How do I count emissions from employees' mileage claims for business trips in their own cars?
They are Scope 3 Category 6, business travel. Take the kilometres from each claim, split by car or two-wheeler and fuel, and apply a per-km factor or convert to litres with a typical mileage. Commuting to the usual workplace is Category 7, so keep it out.
What to collect
- Kilometres per claim, already on most reimbursement forms.
- Vehicle type: car, two-wheeler, petrol, diesel or CNG.
- Trip purpose, to separate business travel from commuting.
Two ways to calculate
Per-km factors from a published table, or kilometres divided by mileage to get litres, then the fuel factor.
One month of claims
- Petrol cars: 1,200 km at 15 km per litre = 80 L
- 80 L x 2.31 kg = 184.8 kg CO2
What Senseible does here
Senseible reads quantities, dates and units from your bills and invoices and shows the factor and source used on every line.
Sources: GHG Protocol Corporate Value Chain (Scope 3) Standard, UK Government GHG conversion factors for company reporting
Last reviewed 2026-10-22.