Are Calquto's science calculators free to use?

Yes. All 100+ calculators in the Science suite are free, run entirely in your browser, and don't require sign-up. Nothing you enter is stored or sent anywhere.

Do the calculators show step-by-step working, not just the answer?

Yes. Every calculator shows the full worked solution alongside the final answer — useful for checking homework or understanding the method, not just getting a number.

What areas of science does this suite cover?

Physics (mechanics, energy & waves, electricity & modern physics), chemistry, biology, astronomy, and earth & environmental science — 100+ calculators across 7 categories.

Science Calculators: Ohm’s Law, pH, Ideal Gas Law, Molarity, Speed/Distance/Time & 100+ More

Full Directory: All 102 Science Calculators

Every calculator below opens instantly in the suite above with full step-by-step working. Browse by category or use the search box to jump straight to one.

Physics — Mechanics (16)

Speed, Distance & Time Calculator — Solves for whichever of speed, distance, or time is missing.
Acceleration Calculator — Acceleration from change in velocity over time.
Newton\u2019s Second Law Calculator (F=ma) — Force, mass, or acceleration from Newton\u2019s second law.
Momentum Calculator — Linear momentum from mass and velocity.
Impulse Calculator — Impulse from force applied over a time interval (equal to change in momentum).
Kinetic Energy Calculator — Kinetic energy of a moving object from mass and velocity.
Gravitational Potential Energy Calculator — Potential energy of a mass at a height above the ground.
Work Done Calculator — Work done by a force acting over a distance, accounting for the angle between them.
Power Calculator — Mechanical power from work done over time.
Projectile Motion Calculator — Range, max height, and flight time of a projectile launched at an angle.
Free Fall Calculator — Fall time, final velocity, and distance fallen under gravity.
Friction Force Calculator — Force of friction from the normal force and coefficient of friction.
Centripetal Force Calculator — Centripetal force and acceleration for an object moving in a circle.
Torque Calculator — Rotational force (torque) from applied force, lever arm length, and angle.
Spring Force Calculator (Hooke\u2019s Law) — Restoring force of a spring from its stiffness and displacement.
Terminal Velocity Calculator — Maximum falling speed of an object once drag force balances gravity.

Physics — Energy & Waves (10)

Pressure Calculator — Pressure from force applied over an area.
Density Calculator — Density of a material from its mass and volume.
Buoyancy Force Calculator (Archimedes\u2019 Principle) — Upward buoyant force on an object submerged in a fluid.
Wave Speed Calculator — Speed of a wave from its frequency and wavelength (v = fλ).
Doppler Effect Calculator — Observed frequency shift when a sound source moves relative to an observer.
Snell\u2019s Law (Refraction) Calculator — Angle of refraction when light passes between two media.
Thin Lens Equation Calculator — Image distance and magnification from object distance and focal length.
Mirror Equation Calculator — Image distance and magnification for a spherical mirror.
Heat Energy Calculator (Q=mcΔT) — Heat energy needed to change a substance\u2019s temperature.
Thermal (Linear) Expansion Calculator — Change in length of a material due to a temperature change.

Physics — Electricity & Modern Physics (10)

Ohm\u2019s Law Calculator — Voltage, current, or resistance from Ohm\u2019s Law (V=IR).
Electrical Power Calculator — Electrical power from voltage and current (P=VI).
Resistors in Series & Parallel Calculator — Total resistance of up to three resistors, in series or parallel.
Capacitor Charge & Energy Calculator — Charge stored and energy stored in a capacitor.
Coulomb\u2019s Law Calculator — Electrostatic force between two point charges.
Newton\u2019s Law of Gravitation Calculator — Gravitational force between two masses.
Escape Velocity Calculator — Minimum speed to escape a planet\u2019s gravity without further propulsion.
Radioactive Half-Life Calculator — Remaining quantity of a radioactive substance after a given time.
Time Dilation Calculator (Special Relativity) — How much time slows down for an object moving at a significant fraction of light speed.
Photon Energy Calculator — Energy of a single photon from its frequency or wavelength (E = hf).

Chemistry (21)

Molar Mass Calculator — Molar mass of a simple compound from its atomic composition.
Moles ↔ Mass Converter — Convert between grams and moles using molar mass.
Molarity Calculator — Molar concentration of a solution from moles of solute and volume.
Dilution Calculator (M₁V₁=M₂V₂) — Finds the missing value when diluting a stock solution.
pH Calculator — pH from hydrogen ion concentration, or concentration from pH.
Ideal Gas Law Calculator (PV=nRT) — Solves for pressure, volume, moles, or temperature of an ideal gas.
Percent Composition Calculator — Percentage by mass of a component within a total mixture or compound.
Boyle\u2019s Law Calculator (P₁V₁=P₂V₂) — Finds the missing pressure or volume at constant temperature.
Charles\u2019s Law Calculator (V₁/T₁=V₂/T₂) — Finds the missing volume or temperature at constant pressure.
Combined Gas Law Calculator — Finds the final pressure, volume, or temperature when all three change.
Moles ↔ Particles Converter (Avogadro\u2019s Number) — Convert between moles and number of particles (atoms, molecules, ions).
Stoichiometry Mole Ratio Calculator — Moles of product from moles of reactant, using a balanced equation\u2019s mole ratio.
Parts Per Million (ppm) Calculator — Converts between ppm and percent concentration, or finds ppm from mass ratio.
Specific Heat Calculator — Finds specific heat capacity from heat energy, mass, and temperature change.
Percent Yield Calculator — Percent yield of a chemical reaction from actual and theoretical yields.
Freezing Point Depression Calculator — How much a solvent\u2019s freezing point drops when a solute is dissolved.
Boiling Point Elevation Calculator — How much a solvent\u2019s boiling point rises when a solute is dissolved.
Atomic Structure Calculator — Number of protons, neutrons, and electrons in a neutral atom or ion.
Buffer pH Calculator (Henderson\u2013Hasselbalch) — pH of a buffer solution from the pKa and the concentration ratio of base to acid.
Gas Density Calculator — Density of an ideal gas from its molar mass, pressure, and temperature.
Empirical Formula Calculator (Two Elements) — Finds the simplest whole-number ratio formula from percent composition of two elements.

Biology (16)

Exponential Population Growth Calculator — Projects population size using continuous exponential growth.
Logistic Population Growth Calculator — Projects population size accounting for a carrying capacity limit.
Hardy\u2013Weinberg Equilibrium Calculator — Genotype frequencies in a population from an allele frequency.
DNA GC Content Calculator — Percentage of guanine and cytosine bases in a DNA sequence.
DNA Complement & Reverse Complement Finder — Finds the complementary and reverse-complementary DNA strand.
Codon to Amino Acid Translator — Translates an RNA codon into its corresponding amino acid.
Michaelis\u2013Menten Enzyme Kinetics Calculator — Reaction velocity from substrate concentration using the Michaelis-Menten equation.
Body Surface Area Calculator (Mosteller Formula) — Estimates a person\u2019s body surface area from height and weight.
Blood Alcohol Content Estimator (Widmark Formula) — Estimates BAC from drinks consumed, body weight, sex, and time elapsed.
Bacterial Growth & Generation Time Calculator — Number of bacteria after a period of exponential doubling.
PCR Amplification Calculator — Number of DNA copies produced after a given number of PCR cycles.
Osmolarity Calculator — Osmolarity of a solution from the molar concentration and number of dissociated particles.
Shannon Diversity Index Calculator — Measures species diversity in an ecological community from species counts.
Radiocarbon (Carbon-14) Dating Calculator — Estimates the age of an organic sample from its remaining Carbon-14 percentage.
Respiratory Quotient Calculator — Ratio of CO₂ produced to O₂ consumed during metabolism, indicating fuel source.
Monohybrid Cross Probability Calculator — Predicted genotype and phenotype ratios from a monohybrid genetic cross.

Astronomy (13)

Orbital Period Calculator (Kepler\u2019s Third Law) — Orbital period of a planet or satellite from its orbital radius and central mass.
Orbital Velocity Calculator — Speed needed to maintain a circular orbit at a given altitude.
Light-Year Distance Converter — Convert between light-years, astronomical units, parsecs, and kilometers.
Redshift Velocity Calculator — Recession velocity of a distant object from its observed redshift.
Apparent vs Absolute Magnitude Calculator — Converts between a star\u2019s apparent brightness and its true (absolute) brightness.
Schwarzschild Radius Calculator — The event horizon radius of a black hole from its mass.
Planetary Surface Gravity Calculator — Surface gravity of a planet from its mass and radius.
Astronomical Unit Converter — Convert distances between AU, kilometers, and miles.
Stellar Parallax Distance Calculator — Distance to a star from its measured parallax angle.
Stellar Luminosity Calculator (Stefan\u2013Boltzmann Law) — A star\u2019s luminosity from its radius and surface temperature.
Moon Illumination Estimator — Approximate percentage of the Moon\u2019s visible disc that is illuminated, from days since new moon.
Julian Day Converter — Converts a calendar date to its astronomical Julian Day number.
Habitable Zone Distance Estimator — Rough inner and outer edges of a star\u2019s habitable zone, based on its luminosity.

Earth & Environmental Science (16)

Earthquake Energy Calculator (Richter Scale) — Estimates energy released by an earthquake from its Richter magnitude.
Wind Chill Calculator — Perceived temperature accounting for wind speed, using the NWS formula.
Heat Index Calculator — "Feels like" temperature accounting for humidity, using the Rothfusz regression.
Dew Point Calculator — Dew point temperature from air temperature and relative humidity (Magnus formula).
Air Density Calculator — Density of air from pressure and temperature using the ideal gas law.
Atmospheric Pressure at Altitude Calculator — Estimates air pressure at a given altitude using the barometric formula.
Earthquake Epicenter Distance Calculator — Distance to an earthquake\u2019s epicenter from the P-wave/S-wave arrival time difference.
Fuel Carbon Footprint Calculator — CO₂ emissions from burning a given volume of gasoline or diesel.
River Discharge Calculator — Volumetric flow rate of a river from its cross-sectional area and flow velocity.
Wind Turbine Power Output Calculator — Theoretical power available in wind passing through a turbine\u2019s swept area.
Solar Panel Output Estimator — Estimated electrical power output from a solar panel\u2019s area, efficiency, and sunlight intensity.
Rainfall Volume Calculator — Total volume of water that fell on an area from rainfall depth.
Soil Bulk Density Calculator — Bulk density of a soil sample from its dry mass and volume.
Boiling Point at Altitude Calculator — Estimates water\u2019s boiling point at a given altitude, where air pressure is lower.
Sound Level vs Distance Calculator — How sound level (dB) drops as distance from the source increases (inverse square law).
Safe UV Sun Exposure Time Estimator — Rough estimate of time until sunburn risk, based on the UV index and skin sensitivity.