DNA Copy Number Calculator (Concentration → Copies)

DNA Copy Number Calculator (Concentration → Copies) | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Education
Input types: number, select
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The DNA Copy Number Calculator converts DNA concentration and template length into copies per µL using the average molecular weight of 660 g/mol per base pair and Avogadro’s constant. It also reports pmol/µL and, when a sample volume is entered, the total number of DNA copies.

When to use

Estimate plasmid, genome, or amplicon copies per µL from a measured DNA concentration.
Calculate how many template molecules are present in a selected sample volume.
Prepare DNA standards or plan PCR and qPCR template amounts.

How it works

1Enter the DNA concentration and select ng/µL, pg/µL, µg/mL, or µg/µL.
2Enter the total double-stranded template length in base pairs.
3Optionally enter the template volume in µL to calculate total copies.
4The calculator applies copies = concentration in g/µL × Avogadro’s constant ÷ (base pairs × 660) and returns copies/µL and pmol/µL.

Use cases

Convert plasmid miniprep measurements into template copies for PCR or qPCR planning.
Estimate molecular copies in lambda DNA or other long-template standards.
Compare copy concentrations across DNA samples reported in different mass units.

Examples

1. Plasmid miniprep copy estimate

Molecular biology researcher

Background

A plasmid miniprep has a measured concentration of 50 ng/µL and a total length of 5,000 bp.

Problem

The researcher needs the molecular copy concentration and the total copies in a 2 µL template volume.

How to use

Enter 50 for concentration, select ng/µL, enter 5000 bp, and enter 2 µL as the sample volume.

Concentration: 50 ng/µL; Template length: 5,000 bp; Sample volume: 2 µL; Decimal places: 2

Outcome

The result is 9.12×10⁹ copies/µL, 0.0152 pmol/µL, and 1.82×10¹⁰ total copies in 2 µL.

2. Lambda DNA standard calculation

Assay development scientist

Background

A lambda DNA working solution is measured at 10 ng/µL, and lambda DNA has a length of 48,502 bp.

Problem

The scientist wants to determine the copy concentration without calculating total copies for a specific volume.

How to use

Enter 10 for concentration, select ng/µL, enter 48502 bp, and leave the sample volume at 0.

FAQ

What does this DNA calculator calculate?

It converts DNA mass concentration into molecular copies per µL, pmol/µL, and optionally total copies in a specified volume.

Which concentration units are supported?

You can enter ng/µL, pg/µL, µg/mL, or µg/µL.

What template length should I enter?

Enter the total double-stranded length in base pairs, such as a plasmid size, genome size, or amplicon length.

How is total copy number calculated?

The calculator multiplies the copies per µL result by the optional sample volume in µL. Enter 0 to skip this calculation.

Is the result suitable for exact oligonucleotide quantification?

No. The 660 Da per base-pair value is an average intended for plasmids, genomes, and amplicons; exact oligonucleotides require base-specific mass calculations.

Concentration: 10 ng/µL; Template length: 48,502 bp; Sample volume: 0 µL; Decimal places: 2

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Plasmid miniprep copy estimate

2. Lambda DNA standard calculation

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