keyword

21 cms

Monthly search volume and cost-per-click data for "21 cms" in US.

$ curl "https://api.seodata.dev/v1/keyword?q=21+cms&country=us" +--------------+------------------+ | volume | 3,600 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-06-07 | +--------------+------------------+

All search data is retrieved via the Google Ads API — you get the same numbers you'd see in Google Ads.

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword	volume	cpc	overlap
cms	165,000	$12.72	2/20
21 centimeters to inches	74,000	$0	2/20
21 cm in inches	74,000	$0	2/20
21 cm to inches	74,000	$0	2/20
21cm to inches	74,000	$0	2/20
cms medicaid	1,900	$15.32	3/20
cms 21	140	$0	3/20
cms-21	140	$0	3/20
cms title 21	70	$3.33	3/20
cms chapter 21	40	$0	6/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://api.seodata.dev/v1/keyword?q=21+cms&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt