科学工具

化学、生物和实验室计算器。

Free scientific calculators for students, educators, and lab work. Compute molar mass from chemical formulas, convert between grams and moles, balance chemical equations, explore the periodic table, and analyze DNA, genetics, and microscopy data — using standard atomic weights and stoichiometry. Every tool runs in your browser with instant results and no signup.

Popular 科学工具

Molar Mass CalculatorMolar mass calculator free — parse chemical formulas like H2O or Ca(OH)2 and get g/mol with an element breakdown. Browser-based, instant, no signup.
Atomic Mass CalculatorAtomic mass calculator free — IUPAC element lookup or weighted isotope average. Atomic number and u/g/mol. No signup.
Periodic Table ExplorerInteractive periodic table with element details, atomic mass, and electron configuration for all 118 elements.

科学工具

Electron Configuration Generator

Electron configuration generator free — full and noble-gas notation for any element. Aufbau rules + exceptions. No signup.

Used 7 timesUpdated 20 minutes ago

Open Tool

科学工具

Lab Notebook Generator

Generate formatted lab notebook entries from your experiment details. Full entries, procedure logs, or formal experiment reports with objective, materials, procedure, observations, results, and conclusions. Copy and paste into your notebook. Free, browser-based.

Used 4 timesUpdated 2 minutes ago

Open Tool

科学工具

Gear Ratio Calculator

Calculate gear ratio, output RPM, and torque multiplier for spur gear trains. Single-stage, compound 2-stage, RPM solver, and tooth-count finder for target ratios. Enter driver and driven tooth counts — get speed reduction and ideal torque gain. Free, browser-based.

Used 3 timesUpdated 21 minutes ago

Open Tool

科学工具

Codon Finder

Find codons in RNA or DNA — search AUG, stop codons, scan reading frames, and view codon frequencies. Free, instant, browser-based.

Used 2 timesUpdated 19 minutes ago

Open Tool

科学工具

Lab Dilution Calculator

Plan lab dilutions with pipette volumes, 1:N ratio dilutions, and serial dilution schemes. Get C₁V₁=C₂V₂ stock aliquots, sample and diluent volumes, and step-by-step bench procedures in µL, mL, or L. Free, browser-based.

Used 2 timesUpdated 31 minutes ago

Open Tool

科学工具

Mole Calculator

Mole calculator free — convert between grams, moles, and particles using molar mass. Instant chemistry stoichiometry in your browser, no signup.

Used 1 timesUpdated 11 minutes ago

Open Tool

科学工具

Percent Yield Calculator

Percent yield calculator free — find % yield, actual yield, or theoretical yield in grams or moles. Stoichiometry lab prep, no signup.

Used 1 timesUpdated 8 minutes ago

Open Tool

科学工具

Ideal Gas Law Calculator

Ideal gas law calculator free — solve PV=nRT for pressure, volume, moles, or temperature. atm, kPa, L, K, °C. No signup.

Used 1 timesUpdated 33 minutes ago

Open Tool

科学工具

Chemical Name Generator

Convert chemical formulas to names and names to formulas — ionic compounds, acids, hydrates, and common molecules. Free, instant, browser-based.

Used 1 timesUpdated 20 minutes ago

Open Tool

科学工具

DNA Reverse Complement

Get the reverse complement of a DNA or RNA sequence — A↔T/U, G↔C with GC content and FASTA support. Free, instant, browser-based.

Used 1 timesUpdated 35 minutes ago

Open Tool

科学工具

Restriction Enzyme Finder

Find restriction enzyme cut sites in DNA — EcoRI, BamHI, HindIII, and 30+ common enzymes with cut positions. Free, instant, browser-based.

Used 1 timesUpdated 29 minutes ago

Open Tool

科学工具

Genetic Probability Calculator

Calculate offspring genotype and phenotype probabilities from Punnett squares — monohybrid and dihybrid crosses with instant results. Free, browser-based.

Used 1 timesUpdated 22 minutes ago

Open Tool