All
Chemistry
(28)Reaction Product Predictor
Enter reactant names to look up compounds via PubChem and predict products of common reactions (combustion, acid-base) with a balanced equation.
Open tool →Molar Mass Calculator
Calculate the molar mass of a compound from its chemical formula (e.g. H2O, NaCl).
Open tool →Molarity & Solution Preparation Calculator
Solve for molarity, solute mass, or solution volume from the other two values.
Open tool →Dilution Calculator
Calculate dilution using the C1V1 = C2V2 formula. Solve for any variable.
Open tool →Percent Solution Calculator
Calculate percent concentration (w/w, w/v, v/v) of a solution.
Open tool →Interactive Periodic Table
Browse all 118 elements. Click for atomic weight, electron shells, density, melting & boiling point, and electronegativity. Temperature slider & property heatmap.
Open tool →Unit Converter
Convert between metric units for mass (g, mg, μg, ng), volume (L, mL, μL), and concentration (M, mM, μM, nM).
Open tool →Concentration Converter
Convert between mg/mL and mM (molar concentration) using molar mass.
Open tool →Formula Parser
Parse a chemical formula and view element composition, atom counts, and mass contributions.
Open tool →Chemical Equation Balancer
Balance a chemical equation automatically. Find stoichiometric coefficients (e.g. H2 + O2 -> H2O).
Open tool →pH Calculator
Calculate pH from [H⁺], or from pKa for weak acids and buffers (Henderson-Hasselbalch).
Open tool →Buffer Calculator
Design a buffer solution using the Henderson-Hasselbalch equation. Compute the [A⁻]/[HA] ratio, concentrations, moles, and masses.
Open tool →Centrifuge RPM ↔ RCF Converter
Convert between centrifuge RPM and relative centrifugal force (RCF, × g) using the rotor radius.
Open tool →Serial Dilution Calculator
Calculate concentration at each step of a serial dilution. Supports dilution factor and step count, with optional per-step volume.
Open tool →Stoichiometry Calculator
Calculate reactant and product moles and masses from a balanced chemical equation — enter coefficients and formulas, then specify one known mass.
Open tool →Empirical Formula Calculator
Determine the empirical formula of a compound from elemental mass percentages. Converts each element to moles and simplifies to the smallest whole-number ratio.
Open tool →Molecular Formula Calculator
Determine the molecular formula from an empirical formula and molar mass. Calculates the integer multiplier and the full molecular formula.
Open tool →Density Calculator
Calculate density (ρ = m/V), mass, or volume from the other two values. Supports any combination of known and unknown variables.
Open tool →Solubility Converter
Convert solubility units between g/L, mg/mL, mol/L, ppm and more, with mass-to-molar conversion by molecular weight.
Open tool →pKa / Henderson-Hasselbalch
Solve the Henderson-Hasselbalch equation for pH, pKa or the conjugate base/acid ratio.
Open tool →Titration Curve Calculator
Simulate strong- and weak-acid titrations with a strong base — plot the pH curve and find the equivalence point.
Open tool →SMILES to Molecular Weight
Enter a SMILES string to get the molecular formula and molar mass, with implicit hydrogen handling.
Open tool →Crystal Density Calculator
Compute theoretical density from unit cell parameters, formula weight and Z.
Open tool →Solid-State Synthesis Calculator
Convert a target product mass into precursor weighing amounts by molar ratio.
Open tool →Bragg's Law Calculator
Convert between d-spacing and 2-theta, or index peaks of a cubic unit cell.
Open tool →TGA Mass-Loss Calculator
Turn thermogravimetric steps into per-step mass loss and final residue.
Open tool →Particle Size Distribution
Compute D10, D50, D90, mean and span from a particle size distribution.
Open tool →Battery Electrode Coating Calculator
Relate areal capacity, loading, coating thickness and N/P ratio for battery electrodes.
Open tool →Biology
(48)DNA Reverse Complement
Compute the reverse complement of a DNA sequence (A↔T, C↔G) instantly.
Open tool →GC Content Calculator
Calculate the GC content percentage and base composition of a DNA sequence.
Open tool →DNA Base Counter
Count the occurrence of each nucleotide (A, T, C, G) in a DNA sequence.
Open tool →DNA Sequence Cleaner
Clean a DNA sequence by removing whitespace, numbers, and non-standard characters.
Open tool →DNA to RNA Transcription
Transcribe a DNA sequence into RNA by replacing thymine with uracil (T→U).
Open tool →ORF Finder
Find open reading frames (ORFs) in a DNA sequence across all 6 reading frames, from start (ATG) to stop codon.
Open tool →Agarose Gel Calculator
Recommend agarose gel percentage by DNA size and calculate agarose powder and buffer volumes for gel preparation.
Open tool →GC Content Distribution
Plot GC percentage along a DNA sequence with a sliding window to spot GC-rich and AT-rich regions.
Open tool →Local Alignment + Dot Plot
Compare two DNA sequences with a dot plot and Smith-Waterman local alignment, showing score and identity.
Open tool →DNA Translation Tool
Translate a DNA sequence into a protein using the standard genetic code, with all 6 reading frames and stop codon detection.
Open tool →Protein Molecular Weight Calculator
Calculate the molecular weight of a protein from its amino acid sequence (1-letter or 3-letter codes).
Open tool →Codon Table
Browse the standard genetic code table — all 64 DNA and RNA codons mapped to amino acids, with 1-letter and 3-letter codes.
Open tool →Protein pI Calculator
Calculate the isoelectric point (pI) of a protein from its amino acid sequence, with net charge at pH 7 and charged residue counts.
Open tool →Amino Acid Composition
Analyze the amino acid composition of a protein — count, percentage, and mass contribution of each residue.
Open tool →Protein Domains & Motifs
Predict transmembrane helices, hydropathy, signal peptides, coiled-coils and common motifs from an amino acid sequence.
Open tool →Enzyme Kinetics
Fit Michaelis-Menten kinetics with a Lineweaver-Burk plot — estimate Vmax and Km from substrate-rate data.
Open tool →Protein Structure Analyzer
Analyze a PDB, mmCIF or FASTA file: chains, sequences, secondary structure, molecular weight, pI and a hydrophobicity profile.
Open tool →Cell Culture Calculator
Cell counting (hemocytometer), seeding volume, split ratio, and viability — common cell culture calculations.
Open tool →Cell Seeding Calculator
Calculate cell seeding density by culture vessel area — compute total cells, stock volume, and diluent volume for any plate or flask.
Open tool →Cell Doubling Time Calculator
Work out doubling time, number of doublings and specific growth rate from two cell counts, then project cell numbers over 24 to 120 hours.
Open tool →Cell Culture Media Recipe Calculator
Calculate how much FBS and how much of each supplement to add to a final medium volume, and how much basal medium is left over.
Open tool →CFU & Plating Efficiency Calculator
Calculate CFU/mL and plating efficiency from colony counts, and back-solve how many cells to seed for a target colony number.
Open tool →Plasmid Designer
Upload a GenBank/FASTA plasmid, draw a circular map, annotate restriction sites, and export PNG/SVG.
Open tool →Gibson Assembly Calculator
Check homology arms and assemble multiple DNA fragments into one sequence.
Open tool →Golden Gate Assembly Tool
Check 4 nt overhang compatibility and assemble Type IIs parts in one pot.
Open tool →In-Fusion Cloning Calculator
Design 15 bp homology arms and assemble fragments by homologous recombination.
Open tool →Gateway Cloning Calculator
Locate attB sites on vector and insert and generate the expression clone.
Open tool →SLiCE Cloning Calculator
Plan Seamless Ligation Cloning Extract reactions with 25 bp homology arms.
Open tool →TA & TOPO Cloning Calculator
Simulate TA and TOPO cloning of a PCR product into a linear vector.
Open tool →Site-Directed Mutagenesis Tool
Design primers for point mutations, insertions and deletions in one step.
Open tool →In-Silico PCR Tool
Predict every amplicon a primer pair can produce on your template.
Open tool →Overlap Extension PCR Tool
Fuse two fragments by SOE PCR and check the overlap before you order primers.
Open tool →Restriction Analysis
Find restriction sites in a sequence and simulate single or double digests with fragment sizes.
Open tool →Restriction Enzyme Database
Search restriction enzymes by recognition site, overhang, buffer, methylation sensitivity and supplier.
Open tool →CRISPR gRNA Design
Find SpCas9 target sites with PAM, GC content and an on-target quality score.
Open tool →Codon Optimization
Reverse-translate a protein into DNA using host codon usage, or optimize an existing CDS.
Open tool →Synonymous Mutation Design
Add or remove restriction sites without changing the encoded protein sequence.
Open tool →Chromatogram Viewer (.ab1)
Open Sanger .ab1 trace files in your browser and read called bases with quality values.
Open tool →Primer Design Tool
Design PCR primer pairs from a template and a target region, with Tm, GC content and product size for each pair.
Open tool →Primer Tm Calculator
Calculate primer melting temperature (Tm) using the Wallace rule and salt-adjusted formula, with GC content and length.
Open tool →Primer Checker
Check a primer for hairpins and dimers, and scan a template for off-target binding sites with mismatch tolerance.
Open tool →Oligo Calculator
Calculate oligo molecular weight, GC content and extinction coefficient, plus the water volume that gives a 100 µM stock.
Open tool →PCR Calculator
PCR helper calculator — estimate annealing temperature, extension time, product mass, and amplification fold from cycle count.
Open tool →Dose-Response Curve Fit (IC50)
Fit a 4-parameter logistic curve to dose-response data and solve IC50 or EC50.
Open tool →qPCR Standard Curve Calculator
Fit a qPCR standard curve from your Cq values and read off amplification efficiency, slope, R² and ΔCq — then back-calculate an unknown sample's template quantity.
Open tool →DNA Copy Number Calculator
Convert DNA mass to molecule copy number (and back) from template length, with a quick-reference table for amplicons, plasmids, E. coli and human genome templates.
Open tool →Protein Assay Calculator (BCA/Bradford)
Build a BCA or Bradford standard curve, interpolate sample absorbance to protein concentration, and correct for the dilution factor.
Open tool →Enzyme Activity Unit Converter
Convert between U, mU, nkat, µkat and katal, or compute activity from an absorbance rate using extinction coefficient, path length and protein concentration.
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