RNA Concentration Calculator (A260, 1 OD = 40 µg/mL)

RNA Concentration Calculator (A260, 1 OD = 40 µg/mL) | 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
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The RNA Concentration Calculator estimates RNA concentration from A260 absorbance using c = A260 × dilution factor × 40 ÷ path length. It reports µg/mL, ng/µL, optional total yield, and whether the absorbance is within the approximate 0.1–1.5 linear range. Educational use only.

When to use

Estimate RNA concentration from a blanked A260 measurement.
Convert a diluted spectrophotometer reading into the concentration of the original sample.
Calculate total RNA yield when the elution volume is known.

How it works

1Enter the measured A260 absorbance, dilution factor, and optical path length in centimeters.
2The calculator applies the RNA conversion factor of 40 µg/mL per OD at 260 nm.
3It converts the result to ng/µL and calculates total micrograms when a sample volume is provided.
4It checks whether A260 is within the approximate 0.1–1.5 linear range and reminds users that pure RNA typically has an OD260/280 near 2.0.

Use cases

Quantifying total RNA after extraction or elution.
Adjusting concentrations for downstream molecular biology experiments.
Checking whether an A260 measurement falls within the calculator's approximate linear range.

Examples

1. Total RNA yield from a diluted sample

Molecular biology researcher

Background

A 1:5 diluted total-RNA sample gives an A260 reading of 0.4 using a 1 cm cuvette. The final elution volume is 250 µL.

Problem

Calculate the original RNA concentration and total amount recovered.

How to use

Enter A260 = 0.4, dilution factor = 5, path length = 1 cm, and sample volume = 250 µL.

{"a260":0.4,"dilutionFactor":5,"pathLengthCm":1,"sampleVolumeUl":250,"decimalPlaces":2}

Outcome

The result is 80 µg/mL, or 80 ng/µL, with a total yield of 20 µg. The reading is within the approximate 0.1–1.5 linear range.

2. Low A260 reading flagged below the linear range

Research laboratory technician

Background

An undiluted RNA sample measures A260 = 0.08 in a 1 cm cuvette, with a 50 µL sample volume.

Problem

Estimate the concentration while identifying whether the absorbance is suitable for reliable UV quantitation.

How to use

Enter A260 = 0.08, dilution factor = 1, path length = 1 cm, and sample volume = 50 µL.

FAQ

What formula does the calculator use?

It uses concentration = A260 × dilution factor × 40 ÷ path length in cm.

Why is the RNA factor 40?

For this calculation, 1 OD at 260 nm is treated as 40 µg/mL of RNA.

How is ng/µL related to µg/mL?

The values are numerically equal: 1 µg/mL equals 1 ng/µL.

When should I enter a sample volume?

Enter the total elution volume in µL when you want the calculator to estimate total RNA yield.

What does a reading outside 0.1–1.5 mean?

It is outside the approximate linear range; low readings may be less reliable, while high readings may require appropriate dilution.

{"a260":0.08,"dilutionFactor":1,"pathLengthCm":1,"sampleVolumeUl":50,"decimalPlaces":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. Total RNA yield from a diluted sample

2. Low A260 reading flagged below the linear range

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