Ligation Insert:Vector Molar Ratio Calculator

Ligation Insert:Vector Molar Ratio Calculator | 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: select, number
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The Ligation Insert:Vector Molar Ratio Calculator helps plan DNA ligation reactions by calculating the insert mass needed for a target molar ratio or checking the actual ratio from vector and insert masses. It also reports pmol values, recommended ratio bands, and optional nM concentrations from the reaction volume.

When to use

Calculate the insert mass required for a chosen insert:vector molar ratio.
Check whether existing vector and insert masses fall within the recommended ratio range.
Estimate vector and insert concentrations in nM when the total reaction volume is known.

How it works

1Choose Solve insert mass to calculate the required insert mass, or Check actual ratio to compare two supplied masses.
2Enter the vector size, vector mass, insert size, and target ratio or insert mass.
3The calculator converts DNA masses and fragment sizes to pmol and determines the insert:vector molar ratio.
4Optionally enter the reaction volume to calculate vector and insert concentrations in nM.

Use cases

Planning a standard cloning ligation with a defined insert:vector ratio.
Checking whether measured DNA masses match a recommended ligation range.
Comparing DNA end concentrations in a specified ligation volume.

Examples

1. 3:1 ligation setup for a 1 kb insert

Molecular biology student

Background

A 3,000 bp vector will be ligated with a 1,000 bp insert using 100 ng of vector and a 3:1 molar ratio.

Problem

Find the insert mass required and review the resulting pmol and nM values.

How to use

Select Solve insert mass, then enter 3,000 bp vector size, 100 ng vector mass, 1,000 bp insert size, ratio 3, and a 20 µL reaction volume.

mode: solveInsert; vectorSizeBp: 3000; vectorMassNg: 100; insertSizeBp: 1000; ratio: 3; reactionVolumeUl: 20

Outcome

The calculator returns 100 ng insert, 0.051 pmol vector, 0.154 pmol insert, and concentrations of 2.564 nM vector and 7.692 nM insert.

2. Check a low-ratio ligation before setup

Cloning researcher

Background

A reaction uses 200 ng of a 4,000 bp vector and 30 ng of a 750 bp insert.

Problem

Determine whether the existing DNA masses meet the recommended ratio for the insert size.

How to use

Select Check actual ratio and enter 4,000 bp vector size, 200 ng vector mass, 750 bp insert size, and 30 ng insert mass.

FAQ

What formula does the calculator use?

Solve mode uses insert mass = target ratio × vector mass × (insert size ÷ vector size).

What does Check actual ratio do?

It uses the supplied vector and insert masses and reports their actual insert:vector molar ratio.

What ratio is recommended for a 750 bp insert?

The recommended band is 3–5:1 for inserts from 200 to 999 bp.

When are nM concentrations calculated?

Enter a reaction volume greater than 0 µL. Enter 0 to skip concentration calculations.

What does a ratio above 10:1 indicate?

The calculator warns that ratios above 10:1 can promote insert concatemers.

mode: checkRatio; vectorSizeBp: 4000; vectorMassNg: 200; insertSizeBp: 750; insertMassNg: 30

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Continue with connected tools and hubs

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. 3:1 ligation setup for a 1 kb insert

2. Check a low-ratio ligation before setup

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