Lab ToolsBuilt-in & ExternalPractical for Biologists

Tools

Scientific calculators for molecular biology and lab work

Practical molecular biology calculators and research utilities for everyday lab work.

Notebook Workspace

A quiet local workspace for writing notes, drafting ideas, and keeping small research tasks in order.

Opens in a new tabNotebook

Notebook

Open a minimal academic workspace for longer notes, article drafts, lab reminders, and local task planning.

WritingQuick NotesTasksDraftsLocal Save

Writing

Large document area for longer notes

Tasks

Simple local task maker

Use it for private notes and small academic tasks.Open Notebook ->

Lab calculators by category

Browse active calculators and planned fallback tools by scientific workflow. Only real tools open; planned tools are marked clearly.

Protein science

Protein & Enzyme Tools

Calculators for protein concentration, enzyme activity, and biochemical assay planning.

A280 Protein Concentration Calculator

Calculate protein concentration from A280 absorbance using extinction coefficient and path length.

A280protein concentrationabsorbanceextinction coefficientBeer-LambertNanodropprotein quantification
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Protein Concentration Unit Converter

Convert protein concentration between µM, mg/mL, and µg/mL using molecular weight in kDa.

µM to mg/mLmg/mL to µMµg/mL to µMprotein concentrationmolecular weightkDa
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Specific Activity Calculator

Calculate enzyme specific activity as activity normalized to protein amount.

specific activityenzyme unitsU/mgprotein assay
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Enzyme Activity Calculator

Calculate total enzyme activity and activity concentration from product formed over time.

enzyme activityU/mLproduct formedreaction time
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Protein Dilution Calculator

Calculate stock protein and buffer volumes for preparing a target protein concentration.

protein dilutionstock proteinworking concentrationbuffer
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Molecular Weight / kDa Calculator

Convert molecular weight between Da, kDa, and g/mol for protein calculations.

molecular weightkDaDag/molprotein
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Nucleic acids

DNA / RNA Quantification

Nanodrop-style calculators for nucleic acid concentration, purity ratios, and absorbance-based estimates.

DNA A260 Concentration Calculator

Calculate dsDNA or ssDNA concentration from A260 absorbance and dilution factor.

DNA A260NanodropdsDNAssDNA
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RNA A260 Concentration Calculator

Calculate RNA concentration from A260 absorbance and dilution factor.

RNA A260NanodropRNAng/µL
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A260/A280 Purity Calculator

Calculate A260/A280 ratio and interpret nucleic acid purity cautiously.

A260/A280purityDNA/RNA
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A260/A230 Purity Calculator

Calculate A260/A230 ratio and screen for possible extraction contaminants.

A260/A230puritycontaminants
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Absorbance to Moles Calculator

Estimate concentration and molecule amount from absorbance, coefficient, path length, and volume.

absorbancemolesnmolpmol
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Amplification

PCR & Primer Tools

Quick utilities for primer properties, PCR setup, qPCR calculations, and amplification efficiency.

Primer Tm Calculator

Calculate primer melting temperature, base counts, GC%, and sequence length.

primer TmWallace rulePCRGC%
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Primer GC% Calculator

Calculate primer GC percentage, base counts, and sequence length.

primer GC%GC contentPCRbase counts
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PCR Reaction Setup Calculator

Calculate per-reaction and master mix volumes for PCR setup.

PCR setupmaster mixreaction volumewater volume
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PCR Efficiency Calculator

Calculate PCR or qPCR efficiency from a standard curve slope.

PCR efficiencyqPCRstandard curveslope
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qPCR Dilution / Standard Curve Tool

Generate qPCR standard curve concentrations and dilution steps.

qPCRstandard curveserial dilutionreplicates
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Molecular cloning

Cloning & Transformation

Planning tools for ligation, restriction digestion, plasmid work, and transformation calculations.

Ligation Calculator

Calculate insert DNA amount for a desired insert:vector molar ratio.

ligationinsert:vectorcloningng DNA
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Insert:Vector Ratio Calculator

Calculate the insert:vector molar ratio from DNA lengths and amounts.

insert:vectormolar ratioligationcloning
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Restriction Digest Setup Calculator

Calculate DNA, buffer, enzyme, and water volumes for a restriction digest.

restriction digestenzymeDNA volumewater volume
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Transformation Efficiency Calculator

Calculate bacterial transformation efficiency as CFU per microgram DNA.

transformationCFU/µgcompetent cellsplasmid
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Plasmid DNA Amount Calculator

Estimate plasmid pmol, fmol, and molecule count from plasmid size and DNA mass.

plasmidDNA masspmolmolecules
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Research workflow

Writing, Protocol & Timing Utilities

Small browser-based helpers for protocol writing, timing, and everyday research organization.

Stopwatch

Simple elapsed-time tracking in the browser

00:00

Timers

Add as many countdown timers as you need

Timer 1

Paused

05:00

Bench preparation

Lab Preparation & Dilution

Everyday calculators for dilutions, buffers, gels, stocks, and media preparation.

C1V1 = C2V2 Dilution Calculator

Calculate stock volume and diluent volume for a simple dilution.

C1V1C2V2dilutionstock solution
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Serial Dilution Calculator

Generate a serial dilution table with transfer volume, diluent volume, and concentration at each step.

serial dilutiondilution seriestransfer volumestandard curve
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Agarose Gel Calculator

Calculate agarose mass and buffer volume for preparing agarose gels.

agarose gelgel percentageelectrophoresisbuffer
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Buffer Preparation Calculator

Calculate mass needed to prepare a generic buffer or reagent solution.

buffermolaritymolecular weightmass
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Stock Solution Calculator

Calculate mass needed to prepare a stock solution from molarity, molecular weight, and volume.

stock solutionmolaritymolecular weightmass
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Media Preparation Calculator

Calculate media powder mass and water volume for common or custom g/L media recipes.

mediaLB brothLB agarg/L
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Molarity Calculator

Calculate reagent mass required from molecular weight, desired molarity, and final volume.

molaritymassmolecular weightsolution
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Mass ↔ Moles Calculator

Convert between mass and moles using molecular weight.

massmolesmolecular weightgrams
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Percent Solution Calculator

Calculate solute mass or liquid volume for percent w/v or v/v solutions.

percent solutionw/vv/vsolution prep
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Unit Converter

Convert common mass, volume, and temperature units used in lab workflows.

unit convertermassvolumetemperature
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Easy-to-Copy Symbols for Biology and Chemistry

Click any symbol to copy it instantly.

Greek Letters

Math & Logic

Arrows & Reactions

Special Scientific Symbols

Important Online Tools for Biologists

Hover for a quick description, or click to open the resource.

NCBI BLAST

Sequence Search

Sequence similarity search for DNA or protein sequences.

Open tool ↗

ExPASy ProtParam

Protein Analysis

Protein molecular weight, pI, instability index, and more.

Open tool ↗

ExPASy Translate

Translation

Translate DNA or RNA sequence into protein sequence.

Open tool ↗

ExPASy Compute pI/Mw

Protein Properties

Calculate theoretical pI and molecular weight.

Open tool ↗

NEB Tm Calculator

PCR Design

Estimate PCR primer annealing temperature.

Open tool ↗

Primer-BLAST

Primer Design

Design primers and check specificity.

Open tool ↗

IgBLAST

Immunology

Analyze immunoglobulin and T-cell receptor sequences.

Open tool ↗

SnapGene Viewer

Sequence Viewer

View plasmids and annotated sequence files.

Open tool ↗