Free chi-square calculator — run goodness of fit tests and tests of independence with full (O−E)²/E working tables, p-values, critical values, and Cramér’s V effect size. Supports contingency tables up to 6×6
Free Hardy-Weinberg calculator. Solve p, q, p², 2pq, q² from any known value — recessive phenotype frequency, allele frequency, or observed counts — with complete step-by-step working. Includes genotype frequency calculator, allele frequency calculator, and phenotype frequency calculator
Free Punnett square calculator and generator. Create 2×2 monohybrid, 4×4 dihybrid, 8×8 trihybrid, and 16×16 quadhybrid crosses instantly. Includes ABO blood type, X-linked, and special cross modes with step-by-step results
Free DNA molecular weight calculator compute MW from sequence or length, convert between ng/µL, nM, and pmol, calculate DNA concentration and purity from A260/A280 spectrophotometer readings. Supports dsDNA, ssDNA, and RNA
Free reverse complement calculator for DNA and RNA sequences. Find the complement, reverse, and reverse complement instantly. Supports IUPAC ambiguity codes, FASTA input, GC content, palindrome detection, and DNA-to-mRNA transcription
Predict your puppy’s adult weight and size category based on breed, current weight, and age