Coil Sizes in Metal Detectors


When diving into the world of metal detecting, one key component that often catches attention is the coil. It’s not just about having a coil; it’s about having the right coil size for your needs. 

Different sizes offer varied advantages and limitations. Let’s delve into the pros and cons of small coils, the pros and cons of medium-range coils, and finally, the pros and cons of large coils.

Different Coil Sizes And Their Impact

Small Size Coil

Small Coils Small coils, usually under 6 inches in diameter, are like the nimble athletes in the metal detecting world. They’re fast, precise, and can get into tight spots.


  • Precision: Small coils excel in detecting smaller items. They’re great for tiny treasures like gold nuggets or jewelry.
  • Maneuverability: Their size allows them to navigate tight spaces, making them ideal for rocky areas or locations with lots of trash.
  • Less Interference: Due to their size, they’re less affected by ground mineralization.


  • Limited Depth: They might not detect deeper-lying objects.
  • Slow Ground Coverage: Covering vast open areas can be more time-consuming.

Medium Size Coil

Medium-Range Coils Medium coils, ranging from 7 to 9 inches, strike a balance between depth and precision.


  • Versatility: Suitable for a variety of terrains and purposes, from beaches to parks.
  • Decent Depth: They offer a good balance between detecting small objects and reaching moderately deep targets.
  • Coverage: Faster than small coils in covering ground but still offers reasonable precision.


  • Interference: Might pick up more interference from ground mineralization than smaller coils.
  • Missed Tiny Objects: Might not be as precise as small coils for very tiny items.

Understanding Metal Detector’s Coil in detail is essential so you exactly know which coil you need for a specific purpose.

Large Coil

Large Coils Large coils, over 9 inches, are like heavy lifters. They cover ground quickly and can reach deep into the earth.


  • Deep Detection: They can detect objects that are buried deep down.
  • Wide Coverage: Ideal for open areas like beaches, they can cover a lot of ground quickly.
  • Find Larger Items: Especially useful if you’re looking for bigger treasures or relics.


  • Weight: Larger coils can be heavier, leading to fatigue during extended searches.
  • Less Precision: They might overlook small items near the surface.
  • High Interference: Their size might amplify the effects of ground mineralization, leading to false signals.


In the end, coil size matters a lot in metal detecting. The ideal choice often depends on where you’re searching and what you’re hoping to find.

Whether you’re combing a beach, exploring a historical site, or navigating a trash-laden area, understanding the pros and cons of each coil size can greatly influence your success and enjoyment in this rewarding hobby.

Howard rockse

Hey there, I am Howard a deeply committed individual who likes to share my knowledge and insights in this field, having spent over ten years as a metal detectorist.

My experience with GoldXtra has allowed me to provide trustworthy and informative advice to both new and experienced metal-detecting enthusiasts. I’m committed to assisting others in exploring and enjoying the world of metal detecting with the same enthusiasm and dedication that I have.

Howard Rockse
Senior Content Writer at GoldXtra

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