科學工具

Calculate radioactive decay with half-life — remaining amount, elapsed time, or half-life from N = N₀(½)^(t/t½). Free, instant, browser-based.

Convert DNA to RNA — replace T with U on the coding strand, or transcribe from the template strand. FASTA support. Free, instant, browser-based.

Translate RNA to protein with the standard genetic code — reading frames, AUG start, stop codons, and codon table. Free, instant, browser-based.

Calculate GC content and base composition for DNA or RNA — percentages, counts, AT/GC ratio, and FASTA support. Free, instant, browser-based.

Calculate DNA primer melting temperature (Tm) — Wallace rule, salt-adjusted, and long-oligo formulas with adjustable Na⁺. Free, instant, browser-based.

Calculate protein molecular weight from amino acid sequence — average mass in Da and kDa with composition breakdown. Free, instant, browser-based.

Calculate population growth with exponential and logistic models — solve for N, growth rate r, time, or N₀ with projections and doubling time. Free, browser-based.

Predict child blood types from parent ABO and Rh types — Punnett squares, probabilities, and combined outcomes like A+ or O−. Free, instant, browser-based.

Build phylogenetic trees from distance matrices, aligned DNA sequences (UPGMA), or Newick strings — SVG diagram, ASCII tree, and export. Free, browser-based.

Simulate DNA/RNA mutations — substitutions, insertions, deletions, and seeded random SNPs with highlighted output and mutation log. Free, browser-based.

Calculate microscope total magnification, field of view from FN, and actual specimen size from image measurements — eyepiece × objective. Free, browser-based.

Find your weight on Mercury, Venus, Mars, Jupiter, the Moon, and other worlds. Enter Earth weight in kg or lb and compare surface gravity instantly. Free, browser-based.