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FREE RESEARCH CALCULATOR

DNA/RNA Copy Number Calculator

Convert nucleic-acid mass and length into moles and estimated molecule copy number for DNA or RNA.

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CORE EQUATIONcopies = mol × Nₐ
Unit-awarePractical checksLocal processingHow results are handled →
READY TO CALCULATEExample values are included so you can test the workflow immediately.
MOLECULARDNA / RNA

Nucleic acid converter

Estimate molecular weight, molar amount and molecule count from nucleic-acid length and mass.

copies = mass / MW × Nₐ
Molecule type
BENCH RECIPE✓ READY
3.04e+9copiesmolecules
0.005051pmolmolar amount
0.5ng/µLmass concentration

Estimated amount: 0.005051 pmol; solution concentration: 0.5 ng/µL.

⚠ Molecular weight is an estimate using average residue masses (dsDNA ≈660 Da/bp, ssDNA ≈330 Da/nt, RNA ≈340 Da/nt). Use the exact sequence MW when precision matters.
MW ≈ 1980 kDa
WHAT IT DOES

From formula to a bench-ready decision.

Estimate DNA or RNA molecule count from measured mass and sequence length.

Tossora Lab keeps units, intermediate values, and practical preparation checks visible so a mathematically correct answer is easier to translate into an experimental workflow.

BUILT-IN CHECKS

What Tossora Lab checks.

  • Uses the defined Avogadro constant.
  • Separates DNA and RNA molecule-mass assumptions.
  • Returns both molar amount and estimated copies.
BENCH NOTES

Before you use the result.

  • Treat copy number as an estimate when sample composition or molecular form is uncertain.
  • Use the length and molecule type that match the actual analyte.

Research use only. Verify critical calculations, reagent specifications, route or instrument limits, and procedures against your approved protocol and institutional requirements.

COMMON USES

When this calculator is useful.

  • Estimating DNA molecules from mass and sequence length.
  • Converting RNA mass to approximate molar amount and copy number.
  • Checking mass concentration alongside estimated molecular amount.
WORKED CONTEXT

Example: estimating plasmid or amplicon copies

Choose the nucleic-acid type, enter its length and measured mass, then provide the solution volume. Tossora Lab estimates molecular weight from average residue mass and converts the amount to moles and molecule count.

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FAQ

Questions researchers often ask.

Is the copy number exact?

It is an estimate based on average residue masses. Sequence-specific molecular weight, sample purity and molecular form can matter when higher precision is required.

Why are DNA and RNA calculated differently?

The calculator uses different average mass assumptions for dsDNA, ssDNA and RNA, reflecting their different molecular composition.

MORE FREE TOOLS

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PCR & qPCR Master Mix Calculator→qPCR ΔΔCt Calculator→Molarity Calculator→Solution Preparation Calculator→
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