Carbon reporting: software or spreadsheets?

Spreadsheets vs. platforms: the short version

Carbon reporting comes down to data, and this is exactly where spreadsheets fall short. A typical spreadsheet calculation might take total spend on electricity and multiply it by a single industry-average emission factor. By contrast, a carbon accounting platform can apply hundreds of thousands of verified emission factors across scientific databases, automatically adjusting for units, inflation, currency, renewable content, and more. This depth of calculation delivers results that are both granular and scientifically robust. In this article, we’ll examine why spreadsheets can no longer keep up with the demands of regulators, auditors, and investors, the risks they create for businesses, and how dedicated platforms like Normative turn carbon accounting into a reliable, scalable, and strategic advantage.

It’s easy to understand why many businesses started to use spreadsheets to conduct and manage their carbon emissions calculations. For those embarking upon their carbon accounting journeys, familiarizing themselves with evolving regulatory requirements and multiple methodologies, Excel spreadsheets represented an easy solution. All employees had access to it as well as a degree of experience using the program, and, importantly, it didn’t require extra budget. 

Yet, as businesses have to contend with fast-changing regulation and increasingly complex requirements from customers and investors, the humble spreadsheet is putting big business opportunities at risk.

As so many mission-critical areas and strategic business decisions are linked to data from spreadsheets, researchers from the Dundalk Institute of Technology audited 50 real-world operational spreadsheets, finding 94% to contain errors. When these errors are applied to carbon accounting, such deficiencies can have a huge impact on a business. Inaccurate carbon emissions data can affect:

• A company’s ability to meet compliance requirements
• A business’ chances of avoiding unintentional greenwashing
• The ability to make good business decisions based on reliable data

So, how do spreadsheets leave businesses exposed to these risks? 

What are the risks of spreadsheet-based carbon accounting?

Limited accuracy of carbon data

Whether your in-house team or a consultant is running the spreadsheet, the carbon emissions calculations conducted are often basic, using only industry-average emission factors (EFs). There’s no guarantee that the latest, most relevant EFs will be used or maintained, or that factors like inflation adjustments will be accounted for – such simple calculations lack the granularity that auditors and frameworks require. 

Lack of traceability is another significant challenge posed by manual spreadsheets. Auditors need to see evidence of a scientific and transparent methodology for calculating emissions and be able to track emissions from source to report. Especially as carbon reporting efforts scale and businesses address their scope 3 supply chain emissions, delivering a full audit-trail manually quickly becomes unmanageable.

Carbon data lacks granularity for regulators

The Science Based Targets initiative for Forest, Land and Agriculture and the Greenhouse Gas Protocol land-sector guidance are good examples of how regulations and frameworks are increasingly demanding more granularity in the reporting of carbon emissions. They require businesses to be able to isolate land-related emissions, meaning they want the breakdown of the emissions related to the product, for example, keeping the land-related emissions of producing a block of cheese separate from those incurred by transporting and packaging the product. At this degree of complexity, especially when making calculations at scale, automation is a must to not only save time, but to make sure that errors are minimized.

Unintentional greenwashing

Accessibility to anyone across a business could initially be seen as an advantage for businesses looking to run carbon accounting calculations through spreadsheets. Yet, opening up this access actually means that many staff who aren’t trained in either working with spreadsheets, or who have any experience in carbon accounting, are free to work on important calculations and data input. Not only does this open the door to user error when inputting data or performing calculations, version control can also quickly get out of hand. These errors can lead to businesses greenwashing, even if unintentional. Inaccurate data can lead to the setting of unrealistic targets that cannot be fulfilled and to companies claiming, for example, that they are carbon neutral, without accounting for emissions, often within their supply chain, that they haven’t tracked.

Business decisions informed by unreliable data

Inaccurate or incomplete carbon emissions data can impact a business beyond non-compliance. Increasingly big businesses are expecting detailed carbon emissions reporting as a pre-requisite for entering a tender process with them. If a business can’t quickly share reports on their carbon footprint in enough detail, new business opportunities can be lost.  For example, the UK government has introduced the Procurement Policy Note (PPN) 06/21, which requires businesses to publish and maintain a Carbon Reduction Plan to be eligible to bid on central government contracts worth over £5 million. As a result, there is an urgent need for businesses that this affects to address the granularity of their carbon emissions reporting. 

There are also hidden costs related to spreadsheet-based carbon accounting – when businesses have to spend time correcting user error and trying to exert a degree of quality control over data gathered in multiple formats, entered by multiple staff members, costs start to mount up.

Why leave spreadsheets behind for carbon reporting software?

Transitioning from spreadsheets to working with a specialist carbon accounting provider is about negating risks on one hand, but there are also significant opportunities that businesses can tap into by refining their approach.

• Tech deficiencies are hindering timely, reliable carbon reporting: 96% of sustainability decision-makers see balancing the need to submit accurate data in a timely manner as crucial to their business, according to Normative’s 2025 Carbon Accountability Report. However, 63% say they have insufficient staff or technological resources to ensure both.
• Better data management can help integrate carbon insights into business decisions: according to a KPMG study of enterprise businesses globally, 45% see improving data management and reporting capabilities as helpful in integrating ESG goals, of which carbon reporting is a critical part, with business objectives. Businesses are backing this hypothesis up with investment: 59% of leading organizations already use advanced data systems for ESG reporting, while 90% planned to increase ESG investment within 3 years. Of this proportion that had marked this as an area for investment, the second highest priority area to dedicate spend was on specific software.
• Comprehensive carbon reporting can increase revenue potential: 90% of FTSE 100 & 74% of UK manufacturers include ESG in tenders – being able to deliver timely, accurate and increasingly granular carbon reporting will play a crucial role in winning new business.

So, optimizing a business’ carbon accounting practices is as much about growth and improving resilience as it is about meeting compliance requirements. The cost of rigorous carbon accounting is minimal compared to the business risk of not doing it.

Compared: Normative versus spreadsheets

Once the business case is built for why an organization needs to work with a carbon accounting solution, the focus moves on to how the chosen vendor can improve on the existing spreadsheet-based system. 

We understand why spreadsheets act as a starting point for many businesses. But when they stop scaling and can’t handle a growing number of suppliers, audit expectations and changes to regulation, dedicated support is essential. 

Why Normative?

• 100% audit record with our customers
• 349,000 emissions factors
• 18 scientific databases
• 6-monthly taxonomy refreshes to stay true to the science

Where spreadsheets lack the granularity that auditors require…

Normative’s carbon accounting platform performs multiple calculations on every row of data. 

Example:

A typical spreadsheet-based electricity calculation, often conducted by consultants, would account for: 

Total spend on electricity x industry emission factor = xxx kg CO₂e

The same calculation in Normative applies quantity conversion, information adjustment, currency conversion, conversion factors, price indexing, renewable pet lookup, measurement access and more. 

Where spreadsheets cannot scale…

Normative visualizes all data in a centralized system of record. Varied datasets are aggregated into a single, coherent platform, enhancing the efficiency of sustainability reporting and ensuring data integrity across systems. Data is consistent from one year to the next and can be accessed by all stakeholders, no matter where they are in the business.

Where spreadsheets lack traceability…

Normative provides Advanced GHG-compliant methodology. This allows for full auditability at calculation level to avoid accounting issues and claims of greenwashing. It also removes the need from having to restate past footprints.

Where spreadsheets facilitate user errors…

Normative automatically validates data and then maps it to the correct categories along with the corresponding emission factors.

Where spreadsheets often lack a rigorous quality assurance program…

Normative offers AI-powered data matching and quality assurance to accurately calculate comprehensive carbon footprints.