**BioCalculator** is a lightweight, zero-dependency command-line utility engineered in pure Python 3 for biologists, biochemists, and bioinformatics researchers. Designed for cross-platform use on Windows, Linux, and macOS, it delivers essential biological computations through an intuitive, menu-driven interface requiring only the Python standard library. Core capabilities include DNA/RNA/protein sequence analysis (molecular weight, GC content, reverse complement, translation), primer design metrics (melting temperature via nearest-neighbor thermodynamics, annealing temperature estimation), and solution preparation tools (molarity, dilution series, buffer pH via Henderson-Hasselbalch). The application features a built-in periodic table lookup, codon table reference, and unit converters for concentration, mass, and volume. Built with strict input validation, buffer-safe parsing, and modular function architecture, BioCalculator ensures robustness and extensibility without external packages—compiling to a compact, portable script. Its deterministic algorithms (SantaLucia 1998 parameters, Ambiguous IUPAC code support) guarantee reproducible results for academic and laboratory workflows. Ideal for PCR planning, oligo design, enzyme kinetics, or quick molecular weight verification, the tool transforms complex biochemical formalisms into accessible, offline-capable computations. With clear CLI prompts, formatted scientific output, and MIT licensing, BioCalculator empowers users with reliable, keyboard-driven biological utility. Whether calculating primer Tm, preparing serial dilutions, or translating genetic sequences, researchers benefit from instant, distraction-free computational power—making it a versatile companion for bench work, education, or scriptable automation pipelines. 🧬🔬💻

biocalculator

lightweight, zero-dependency command-line

lightweight, zero-dependency command-line