Biochemistry
Peptide charge & pI calculator
Net charge at any pH, the isoelectric point, a titration curve, and the full Henderson-Hasselbalch breakdown for every ionizable group.
"how to calculate the pI of a peptide" →Enzyme kinetics simulator
Michaelis-Menten and Lineweaver-Burk plots, live, with competitive / noncompetitive / uncompetitive inhibition and the worked Km and Vmax.
"competitive vs noncompetitive inhibition" →Michaelis-Menten fitter
Paste your enzyme-lab data and instantly get Km, Vmax, and R² with a curve fitted through your points — the regression done for you.
"find Km and Vmax from data" →Amino acid titration curve
Pick an amino acid and see its full titration curve with every buffering region and the pI marked, and worked.
"amino acid titration curve" →Amino acid quiz
Drill all 20 amino acids — one-letter codes, three-letter codes, and class — with instant scoring and a reference table.
"amino acid quiz" →Molecular biology
DNA → protein translation
Transcribe and translate any DNA sequence step by step — mRNA, codons, and protein with start/stop highlighted, plus the full codon table.
"translate DNA to protein" →DNA melting temp & GC
Paste a primer — get its Tm, GC content, base composition, and reverse complement instantly, with the formula shown.
"primer melting temperature" →Glycolysis pathway explorer
Step through all 10 reactions with a live ATP/NADH tally, every enzyme named, and the three regulated steps highlighted.
"glycolysis steps and net ATP" →Genetics
Punnett square solver
Type two genotypes and get the full square plus genotype and phenotype ratios — monohybrid and dihybrid.
"dihybrid cross calculator" →Hardy-Weinberg calculator
Allele and genotype frequencies from p or from counts, plus a chi-square equilibrium test — fully worked.
"hardy weinberg calculator" →Chemistry
pH calculator
pH, pOH, [H⁺], and [OH⁻] for strong and weak acids and bases — solved exactly, with every step shown.
"pH of a weak acid" →Buffer calculator
Exact acid and conjugate-base amounts to hit any target pH, with the full worked math and a buffering-range check.
"how to make a buffer at a given pH" →Gibbs free energy
Is the reaction spontaneous? Compute ΔG from ΔH/ΔS/T or from ΔG°′ and Q, with the crossover temperature.
"is the reaction spontaneous" →Nernst equation
Cell potential from E°, n, and Q at any temperature, with both the RT/nF and 0.0592/n forms shown.
"nernst equation calculator" →Beer-Lambert calculator
Absorbance ↔ concentration with A = εbc, plus an absorbance/%transmittance converter, fully worked.
"absorbance to concentration" →Ideal gas law (PV = nRT)
Solve for pressure, volume, moles, or temperature with the right gas constant and every step shown.
"ideal gas law calculator" →Solutions & lab prep
Molar mass & molarity
Type any chemical formula for its molar mass, then get the exact grams to weigh for your target concentration and volume.
"how many grams for a solution" →Dilution calculator (C₁V₁ = C₂V₂)
Solve for any variable and see exactly how much stock and solvent to mix — with every step shown.
"dilution calculator" →Serial dilution calculator
The concentration at every step of your series, plus exactly how much sample and diluent to add per tube.
"serial dilution calculator" →Why these are different
A calculator gives you a number. A cheat sheet gives you facts to memorize. Neither teaches you the method — which is what you actually need when there's no calculator on the exam. Every tool here shows the work as you change the inputs, so the reasoning sticks. Free, fast, mobile-friendly, and shareable — built for biochem and the MCAT.