Chemistry Tools

Science Calculators

Use educational science calculators that keep formulas, units, and assumptions visible. This cluster now covers chemistry, physics, and lab measurement checks for classroom problem solving, not medical decisions or laboratory safety procedures.

Open molar mass Lab calculators

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Molar Mass Calculator

Calculate molar mass from a chemical formula with element counts, atomic weights, and percent-by-mass rows.

Dilution Calculator

Calculate stock volume, solvent volume, dilution factor, and final moles from $M_1V_1=M_2V_2$ .

pH Calculator

Convert pH, pOH, hydrogen ion concentration, and hydroxide ion concentration with classroom chemistry formulas.

Chemistry Calculators

Science tools available now

Chemistry

Molar Mass Calculator

Calculate molar mass from a chemical formula with element counts, atomic weights, and percent-by-mass rows.

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Chemistry

Dilution Calculator

Calculate stock volume, solvent volume, dilution factor, and final moles from $M_1V_1=M_2V_2$ .

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Chemistry

pH Calculator

Convert pH, pOH, hydrogen ion concentration, and hydroxide ion concentration with classroom chemistry formulas.

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Physics Calculators

Electricity and motion calculators added for physics work

Physics Calculators

Use the physics hub for Ohm's law, electrical power, kinetic energy, velocity, and acceleration calculations. Each tool keeps SI units, formula substitutions, and conversion rows visible so homework checks and worksheet answers can be audited.

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Ohm's Law Calculator

Calculate voltage, current, resistance, and power with ampere, milliampere, ohm, kilohm, volt, and watt conversions.

Electrical Power Calculator

Calculate watts, kilowatts, joules, kWh, and equivalent resistance from voltage, current, and run time.

Kinetic Energy Calculator

Calculate kinetic energy, momentum, and energy conversions from mass and speed inputs.

Velocity and Acceleration Calculator

Calculate final velocity, displacement, acceleration, average velocity, and motion unit conversions.

Lab Measurements

Significant figures, percent error, and density checks

Lab and Measurement Calculators

Use the lab hub for measurement-reporting tasks that often sit beside a lab report table: significant figure counting, rounded values, percent error, density, and unit comparison rows. The pages cite measurement and SI references so students can audit how values were interpreted.

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Significant Figures Calculator

Count significant figures, decimal places, rounded values, scientific notation, and ambiguous trailing-zero cases.

Percent Error Calculator

Calculate signed error, absolute error, relative error, and percent error from measured and accepted values.

Density Calculator

Calculate density from mass and volume with $\frac{\mathrm{kg}}{\mathrm{m}^3}$ , $\frac{\mathrm{g}}{\mathrm{cm}^3}$ , g/mL, kg/L, $\frac{\mathrm{lb}}{\mathrm{ft}^3}$ , and lb/gal outputs.

What Can You Check?

Chemistry formulas with units and assumptions attached

Molar mass and composition

Parse common formulas, sum atomic-weight contributions, and compare percent-by-mass rows.

Concentration and dilution

Use $M_1V_1=M_2V_2$ with molar, millimolar, micromolar, liter, milliliter, and microliter units.

Measurement quality checks

Round measured values, report percent error, and compare density outputs across common lab units.

Formula Map

Core relationships in the science calculator cluster

Topic	Formula	Use
Molar mass	$M=\sum_i n_i A_i$	Convert a written formula into grams per mole and percent composition.
Dilution	$M_1V_1=M_2V_2$	Calculate stock volume when concentration is lowered by solvent.
pH	$\mathrm{pH}=-\log_{10}[\mathrm{H}^{+}];\quad\mathrm{pH}+\mathrm{pOH}=14\text{ at }25^\circ\mathrm{C}$	Connect concentration values with logarithmic pH and pOH checks.
Percent error	$E_{\%}=\frac{\|x_{\mathrm{measured}}-x_{\mathrm{accepted}}\|}{\|x_{\mathrm{accepted}}\|}\times100$	Compare an experimental measurement against a reference or accepted value.
Density	$\rho=\frac{m}{V}$	Convert mass and volume into density units for lab report calculations.

Concentration Guide

Read the chemistry basics behind the tools

Chemistry Concentration Basics

Review molarity, dilution variables, pH relationships, concentration unit shifts, and source notes before using the calculators for classroom chemistry problems.

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References

External chemistry references used for checks

BIPM mole definition NIST atomic weights LibreTexts dilution equation IUPAC pH definition

Scope Note

Educational chemistry, not operational lab advice

Toolarithm's science calculators are built for transparent formula practice. The first science release focuses on chemistry relationships that students often need to check: molar mass, simple dilution, and pH. The tools show units, assumptions, formula variables, and source links so a result can be audited instead of copied blindly.

These pages do not replace laboratory protocols, safety review, calibrated instruments, material safety documents, medical guidance, or regulatory standards. They are intended for classroom examples, study notes, and formula understanding.