Are significant figures handled correctly?

Results respect the precision of your inputs and let you choose how many decimals or significant figures to display.

Can students use these in exams?

Check your institution's rules. The tools are built for study, homework and lab work rather than as approved exam devices.

Which unit system is used?

SI units throughout, with conversions available through the OneCalcApp unit converters when another system is required.

Is a graphing mode planned?

Yes — plotting for functions and datasets is on the roadmap and will appear in the Recently added list when released.

OneCalcApp Platform

Scientific Calculators

A full scientific calculator plus physics, chemistry, mathematics and statistics tools with formulas, units and worked steps for students and researchers.

Flagship instrument

The OneCalcApp Scientific Calculator

Trigonometry, logarithms, powers, roots, memory, fractions, matrices, vectors and complex numbers — with calculation history, keyboard control and instant results.

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Physics

Motion, energy and waves with SI units and full working.

Kinetic Energy Calculator

Energy of a moving body from its mass and speed.

Projectile Motion Calculator

Range, maximum height and flight time from launch speed and angle.

Wavelength & Frequency Calculator

Convert between wavelength, frequency and photon energy.

Density Calculator

Density, mass or volume of any material in SI units.

Chemistry

Concentration, dilution, acidity and gas behaviour.

Molarity Calculator

Solution concentration from solute mass, molar mass and volume.

Dilution Ratio Calculator

Mix any dilution ratio from 1:10 to 1:1000 — get concentrate and water amounts in oz per gallon, ml per litre, plus a printable ratio chart.

pH Calculator

Convert between hydrogen ion concentration, pH and pOH.

Ideal Gas Law Calculator

Solve PV = nRT for pressure with known moles, volume and temperature.

Mathematics & Statistics

Algebra and data analysis with step-by-step substitution.

Quadratic Equation Solver

Roots, discriminant and vertex of ax² + bx + c = 0.

Standard Deviation Calculator

Mean, median, variance and standard deviation for any data set.

Z-Score Calculator

How many standard deviations a value sits from the mean.

Electricity

Everyday circuit maths for students and technicians.

Ohm's Law Calculator

Find voltage, current, resistance or power from any two known values.

About the science suite

From a trigonometric expression to a molarity or a standard deviation, the OneCalcApp science suite shows the equation, the substitution and the result with correct significant figures and SI units.

Each tool is designed for classroom and lab use: fast on mobile, readable in dark mode and printable when you need the working on paper.

Frequently asked questions

Yes. Each result comes with the formula used, the substituted values and the final answer in the correct units.