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✍️ Text & AIFree
Run-length encoding and decoding tool
«aaabbcccc» encodes to «a3b2c4», and decoding «a3b2c4» gives back «aaabbcccc», letter for letter. Digits and backslashes are escaped so every result decodes…
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✍️ Text & AIFree
Check string rotation
«erbottlewat» is a rotation of «waterbottle»: move its first three letters to the end and you get it.
K
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🔬 ScienceFree
pH acidity classifier
A pH of 3.5 is acidic and sits 3.5 units from neutral. Enter any measured or calculated pH and get its label, acidic below 7, neutral at 7 and basic above 7…
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Battery charge capacity calculator
Find the most charge an electrode material can hold: 0.1 mol with one electron per formula unit stores 9648.53321 C, also given in ampere-hours and…
S
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Buffer pH after acid addition
See how far a buffer's pH falls when strong acid goes in: adding 0.02 mol to 0.1 mol each of weak acid and conjugate base with pKa 4.76 leaves 0.12 mol and 0.08…
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Buffer pH calculator
Get the pH of a weak-acid buffer from pKa and two concentrations: with pKa 4.76 and 0.1 mol/L each of acid and conjugate base, the pH is exactly 4.76.
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Half-cell reduction potential calculator
Adjust a table reduction potential to the ion concentration you actually have: copper at 0.1 mol/L, with E° of 0.34 V and two electrons, reads below 0.34 V.
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Equilibrium moles from total pressure calculator
Turn equilibrium ratios into real amounts: at 2 atm in 10 L and 298.15 K, relative amounts of 1:2:1 become mole fractions of 0.25, 0.5 and 0.25, with partial…
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Electrochemical equivalents calculator
Turn the charge passed through a cell into electrochemical equivalents: 96,485.3321 coulombs is exactly one equivalent, one faraday and one mole of electrons.
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Electrolysis charge calculator
Find the charge that flows during electrolysis: 2.5 A for 3600 seconds carries 9000 coulombs, along with the matching moles of electrons.
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First-order concentration calculator
See how much reactant is left after a first-order reaction has run: 1 mol/L with k of 0.1 per second falls to 0.367879441171 mol/L after 10 seconds, or 1/e of…
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Concentration cell potential calculator
Silver ions at 0.001 and 0.1 mol/L form a concentration cell whose voltage comes from that hundredfold difference, since the standard potential is zero.
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Titration unknown concentration
25 mL of 0.1 N titrant that neutralizes a 50 mL sample means the sample is 0.05 N. Enter the titrant normality, the titrant volume at the end point and the…
S
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pH from hydrogen ion concentration calculator
0.1 mol/L of hydrogen ions is pH 1, a clearly acidic solution: type a known [H+] in moles per litre and get the pH, its acidic, neutral or basic label and the…
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Strong base pH calculator
0.1 mol/L sodium hydroxide gives pH 13: enter the base concentration and how many hydroxide ions each formula unit releases, and get the hydroxide and hydrogen…
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pKa from buffer pH calculator
A buffer at pH 4.76 with equal amounts of acid and conjugate base points to an acid pKa of 4.76: enter the measured pH and the base-to-acid ratio and get the…
S
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pKa from Ka calculator
A Ka of 0.000018 gives a pKa of about 4.74, which the calculator rates as a weak acid: enter any positive Ka and get the pKa, a strength band and each…
S
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pKa + pKb calculator
Acetic acid's pKa of 4.76 means its conjugate base, acetate, has a pKb of 9.24: enter any pKa and get the conjugate pKb from the rule that both add up to 14 in…
S
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Titration pH before equivalence calculator
Mixing 0.0025 mol of strong acid with 0.001 mol of strong base in 0.05 L leaves 0.0015 mol of acid, so hydrogen ions sit at 0.03 M and the pH falls between 1…
S
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Zero-order concentration calculator
Starting at 1 mol/L with k of 0.1 mol/L per second, half the reactant is left after 5 seconds. Enter the initial concentration, the zero-order rate constant and…
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📏 Unit convertersFree
Absolute humidity converter
10 g/m³ of water vapor is 4.36995724033 grains/ft³: the converter moves absolute humidity between six metric and imperial units through kg/m³, with exact…
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Absorbance transmittance converter
An absorbance of 1 means 10 %T: the converter moves readings between A, OD, T, %T and mAU through the rule that absorbance is minus the base-ten log of…
S
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📏 Unit convertersFree
Acoustic impedance converter
1.5 MRayl, the figure often quoted for soft tissue, is 1,500,000 rayls. The converter moves acoustic impedance between seven units, from cgs rayls to Pa·s/m…
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Acres to square feet converter
One acre is exactly 43,560 square feet, and this converter applies that single multiplication to any acreage, so a lot size from a deed or a farm report lands…
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Bar to kPa converter
1 bar is exactly 100 kPa, so 2.5 bar on a European gauge reads 250 kPa on an SI datasheet. This converter applies that exact factor to compressor charts…
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Bar to PSI converter
One bar, exactly 100,000 pascals, is 14.503773773021 psi. This converter applies that full factor instead of a rounded 14.5, so European tyre placards, boiler…
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Barrels to liters converter
One oil barrel is exactly 158.987294928 liters, 42 US gallons by definition. This converter applies that factor to crude and product volumes, so cargo tickets…
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📏 Unit convertersFree
BTU per hour to watts converter
One BTU per hour is 0.293071070172 watts, taken from the exact International Table definition instead of a rounded shortcut.
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📏 Unit convertersFree
BTU to joules converter
One BTU is exactly 1055.05585262 joules under the International Table definition, so a heating load or gas ticket in BTU becomes the joule figure a lab report…
S
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📏 Unit convertersFree
CC to cubic inches converter
16.387064 cc is exactly one cubic inch, because the inch is defined as 2.54 cm. Convert engine displacement, mould cavities or packaging volumes from cc to…
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CFM to cubic meters per hour converter
100 CFM is exactly 169.901079552 m³/h. Turn the airflow on a US fan, nameplate or HVAC schedule into the cubic metres per hour used in European and ISO…
A
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CM to feet converter
152.4 cm is exactly 5 feet, because one foot is defined as 30.48 cm. Convert heights, room sizes or furniture dimensions from centimetres to feet with that…
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Cooling capacity converter
One ton of refrigeration is exactly 12,000 BTU/h, or 3.516852842067 kW: convert chiller and heat-pump capacity between tons, kilowatts, BTU per hour, watts and…
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📏 Unit convertersFree
Cubic feet to gallons converter
One cubic foot is about 7.480519480519 US gallons: convert a tank, aquarium, pool or rain barrel measured in cubic feet into US liquid gallons, with the exact…
A
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Cubic inches to cc converter
2 cubic inches are exactly 32.774128 cc: convert engine displacement badges, syringe notes, small-parts packaging and textbook problems from cubic inches to…
A
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📏 Unit convertersFree
Cups to ml converter
1 US cup is exactly 236.5882365 ml: turn recipe-card cups into the millilitres printed on nutrition labels, measuring jugs, lab glassware and international…
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📏 Unit convertersFree
Current density converter
1 A/mm² is 1,000,000 A/m²: convert current density between nine units, from A/m², A/cm² and A/mm² to A/in², A/ft² and their milli or kilo variants, for cable…
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Damping coefficient converter
100 N·s/m is about 6.852176585679 lbf·s/ft: convert viscous damping coefficients between SI, US customary and cgs units, for shock-absorber datasheets…
S
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Diopter converter
2 diopters means a focal length of 500 mm, half a metre. Convert optical power to focal length in m, cm, mm or inches and back, with negative values marked as…
S
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📏 Unit convertersFree
DPI / PPI resolution converter
10 dots per millimetre equal 254 dpi, because an inch is exactly 25.4 mm. Convert resolution between dpi, ppi, dpcm, ppcm, dpmm and ppmm for print tickets…
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📏 Unit convertersFree
Drill bit size converter
A number 7 drill is 0.201 in, 5.1054 mm or 201 mils, closest to a 13/64 fractional bit. Enter a number, letter, fraction or measured diameter and get every…
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📏 Unit convertersFree
Earthquake magnitude energy converter
A magnitude 6 earthquake radiates about as much energy as 15 thousand tons of TNT. Convert moment magnitude to joules, ergs or tons, kilotons and megatons of…
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📏 Unit convertersFree
Electric dipole moment converter
One debye is 3.33564095198 × 10⁻³⁰ coulomb metres. Convert dipole moments between coulomb metres, coulomb centimetres, debye, millidebye, atomic units…
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Electronvolts to joules converter
One electronvolt is exactly 1.602176634 × 10⁻¹⁹ joules. Enter an energy in eV and get joules with that fixed factor instead of a rounded shortcut, so atomic…
S
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📏 Unit convertersFree
Energy density converter
One watt-hour per litre equals 3.6 million joules per cubic metre. Convert energy per volume between eleven units, from J/m³ and Wh/L to kWh/m³ and BTU/ft³, for…
S
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EV efficiency converter
Read any EV efficiency figure in the unit you know: 250 Wh/mi from a US dashboard is 4 mi/kWh or 25 kWh/100mi, and you see all six units at once, worked out…
S
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📏 Unit convertersFree
Fahrenheit to Kelvin converter
Get the kelvin value of any Fahrenheit reading for physics or chemistry work: 32 °F, where water freezes, is exactly 273.15 K, and -459.67 °F is absolute zero.
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📏 Unit convertersFree
Feet to inches converter
Multiply by exactly 12 to turn feet into inches: 6 ft is 72 in, the same exact definition used on tape measures, building plans and school worksheets.
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📏 Unit convertersFree
Feet to yards converter
Divide by exactly 3 to turn feet into yards: 9 ft is 3 yd, with no rough mental shortcut. Handy for football field markings, fabric orders, golf yardages and…
S
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📏 Unit convertersFree
Jansky flux density converter
Switch spectral flux density between radio-astronomy and physics units: 1 Jy is exactly 10⁻²⁶ W/m²/Hz, and every answer also shows millijansky, microjansky and…
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📏 Unit convertersFree
Fracture toughness converter
Put fracture toughness from any datasheet into the unit you need: 50 MPa·√m is about 45.502 ksi·√in, using the exact inch and the exact pascal-per-ksi factor…
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📏 Unit convertersFree
Gallons to liters converter
One US liquid gallon is exactly 3.785411784 liters, so a 5-gallon drum holds 18.92705892 liters. Use it when a pump, a jug or a bulk container speaks gallons…
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📏 Unit convertersFree
Gbps to Mbps converter
One gigabit per second is exactly 1000 megabits per second, so a 10 Gbps uplink reads as 10000 Mbps on a plan card or a capacity sheet.
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Gemstone carat & point converter
One metric carat is exactly 100 points or 0.2 grams, and this converter moves a stone's weight between carats, points, grams, grains and milligrams in any…
S
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📏 Unit convertersFree
GPM to LPM converter
One US gallon per minute is exactly 3.785411784 liters per minute, so a 10 GPM pump moves 37.85411784 LPM.
S
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📏 Unit convertersFree
Grams to carats converter
One gram is exactly 5 metric carats, because the carat has been fixed at 0.2 grams since 1907. Turn a balance reading in grams into the carat weight that gem…
A
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📏 Unit convertersFree
Hectares to square km converter
100 hectares make exactly 1 square kilometre, and a single hectare is 0.01 km². Turn farm, forest and survey totals into the square kilometres used in atlases…
A
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📏 Unit convertersFree
Hounsfield unit converter
On the Hounsfield scale water is 0 HU and air about -1000, so 1000 HU means twice the attenuation of water, a relative density of 2.
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📏 Unit convertersFree
Hz to RPM converter
50 Hz is 3,000 RPM: multiply hertz by exactly 60 to get the revolutions per minute shown on motor nameplates, tachometers, CNC spindles and generator…
S
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📏 Unit convertersFree
Inches to feet converter
36 inches is exactly 3 feet: turn a tape-measure reading in inches into the feet used on US construction drawings, room dimensions, furniture catalogs and…
S
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