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DNA Markers & Ladders

NEB offers a variety of DNA Ladders with sizes ranging from 25 bp to 48.5 kb for use in agarose gel electrophoresis. NEB also offers a wide range of double-stranded DNA molecular weight markers for conventional agarose gel electrophoresis. These standards have a size range of approximately 10 bp to 23,000 base pairs. Ladders are also available for pulse-field gel electrophoresis.

NEB’s DNA ladders are offered in 4 convenient formats:

Conventional (with no loading dye)
  • Available in a wide variety of size ranges
  • Most economical of the 4 formats
Quick-Load® Purple format
  • Ready-to load
  • Contains a non-fluorescing purple dye which does not cast a UV shadow
  • Optimized to create sharp, tight bands
  • Available for the Low Molecular Weight50 bp,100 bp,1 kb, and 2-log DNA Ladders.
  • Value pricing
Quick-Load format
  • Ready-to-load
  • Contains bromophenol blue dye
Tri-Dye® format
  • Contains 3 dyes to monitor migration
  • Available in 100 bp, 1kb and 2-log sizes

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The typical pattern generated by each of our markers and ladders is shown below. Fragment sizes are indicated alongside of the image. Relative mass values are also shown, when appropriate.

UV Shadow Comparison

The new Gel Loading Dye, Purple (6X) (Lane 1) included in the Quick-Load Purple 1 kb DNA Ladder does not cast a UV shadow over the underlying bands, unlike the Gel Loading Dye, Blue (6X) (Lane 2).

FAQs for DNA Markers & Ladders

Protocols for DNA Markers & Ladders

    Other Tools & Resources


  • PCR Brochure

    The PCR brochure provides product information on the wide range of DNA polymerases available from NEB, including tools for selection and troubleshooting tips.

  • Protein Expression & Purification Brochure

    The Protein Expression and Purification brochure provides information on the advanced tools for protein expression and purification offered by NEB.


  • DNA Ladders are supplied with 1 vial of Gel Loading Dye
  • Suitable for analysis of a wide range of DNAs
  • Uniform band intensities and convenient band spacing
  • Easy-to-identify reference bands
  • DNA Ladders can be used for sample quantitation

TriDye and Quick-Load Formats

  • TriDye™ Ladders: 1 kb, 100 bp and 2-Log DNA Ladders are available in ready-to-load format containing xylene cyanol FF, bromophenol blue and orange G.
  • Quick-Load® Ladders: 1 kb, 1 kb extend, 50 bp, 100 bp, 2-Log, Low Molecular Weight DNA Ladders and PCR marker are available in ready-to-load format containing either non-fluorescing purple dye or bromophenol blue as a tracking dye.

Comparison of NEB to Other Commercially Available DNA Ladders

Comparison of the NEB 1 kb (left) and 100 bp (right) DNA Ladders to other commercially available DNA Ladders. Note: The 500 bp DNA Ladder from Roche is used in the 1 kb DNA Ladder comparison.

DNA Markers & Ladders Selection Chart

Legal Information

This product is covered by one or more patents, trademarks and/or copyrights owned or controlled by New England Biolabs, Inc (NEB).

While NEB develops and validates its products for various applications, the use of this product may require the buyer to obtain additional third party intellectual property rights for certain applications.

For more information about commercial rights, please contact NEB's Global Business Development team at

This product is intended for research purposes only. This product is not intended to be used for therapeutic or diagnostic purposes in humans or animals.