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🔬 ScienceFree
Boiling point calculator
Get the actual boiling temperature of a solution, not just the rise: water with 1 mol/kg of solute and a Kb of 0.512 boils at 100.512 °C.
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🔬 ScienceFree
Calibration curve calculator
Turn five standards from 0 to 4, with readings from 0.01 to 0.81, into a calibration line with a slope of 0.2, an intercept of 0.01 and an R² of 1.
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🔬 ScienceFree
Chemical name from formula
Type a well-known formula and get the compound's everyday English name: H2O returns Water and C6H12O6 returns Glucose.
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Combustion reaction calculator
Type the carbon and hydrogen counts of a hydrocarbon and get its balanced complete-combustion equation: 3 carbons and 8 hydrogens give C3H8 + 5 O2 → 3 CO2 + 4…
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🔬 ScienceFree
Crude protein calculator
Convert a lab nitrogen result into the crude protein figure used on labels and ration sheets: 16 % nitrogen times the default factor of 6.25 gives 100 %…
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Hydraulic detention time calculator
Work out how long liquid stays in a tank: 100 m³ fed at 10 m³ per hour gives a detention time of 10 hours, and 500 litres at 25 litres per minute gives 20…
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🔬 ScienceFree
Effective nuclear charge calculator
Find the charge an electron really feels once inner electrons shield the nucleus: a sodium 3s electron with Z of 11 and S of 8.8 feels 2.2, not the full 11.
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🔬 ScienceFree
Electrolysis calculator
Turn a current and a run time into grams of product: 0.8 A for 7200 seconds through a silver bath passes 5760 coulombs and plates a little over 6 g of silver.
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🏠 Home, food & hobbiesFree
Witcher monster slayer
A griffin with 320 health against a silver sword dealing 45 per hit needs eight strikes, and 40 points of the last one are wasted: know the count before you…
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🧭 Travel & geographyFree
Wind chill calculator
See how cold the wind makes the air feel on bare skin: −10 °C with a 20 km/h wind feels nearly 8 degrees colder, worked out with the 2001 metric formula used by…
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🗂️ Data & FilesFree
Data transfer time calculator
Enter a file size and a connection speed and see how long the copy takes: 10 MB over a 10 Mbps line takes 8 seconds, because a byte is eight bits.
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🔬 ScienceFree
Entropy calculator
Work out an entropy change by either textbook route: 1000 J absorbed at 300 K raises the entropy by just over 3 J/K, or send standard molar entropies for both…
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Graham's law of diffusion calculator
Helium at 4 g/mol diffuses twice as fast as methane at 16 g/mol, because the rate falls with the square root of molar mass.
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Heat of combustion calculator
Burning 2 kg of a fuel with a calorific value of 42,000,000 J/kg releases 84,000,000 joules. Enter the fuel mass and its heating value in matching units to get…
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🔬 ScienceFree
Langmuir isotherm calculator
See how much of a surface the gas molecules cover: with a Langmuir constant of 2 per atm and a partial pressure of 0.5 atm, the product KP is 1 and the coverage…
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🔬 ScienceFree
Kp calculator
Get the pressure equilibrium constant straight from partial pressures: for 2SO2 + O2 ⇌ 2SO3 with 0.4 atm of SO3, 0.2 atm of SO2 and 0.1 atm of O2, Kp comes out…
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🔬 ScienceFree
Liquid ethylene density calculator
Find how dense liquid ethylene is wherever you measure it: at its normal boiling point of 169.4 K the saturated liquid weighs 568.874115703 kg/m³, and any value…
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🔬 ScienceFree
Miller indices calculator
Intercepts of 2, 3 and 4 on the a, b and c axes name the plane (6 4 3). Enter the three intercepts in lattice-constant units, use zero for an axis the plane…
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🔬 ScienceFree
Mixing ratio calculator
A vapor pressure of 12.27 hPa at a total pressure of 1013.25 hPa gives 7.624468021339 g of water vapor per kilogram of dry air.
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Molar ratio calculator
36 g of water and 32 g of oxygen look alike on a balance, yet they stand in a 2:1 mole ratio. Enter both masses and molar masses to get the two mole amounts…
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🔬 ScienceFree
Neutralization calculator
25 mL of 0.1 M hydrochloric acid needs 25 mL of 0.1 M sodium hydroxide to reach the equivalence point.
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Percent ionic character calculator
An electronegativity difference of 1.9, as in hydrogen fluoride, gives about 59.4 % ionic character: enter the gap between the two atoms and get the ionic and…
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🔬 ScienceFree
Net ionic equation calculator
Silver, nitrate, sodium and chloride ions on one side and solid silver chloride with sodium and nitrate on the other reduce to Ag+(aq) + Cl-(aq) → AgCl(s).
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🔬 ScienceFree
pKa calculator
A Ka of 1 × 10⁻⁷ is exactly pKa 7, and acetic acid's 1.8 × 10⁻⁵ is about 4.74: enter a positive Ka, typed plainly or in scientific notation, and get its pKa for…
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🔬 ScienceFree
Raoult's law calculator
A component at mole fraction 0.4 with a pure vapor pressure of 92 contributes a partial pressure of 36.8 in the same unit, whether torr, kPa or atm.
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🔬 ScienceFree
Q10 calculator
With a Q10 of 2, warming a reaction by 10 degrees doubles its rate, a 100 % increase. Enter Q10 and the temperature change, whether warming or cooling, to get…
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🔬 ScienceFree
Resuspension calculator
10 mg of freeze-dried reagent aimed at 2 mg/mL needs 5 mL of diluent. Enter the dry mass, or a cell count, and the working concentration in matching units to…
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🔬 ScienceFree
Standard temperature and pressure calculator
One mole of gas at 1 atm and 0 °C fills 22.414 L, a little more than the rounded 22.4. Pick volume, moles or pressure as the unknown, give the other two, and…
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🔬 ScienceFree
Titration calculator
If 25 mL of 0.1 M titrant reaches the end point against a 50 mL sample in a one-to-one reaction, the sample is 0.05 M.
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🔬 ScienceFree
Vapor pressure calculator
With water's Antoine constants, 100 °C gives about 760 mmHg, the normal boiling point, and 25 °C about 23.8 mmHg.
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Blast radius calculator
Find the distance at which a charge still produces a chosen peak overpressure, such as about 7 kPa for broken windows or 35 kPa for severe building damage.
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🔬 ScienceFree
Bohr model calculator
Hydrogen's ground state sits at −13.6 eV and one Bohr radius; the next level sits at −3.4 eV and four Bohr radii.
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🔬 ScienceFree
Boost converter calculator
With 12 V in and a 0.5 duty cycle, an ideal boost converter delivers 24 V, a gain of 2. Enter input voltage and duty cycle as a fraction to get the output, gain…
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🔬 ScienceFree
Bridge rectifier calculator
120 V RMS through 0.7 V silicon diodes gives a DC peak of 120 times the square root of 2, minus two diode drops.
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🔬 ScienceFree
Broad-crested weir calculator
A 1.5 m crest under 0.3 m of head forms critical flow at a depth of 0.2 m, two thirds of the head.
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🔬 ScienceFree
Column buckling calculator
Doubling a column's unsupported length cuts its Euler buckling load to a quarter, because length is squared.
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🔬 ScienceFree
Bullet energy calculator
An 8 g bullet at 400 m/s carries 640 J, and doubling the speed would quadruple that energy. Enter mass in kilograms and velocity in metres per second to get…
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🔬 ScienceFree
Buoyancy experiment calculator
A 2 kg object of density 500 kg/m³, held fully under water of 1,000 kg/m³, feels 39.24 N of buoyancy against 19.62 N of weight, so it floats.
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🔬 ScienceFree
Capacitance calculator
Plates of 0.01 m² with a 0.001 m gap in vacuum give 8.854 × 10⁻¹¹ F; double the area or halve the gap and the capacitance doubles.
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🔬 ScienceFree
Capacitor calculator
Two 10 × 10 cm plates 1 mm apart in vacuum, entered as 0.01 m² and 0.001 m, have a capacitance of 8.8541878128 × 10⁻¹¹ F.
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🔬 ScienceFree
Capacitor charge time
With 1 kΩ and 1 µF the time constant is 1 ms, and a 5 V supply charges the capacitor to 2.5 V after ln 2 time constants.
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🔬 ScienceFree
Carburetor CFM calculator
A 350 cubic-inch four-stroke at 6,000 rpm with 85 % volumetric efficiency needs about 516 CFM of carburetor airflow.
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🔬 ScienceFree
Car mass center calculator
Front wheel readings rising from 4,000 to 4,140 when the rear is lifted 0.25 m put a car's centre of mass 0.5 m above the ground.
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🔬 ScienceFree
Centrifuge speed calculator
Turn a protocol's 1,000 × g at a 10 cm rotor radius into the rpm to set, using standard gravity of 9.80665 m/s².
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🔬 ScienceFree
Cloud base calculator
A temperature of 20 °C with a dew point of 12 °C puts the cloud base 1,000 m up: 125 m for every degree of spread.
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🔬 ScienceFree
Compton scattering calculator
A photon scattered at 90° by an electron at rest gains exactly one Compton wavelength, about 2.426 pm, and backscatter at 180° doubles that.
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Compton wavelength calculator
The electron's rest mass of 9.1093837015 × 10⁻³¹ kg gives a Compton wavelength of about 2.426 pm, matching the tabulated value.
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🔬 ScienceFree
Contact lens vertex calculator
A −8 D glasses prescription at 12 mm becomes about −7.30 D at the cornea, while +10 D at 13 mm needs about +11.49 D.
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🔬 ScienceFree
Crawl ratio calculator
A 4.46 first gear, a 2.72 low range and 4.10 axles multiply to a crawl ratio of about 49.74, close to 50:1.
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🔬 ScienceFree
Crossover frequency calculator
A 1 kΩ resistor with a 1 µF capacitor sets a −3 dB corner at 1,000 divided by 2π hertz. Enter R in ohms and C in farads to get the corner frequency, the angular…
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🔬 ScienceFree
Curie's law calculator
A sample with a Curie constant of 2.4 K in a 500 A/m field at 300 K magnetizes to 4 A/m. Enter the Curie constant, the applied field and the absolute…
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🔬 ScienceFree
Cv flow calculator
A valve with a Cv of 10 and a 4 psi drop passes exactly 20 US gallons per minute of water. Enter the catalog Cv, the pressure drop and the specific gravity to…
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🔬 ScienceFree
Cyclotron frequency calculator
A charge of 1 coulomb with 1 kilogram of mass in a 1 tesla field circles at about 0.159 hertz. Enter charge, mass and field strength to get the frequency, the…
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🔬 ScienceFree
Daylight hours calculator
At the equator every day has 12 hours of daylight, while toward the poles a summer day stretches to 24 and a winter day shrinks to 0.
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🔬 ScienceFree
dB gain calculator
A voltage that rises from 1 to 10 is a gain of 20 dB, while the same tenfold step in power is 10 dB.
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🔬 ScienceFree
Debye length calculator
A plasma at 10,000 K with 10¹⁶ electrons per cubic metre shields a charge over less than a tenth of a millimetre.
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Cylinder density calculator
A solid cylinder with mass 1, diameter 2 and height 1 has a volume of π and a density of 1 over π, in matching units.
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🔬 ScienceFree
Density mass volume calculator
A mass of 12 in a volume of 3 has a density of 4. Enter any two of mass, volume and density, leave the unknown blank, and get the missing value plus a label…
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🔬 ScienceFree
Diffraction calculator
Light of 500 nm passing a 0.1 mm slit puts its first dark fringe a little more than a quarter of a degree off the axis.
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🔬 ScienceFree
Electric dipole calculator
Halve the distance to a dipole and the field on its axis grows eight times, while the potential grows four times.
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