Input Year
Heavy vehicles: load
Consider cold start?
Consider degradation?
Average trip length (km)
(8 to 25)
Ambient temperature ℃
(-10 to 30)
Input Average Speeds (km/h)
(10 to 110)
(10 to 110)
(6 to 86)
(6 to 86)
Total: 100.0%
You can adjust the weighted percentage
Default % %
Car < 3.5 t Petrol 0
Diesel 0
Hybrid 0
Plugin hybrid 0
Electric 0
LCVs < 3.5 t Petrol 0
Diesel 0
Hybrid 0
Plugin hybrid 0
Electric 0
Buses Urban <= 12 t Diesel 0
Urban 12-18 t 0
Coach 12-18 t 0
> 3.5t Electric 0
Default % %
HCVs Rigid 3.5-7.5 t Diesel 0
7.5-10 t 0
10-20 t 0
20-25 t 0
25-30 t 0
> 30 t 0
HCVs Articulated 14-20 t Diesel 0
20-28 t 0
28-34 t 0
34-40 t 0
40-50 t 0
> 50 t 0
HCVs Electric < 10 t Electric 0
> 10 t 0
Some users may prefer to download the complete set of precalculated emission factors (0.5 Gb SQLLite database)
Step One: Download and save a copy of the Microsoft Excel template
Step Two: Populate the template
Step Three: Enter your e-mail address
Step Four: Upload populated template
Step Five: Check calculation progress
Process key
Results - fleet weighted emissions factors
CO 0 g/km
CO₂-e 0 g/km
VOC 0 g/km
NOx 0 g/km
NO₂ 0 g/km
PM₂.₅ 0 Exhaust g/km
PM₁₀ 0 Brake&Tyre g/km
PM₂.₅ 0 Brake&Tyre g/km
FC 0 I/100km
CO₂ 0 g/km
N₂O 0 g/km
CH₄ 0 g/km
  1. The information available on or through this website is intended to provide general information to the public and all reasonable measures have been taken to ensure the quality and accuracy of that information. However, Waka Kotahi:
    • may change, delete, add to or otherwise amend information contained on this website without notice
    • is not responsible for the content of other websites linked to or referenced from this website. (Waka Kotahi neither endorses the information, content, presentation or accuracy of such other websites, nor makes any warranty, express or implied, regarding these other websites).
  2. The contents of this website should not be construed as legal advice and, before acting on any information, you should take specific advice from qualified professional people.
  3. Reference to any specific commercial product, process or service, whether by trade name, trademark, manufacture or otherwise, does not constitute an endorsement or recommendation by Waka Kotahi.
  4. This site may also contain the advice, opinions and statements of various information providers. Waka Kotahi does not represent or endorse the accuracy or reliability of any advice, opinion, statement or other information provided by any information provider, any user of this site or any other person or entity. Reliance upon any such advice, opinion, statement or other information, shall be at the user's own risk.
  5. Waka Kotahi does not accept any responsibility or liability whatsoever, whether in contract, tort, equity or otherwise, for any action taken as a result of reading, or reliance placed on Waka Kotahi because of having read, any part, or all, of the information in this website or for any error, inadequacy, deficiency, flaw in or omission from the information provided in this site.
  6. Each page on this website must be read in conjunction with this disclaimer and any other disclaimer that forms part of the page or website.

You may browse and access the vast majority of information contained in this website without providing any personal information.

We have software to track which pages are visited, to help us identify the most popular areas of our website. The information is aggregated and we can't identify individual visitors.

Where you voluntarily provide personal information (for example, through email feedback or by completing a form), we’ll use that information only for the purpose for which it was given.

We use third party providers to store and process some information that we hold. We store some personal information in Microsoft Azure data centres in Australia. We also use Microsoft Office 365 for our email and other office productivity applications. This means that the personal information we hold may be transferred to, or accessed from, countries other than New Zealand.

We take reasonable steps to ensure the personal information that we hold is protected against loss, unauthorised access and disclosure or any other misuse in accordance with the Privacy Act 2020, including information stored or processed by our third-party providers. We have assessed and are satisfied that, for example, Microsoft has adequate security and privacy safeguards in place to protect information it holds on our behalf.

When you subscribe to one of our project update alerts or newsletters, we collect your name and email address. Once subscribed, your details will be added to a mailing list that is used to distribute e-newsletters.

Waka Kotahi sometimes uses Campaign Monitor, a dedicated e-newsletter communication tool to easily manage and distribute project news. Campaign Monitor is based in Australia and may use servers based in the United States of America and Europe, and therefore your information may be disclosed or used in such countries. Campaign Monitor will use your information in accordance with its privacy policy.

Campaign Monitor privacy policy(external link)

Waka Kotahi monitors the effectiveness of these newsletters using analytical tools offered by Campaign Monitor that collect the following information:

There is no ability to collect information beyond this, or to track the recipient outside of a specific e-newsletter. Once the recipient has closed the newsletter, no further information can be collected.

Waka Kotahi holds a variety of information. When dealing with information, Waka Kotahi complies with the relevant information legislation, such as the Official Information Act 1982 and the Privacy Act 2020. Where the information is part of a public register, there are specific laws that require Waka Kotahi to grant access to certain parts of that information.

You have the right to request access to and correction of that information.

Note: change of address information is used to update registers that legislation says must be publicly available. Submissions are publicly available too.

If you have any concerns about personal information that we hold, please write to:

Privacy Officer
Waka Kotahi NZ Transport Agency
Private Bag 6995
Wellington 6141

Alternatively you can send an email to

This pre-generated result set aims to help the user consume the fleet weighted emission factor data for those common scenarios. An SQLite database has been generated using VEPM 7.0 calculation logic. The database contains the following scenarios matrix.

Below are parameters with the default value

Total Scenario = (50 years * 101 average speeds * 7 gradients * 56 temperatures) = 1,979,600 Scenarios
Click here to download results for 1,979,600 Scenarios

The SQLite database contains a table called "efc", It stored calculated total emission factors for each secenario.

How to view the result
You can open SQLite files using DB Browser for SQLite. You can download it from this link. This software is available for macOS, Windows, Linux(ArcLinux, Debian, OpenSUSE, Fedora), FreeBSD, etc.

Here is the tutorial on how to open database file.
For information about SQLite please go to SQLite Website.

Below is the efc table schema
Column name Data type Length Description
yearFleet smallint Fleet year
speedCar smallint CAR user specified average speed
speedLcv smallint LCV user specified average speed
speedHcv smallint HCV user specified average speed
speedBus smallint HCV user specified average speed
roadSlope float Road slope (-6%, -4%, -2%, 0%, 2%, 4%, 6%)
vechicleLoad float Heavy vehicle load (0%, 50%, 100%)
degradationYn varchar 3 Include degradtion factor (yes/no)
coldStartYn varchar 3 Include cold start penalty emissions (yes/no)
avgTripLength float Average trip length - default value 9.1
temperature float Average ambient temperature (-10 to 30 deg Celcius, for cold start emission penalty)
Category varchar 50 Specifies fleet categories. See Fleet Category Matrix Below
sortNo smallint The "SortNo" field can be used to arrange the categories in a specific order, resulting in a report that is similar to the Excel output report.
ratioFleet float Proportion each subcategory has within the fleet
co float CO g/km
co2e float CO₂-e g/km
voc float VOC g/km
nox float NOx g/km
no2 float NO₂ g/km
n2o float N₂O g/km
pmExhaust float PM₂.₅ Exhaust g/km
pm10BT float Brake and Tyre PM₁₀ output in g/km
fc float FC I/100km
co2 float CO₂ g/km
ch4 float CH₄ g/km
ec float EC (Energy Consumption)
pm25BT float Brake and Tyre PM₂.₅ output in g/km
Fleet Category Matrix
Vehicle Categories Description
Fleet average emissions factors Average emissions factor for a scenario
Light vehicle fleet average emission factors Average emissions factor for cars and LCVs
Petrol Cars
Diesel Cars
Petrol LCVs
Diesel LCVs
Hybrid (Cars and LCVs)
Plug-in hybrid (Cars and LCVs)
Heavy vehicle fleet average emission factors Average emissions factor for Rigid, Articulated, HCVs
Diesel Rigid 3.5-7.5 t
Diesel Rigid 7.5-10 t
Diesel Rigid 10-20 t
Diesel Rigid 20-25 t
Diesel Rigid 25-30 t
Diesel Rigid > 30 t
Diesel Articulated 14-20 t
Diesel Articulated 20-28 t
Diesel Articulated 28-34 t
Diesel Articulated 34-40 t
Diesel Articulated 40-50 t
Diesel Articulated >50 t
Electric HCVs
Bus fleet average emission factors Average emissions factor for bus, coaches
Diesel Urban Buses Midi <=15 t
Diesel Urban Buses Standard 15-18 t
Diesel Coaches Standard <=18 t
Electric Buses
User can use the efc table to generate the result as below