Calibro01
Event boundaries
Define the temporal, operational and participant boundary for the event. Record included sources, category exclusions and reasons for those exclusions.
Calculation methodology
Transparent inputs, factors and assumptions.
The platform is designed to make the event boundary, activity data, proxy use, factor references and offset evidence visible. It does not claim universal compliance, certification or guaranteed accuracy.
Method
A precise record from source data to event status.
02
Activity-data hierarchy
Prefer actual activity data such as meter readings and booked room nights. Use organizer estimates next, followed by documented default estimates when necessary.
03
Emission-factor sources
Apply category-appropriate factors from published sources. The current engine records source families for grid energy, fuels, aviation, rail, road, hotels, catering, waste, materials, freight and digital activity.
04
Units and conversions
Convert activity quantities to kilograms of CO₂ equivalent, aggregate source and category totals, and display tonnes of CO₂ equivalent for event-level reporting.
05
Assumptions
Show proxy methods, default values, occupancy assumptions, journey directions and any other choices that materially affect the result.
06
Data quality
Distinguish actual data, organizer estimates, default estimates and excluded sources. Data freshness belongs with the reported result.
07
Attendance distinctions
Keep on-site, virtual, attendee, speaker, staff and supplier activity distinct where their sources or collection methods differ.
08
Planned versus actual
A planning calculation is not a final footprint. Replace forecast inputs with actual post-event records and retain the state of each input.
09
Recalculation process
Recalculate when the boundary changes, material data is corrected or actual records replace estimates. Generate a new report version after material changes.
10
Offset allocation
Allocate carbon-credit quantities against the residual footprint after reduction activity is recorded. Retain project and quantity details.
11
Retirement evidence
Treat purchase, allocation and retirement as separate states. Documented net-zero completion requires the relevant retirement record and evidence.
12
Report versioning
Keep the generated timestamp, underlying event state and version history so a report can be traced to its calculation and evidence.
Current factor families
Published references are attached by category.
- Grid electricity: CEA CO₂ Baseline Database
- Fuel and refrigerants: IPCC-aligned references
- Aviation: ICAO methodology
- Rail and road: transport statistics and factors
- Hotels: HCMI
- Catering: peer-reviewed food impact research
- Waste and freight: DESNZ
- Materials: WRAP, Carbon Trust and ICE
- Digital participation: published data-centre and streaming research
Quality controls
The calculation remains an evidence-based estimate.
Record what is known
Use actual quantities wherever the organizer, venue, supplier or participant can provide them.
Label what is estimated
Keep organizer and default estimates visible so a reviewer can understand uncertainty.
Version material updates
Recalculate and issue a new report version when actual data or offset evidence changes the result.
Start managing your event carbon footprint.
Create the event, calculate emissions, plan reductions and maintain a documented path from residual emissions to retirement.