Nucleic Acid Molecular Weight Markers

Nucleic Acid Molecular Weight Markers

Browse our selection of nucleic acid molecular weight markers for precise DNA and RNA size determination in gel electrophoresis. These markers contain nucleic acids of pre-defined molecular weights, serving as essential size standards. Our catalog includes DNA ladders, RNA markers, and various fragments available with or without loading buffers and tracking dyes. Choose from a range of options suitable for agarose and polyacrylamide gels, offering accurate sizing and quantification of double-stranded DNA fragments across different molecular weight ranges. Learn more about DNA ladders or RNA ladders.

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GeneRuler 100 bp DNA Ladder, ready-to-use  Green features
GeneRuler 100 bp DNA Ladder, ready-to-use 100 to 1000 bp is recommended for sizing and approximate quantification of a wide range of double-stranded DNA fragments on agarose or polyacrylamide gels. The ladder is a mixture of chromatography-purified individual DNA fragments.
GeneRuler 1 kb DNA Ladder, ready-to-use  Green features
GeneRuler 1 kb DNA Ladder, ready-to-use, is recommended for sizing and approximate quantification of a wide range of double-stranded DNA on agarose gels. The ladder is a mixture of chromatography-purified individual DNA fragments.
GeneRuler 1 kb Plus DNA Ladder, ready-to-use  Green features
GeneRuler 1kb Plus DNA Ladder, ready-to-use 75 to 20,000bp is recommended for sizing and approximate quantification of a wide range of double-stranded DNA on agarose gels. The ladder is a mixture of chromatography-purified individual DNA fragments.
GeneRuler 50 bp DNA Ladder, ready-to-use  Green features
GeneRuler 50 bp DNA Ladder, ready-to-use, is recommended for sizing and for approximate quantification of a wide range of double-stranded DNA on agarose or polyacrylamide gels. The ladder is a mixture of chromatography-purified individual DNA fragments.
1 Kb Plus DNA Ladder  Green features
Powerful tool for estimating molecular weight of linear, double-stranded DNA fragments
100 bp DNA Ladder  Green features
Invitrogen 100 bp DNA Ladder is designed for sizing and approximate quantification of double-stranded DNA in the range of 100 bp to 2,000 bp.
E-Gel™ Ultra Low Range DNA Ladder  Green features
Ready-to use DNA Ladder for use with routine throughput precast E-Gel™ agarose gels.
RiboRuler Low Range RNA Ladder, ready-to-use 
RiboRuler Low Range RNA Ladder 100-1000 bases, ready-to-use is a mixture of 7 chromatography purified single-stranded RNA transcripts (100-1000 bp long), produced from specific templates that contain a fragment of the pTZ19R polylinker and Lambda phage fragments.
50 bp DNA Ladder  Green features
Invitrogen 50 bp DNA Ladder is designed for sizing and approximate quantification of double-stranded DNA in the range of 50 bp to 2,500 bp.
NoLimits 1500 bp DNA Fragment  Green features
NoLimits is a collection of 36 highly-purified individual DNA fragments ranging from 10 to 20,000 bp. Unlike other vendors, where custom standards are produced by PCR, Thermo Scientific NoLimits DNA fragments are produced using specifically designed plasmids purified by patented technology.
NoLimits 100 bp DNA Fragment  Green features
NoLimits is a collection of 36 highly-purified individual DNA fragments ranging from 10 to 20,000 bp. Unlike other vendors, where custom standards are produced by PCR, Thermo Scientific NoLimits DNA fragments are produced using specifically designed plasmids purified by patented technology.
E-Gel™ 1 Kb Plus DNA Ladder  Green features
Powerful tool for estimating molecular weight of linear, double-stranded DNA fragments
RNA 6000 Ladder 
A set of six RNA transcripts with lengths of 0.2, 0.5, 1.0, 2.0, 4.0, and 6.0kb
E-Gel™ 50 bp DNA Ladder  Green features
Formulated specifically for maximum performance on E-Gel EX gels as well as other E-Gel precast gels
GeneRuler 100 bp DNA Ladder  Green features
GeneRuler 100bp 100 to 1000bpDNA Ladder is recommended for sizing and approximate quantification of a wide range of double-stranded DNA on agarose or polyacrylamide gels. The ladder is a mixture of chromatography-purified individual DNA fragments.
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DNA and RNA Molecular Weights and Conversions
See our nucleic acid isolation and analysis products, Exact M.W. of ssRNA (e.g., RNA Transcript): M.W. = (An x 329.2) + (Un x 306.2) + (Cn x 305.2) + (Gn x 345.2) + 159ª An, Un, Cn, and Gn are the number of each respective nucleotide within the polynucleotide. M.W.
Nucleic Acid Stains, Ladders, and Markers Support
For Research Use Only. Not for use in diagnostic procedures., View all How can I view DNA on my E-Gel® Agarose Gels with SYBR® stain? Do you offer a DNA loading buffer for DNA samples and/or a ladder for electrophoresis? What is the difference between your SYBR® Safe™ Stain and ethidium bromide?
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Product FAQ
How can I get better separation of my bands?
Product FAQ
With the AgriSeq HTS Library Kit, I see high molecular weight material present during sequencing. Why is this?
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