SIC Code to NAICS Converter

Convert UK SIC 2007 codes to their approximate US NAICS equivalents. Enter a SIC code or search by industry description.

What Are SIC and NAICS Codes?

SIC codes (Standard Industrial Classification) are used in the UK to classify business activities. The current version is SIC 2007, based on the EU's NACE Rev 2 system. Every UK company must report at least one SIC code when registering with Companies House. NAICS codes (North American Industry Classification System) serve the same purpose in the United States, Canada, and Mexico. NAICS is updated every five years, with the current version being NAICS 2022.

Why Convert Between SIC and NAICS?

• Expanding to the US - UK businesses entering the US market need to identify their NAICS code for government contracts, tax filings, and regulatory compliance
• Market research - comparing industry data across UK and US sources requires matching classification codes
• Investor due diligence - mapping a UK company's sector to its US equivalent for benchmarking
• Trade and export - US customs and trade databases use NAICS codes

Limitations of This Mapping

SIC and NAICS are independent classification systems built on different principles. There is no official crosswalk between UK SIC 2007 and US NAICS. This tool provides approximate mappings based on the closest equivalent industry sectors. SIC 2007 is based on the EU NACE Rev 2 framework while NAICS was developed independently, some UK industries have no direct US equivalent and vice versa, a single SIC code may map to multiple NAICS codes, and service industries in particular are classified differently between the two systems.

Related Tools

• SIC Code Lookup - search and browse all UK SIC 2007 codes
• Free Company Search - search UK companies by SIC code, name, or location
• Company Name Checker - check if a company name is available at Companies House

Frequently Asked Questions

What is the difference between SIC and NAICS codes?

SIC codes classify business activities in the UK, while NAICS codes do the same in the United States, Canada and Mexico. The UK uses SIC 2007 (based on the EU's NACE system), and North America uses NAICS. They are separate systems built on different principles.

Is there an official SIC to NAICS conversion?

No. There is no official crosswalk between UK SIC 2007 and US NAICS, because the two systems were developed independently. This tool provides an approximate mapping to the closest equivalent industry, which should be treated as a guide rather than a definitive match.

Why would I need to convert a UK SIC code to NAICS?

Converting is useful when a UK business expands into the US and needs a NAICS code for tax filings, government contracts or regulatory forms. It also helps with cross-border market research and due diligence, where UK and US industry data need to be compared.

Can one SIC code map to more than one NAICS code?

Yes. Because the two systems group activities differently, a single SIC code can correspond to several NAICS codes, and vice versa. Service industries in particular are often classified differently, so you may need to choose the NAICS code that best fits your specific activity.

Is this SIC to NAICS converter free?

Yes, the converter is free to use. You can enter a SIC code or search by industry description to see its approximate US NAICS equivalent.