback of switching your company fleet from petrol/diesel to electric vehicles.
Carbon Offset Cost Calculator
Estimate the cost of offsetting your business's remaining carbon emissions — verified credits vs gold standard.
Green Business Certification Cost
Cost and time to achieve B Corp, ISO 14001, PAS 2060 or ESOS compliance for your business.
Plastic Packaging Tax Calculator
UK Plastic Packaging Tax (£217.96/tonne from April 2024) — eligible weight and annual liability.
Supply Chain Sustainability Score
Score your supply chain sustainability against ESG procurement standards and identify quick wins.
Business Water Saving Calculator
Annual water bill saving from efficiency measures — low-flow fittings, rainwater harvesting, leak detection.
Energy Efficiency Investment Payback
Payback period for LED lighting, insulation, HVAC upgrade and smart metering investments.
UK Sustainability & Green Business Compliance 2025/26
UK sustainability requirements are tightening rapidly. Large companies face mandatory TCFD climate risk disclosure, SECR carbon reporting and (from 2026) mandatory transition plans aligned with the UK Transition Plan Taskforce. The Plastic Packaging Tax now charges £217.96/tonne on packaging with less than 30% recycled content. Meanwhile, the Smart Export Guarantee makes commercial solar increasingly attractive, and the 0% BIK rate for electric company cars (rising to just 3% in 2025/26) continues to drive EV fleet adoption. These calculators help businesses model their costs, obligations and payback periods across all major green compliance areas.
Frequently Asked Questions
- Is carbon reporting mandatory for UK businesses?
- Carbon reporting is mandatory for UK quoted companies and large unquoted companies (over 500 employees) under SECR (Streamlined Energy and Carbon Reporting). Large companies must also report under TCFD (Task Force on Climate-related Financial Disclosures). SMEs are not legally required to report but many supply chains now expect voluntary disclosure.
- What is the UK Plastic Packaging Tax rate in 2024/25?
- The UK Plastic Packaging Tax rate is £217.96 per tonne from 1 April 2024, increased from £210.82 in 2023/24. It applies to plastic packaging manufactured in or imported into the UK with less than 30% recycled content by weight. Businesses producing or importing less than 10 tonnes per year are exempt.
- What are the costs of B Corp certification in the UK?
- B Corp certification costs vary by company size. Annual fees typically run £1,500–£5,000 for SMEs. The certification process takes 12–18 months and requires a minimum B Impact Assessment score of 80. Additional costs include staff time, third-party verification and potential operational changes to meet standards.
- What is the UK electricity grid carbon factor?
- The UK electricity grid carbon factor was approximately 0.207 kgCO2e/kWh in 2023, down significantly from 0.52 kgCO2e/kWh in 2012 as renewable generation has grown. DEFRA publishes updated conversion factors annually each June. Using the correct year's factor is important for accurate Scope 2 emissions reporting.