BenchCalc
Calculators biologists actually use at the bench.
Peptide analysis, primer Tm, solution preparation, and molecular biology tools — in one place.
Peptide Tools
Full Peptide Analysis Tool
Molecular weight, pI, net charge, GRAVY, and mass/mole conversion from amino acid sequence.
Peptide pI Calculator
Isoelectric point from sequence with IPC_peptide pKa set. Charge vs pH curve included.
Peptide Charge Calculator
Net charge at any pH with interactive charge vs pH curve and ionizable group summary.
Amino Acid Properties
Reference table: residue mass, side chain pKa, hydropathy index for all 20 standard amino acids.
Solution Preparation
Dilution Calculator
Hub for simple (C₁V₁ = C₂V₂) and serial dilutions with pipette-friendly output.
Simple Dilution Calculator
Solve for any variable in C₁V₁ = C₂V₂. Get pipetting-ready volumes instantly.
Serial Dilution Calculator
2×/3×/4× fold presets with step-by-step pipetting instructions for plates and tubes.
Molarity Calculator
Calculate mass, volume, or molarity for solution prep. Includes common reagent MW reference.
Concentration Converter
Convert between molarity (M), mg/mL, μg/mL, and % concentrations (w/v, v/v, w/w).
Mixing Calculator
Calculate mixing ratios by weight for buffer preparation and reagent mixing.
Molecular Biology
Primer Tm Calculator
Nearest-neighbor Tm with salt and Mg²⁺ correction. Supports degenerate IUPAC bases and PCR/qPCR annealing guidance.
Tm Calculation Method
SantaLucia 1998 NN parameters, Owczarzy salt/Mg²⁺ correction formulas, and assumptions explained.
Nucleotide MW Calculator
DNA/RNA oligonucleotide MW with ss/ds support, 5' phosphorylation, and mass/mole conversions.
Standard Curve Calculator
Create standard curves with linear or quadratic fitting. Replicate support, outlier exclusion, and copy/share.
BCA Assay Calculator
Pre-loaded BCA protein assay standard series (0–2000 μg/mL) with blank subtraction and dilution factor.
Bradford Assay Calculator
Pre-loaded Bradford protein assay standard series (0–25 μg/mL) with Coomassie dye binding context.
Standard Curve Fitting Method
Linear regression, Beer-Lambert law, R² interpretation, replicate statistics, and BCA/Bradford assay principles.
💡 Why BenchCalc?
Built for the bench. Every calculator is designed for real experimental workflows. No unnecessary features, no complicated interfaces — just the calculations you need.
Instant results. All calculations happen in your browser as you type. No waiting, no "Calculate" buttons to click.
Always free. BenchCalc is and will remain free for researchers. Your data stays in your browser — we don't collect or store anything.