Công cụ khoa học

Máy tính hóa học, sinh học và phòng thí nghiệm.

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.

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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.

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Normality Calculator

Normality calculator free — convert N, molarity, and equivalents per mole. Find normality from mass and volume. Chemistry titration prep in your browser.

Used 7 timesUpdated 27 minutes ago

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Exoplanet Habitability Calculator

Assess exoplanet habitability with habitable zone, equilibrium temperature, and Earth Similarity Index (ESI). Presets for Earth, Proxima b, and Kepler-186f. Free, browser-based.

Used 6 timesUpdated 28 minutes ago

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Cell Division Calculator

Calculate cell count after binary fission — solve for N, N₀, divisions, generation time, or elapsed time with step-by-step growth table. Free, browser-based.

Used 3 timesUpdated 28 minutes ago

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Molecular Formula Calculator

Molecular formula calculator free — find true formula from empirical formula and molar mass, or composition plus experimental M. No signup.

Used 2 timesUpdated 3 minutes ago

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Boyle's Law Calculator

Boyle's law calculator free — solve P1V1=P2V2 for pressure or volume at constant temperature. atm, kPa, L, mL. No signup.

Used 2 timesUpdated 37 minutes ago

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Population Growth Calculator

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.

Used 2 timesUpdated 38 minutes ago

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Phylogenetic Tree Generator

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

Used 2 timesUpdated 3 minutes ago

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Star Distance Calculator

Calculate star distance from parallax or magnitude. Convert between parsecs, light-years, AU, and km. Free, instant, browser-based astronomy tool.

Used 2 timesUpdated 41 minutes ago

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Molar Mass Calculator

Molar 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.

Used 1 timesUpdated 3 minutes ago

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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 4 minutes ago

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Empirical Formula Calculator

Empirical formula calculator free — find simplest formula from mass % or element masses. Mole ratios in your browser, no signup.

Used 1 timesUpdated 2 minutes ago

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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 45 minutes ago

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