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➗ MathFree
Divisors of a number
12 has 6 divisors, 1, 2, 3, 4, 6 and 12, and they add up to 28. Enter any positive whole number up to one trillion and get the full ordered list, the count and…
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➗ MathFree
Is prime checker
Checks whether a whole number is prime and, if not, shows the smallest divisor that proves it: 97 comes back prime, with no divisor at all.
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🔬 ScienceFree
Acoustic resonance Q factor calculator
Rates how sharp an acoustic resonance is: a 440 Hz peak with a 2.2 Hz half-power bandwidth has a Q of 200, so it rings for many cycles before fading.
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🔬 ScienceFree
Lensmaker's equation
Check a textbook lens in seconds: crown glass near index 1.5 with symmetric radii of 0.1 m and -0.1 m focuses at 0.1 m, a converging lens of 10 diopters, under…
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🔬 ScienceFree
Wavelength calculator
Divide the wave speed by the frequency and get the wavelength in metres: sound at 340 m/s with a 440 Hz pitch spans a little over three quarters of a metre per…
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➗ MathFree
Durbin-Watson statistic calculator
Six residuals that keep switching sign give squared differences of 3.19 against squared residuals of 1.19, a Durbin-Watson d above 2.5 that hints at negative…
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➗ MathFree
Tukey HSD post-hoc
Find out which group means differ after an ANOVA: for groups averaging 2, 6 and 4, Tukey's test flags all three pairs as different at the 0.05 level.
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✍️ Text & AIFree
Reverse line order
The lines “first line”, “second line” and “third line” come back as “third line”, “second line”, “first line”: the order flips, while each line stays readable…
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🔬 ScienceFree
Charles's law calculator
2 litres of gas at 300 K warmed to 600 K expands to 4 litres, because volume over kelvin temperature stays constant at fixed pressure.
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🧭 Travel & geographyFree
EV trip charging cost
A 250 km drive at 18 kWh per 100 km draws 45 kWh, and the tool turns that into the trip's charging cost at your electricity price, plus the cost per kilometer.
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➗ MathFree
Half-angle calculator
Enter a full angle of 90° and get a half-angle of 45° with sine and cosine of 0.707106781187 and a tangent of 1.
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➗ MathFree
Rectangular to polar converter
Turn a point on the plane into distance and direction: the point (3, 4) lies 5 units from the origin, with its angle in quadrant I.
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➗ MathFree
Midline of a sinusoidal function
Get the line a sine or cosine wave swings around: a vertical shift of 3 puts the midline at height 3, and with an amplitude of 2 the wave peaks at 5 and bottoms…
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📏 Unit convertersFree
EMC field strength converter
1 V/m is 120 dBµV/m, the scale EMC labs report in. Convert field strength between volts per metre and its prefixed forms, the dBµV/m, dBmV/m and dBV/m log…
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🔬 ScienceFree
First-order reaction time calculator
Find the time a first-order reaction needs to fall from one concentration to another: with k of 0.1 per second, 1 mol/L drops to 0.5 mol/L in about 6.931…
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📏 Unit convertersFree
Absorbed dose converter
1 gray is exactly 100 rad: the converter passes every dose through grays to move between Gy, mGy, rad and erg/g, so old rad charts, imaging reports and…
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📏 Unit convertersFree
Acceleration converter
9.80665 m/s² is exactly 1 g: the converter links m/s², ft/s², standard gravity and the gal through one exact SI bridge, then shows your value in all four units…
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📏 Unit convertersFree
Mole unit converter
1 mole is 1,000 millimoles, and one pound-mole is exactly 453.59237 moles. Convert an amount of substance between mol, mmol, µmol, kmol and lb-mol, and see the…
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📏 Unit convertersFree
Angle converter
180 degrees are π radians, or 3.14159265359. Convert angles between degrees, radians, gradians, arcminutes, arcseconds and turns, with the value in radians and…
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📏 Unit convertersFree
Angular acceleration converter
1 rad/s² equals 57.2957795131 deg/s² and 572.957795131 rev/min². This converter handles rotational, not straight-line, acceleration and shows your value in all…
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📏 Unit convertersFree
Angular velocity converter
60 RPM is 6.2831853072 rad/s, one full turn every second. Convert rotation rates between rad/s, deg/s, RPM and revolutions per second, so a motor nameplate, a…
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📏 Unit convertersFree
Area converter
100 square metres are 1,076.391041671 square feet. Convert any area between m², ft², acres, hectares, square miles and km² with fixed international factors, so…
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📏 Unit convertersFree
Astronomical distance converter
Light-years, parsecs and astronomical units in one converter: 1 AU is 149,597,870.7 km, and every value passes through exact definitions, so solar-system…
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📏 Unit convertersFree
Blood glucose converter
100 mg/dL is 5.5499439456 mmol/L: the converter divides or multiplies by the clinical constant 18.0182, so a reading from a US meter and a European lab report…
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📏 Unit convertersFree
Bra size converter
A US 34C is a 75C in Europe, a 90C in France and a 12C in Australia. Type one size and see its label in all five systems, with cups after D matched by volume…
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📏 Unit convertersFree
Capacitance converter
One microfarad is 1,000,000 picofarads. Convert any capacitance between farads, millifarads, microfarads, nanofarads and picofarads and see the value in all…
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📏 Unit convertersFree
Catalytic activity converter
One microkatal equals 60 enzyme units (U). Convert catalytic activity between katals, microkatals, nanokatals and enzyme units, with the step through katals…
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📏 Unit convertersFree
Cholesterol unit converter
200 mg/dL of total cholesterol is about 5.17 mmol/L. Convert total, HDL or LDL cholesterol between US milligrams per decilitre and SI millimoles per litre with…
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📏 Unit convertersFree
Clothing size converter
A US women's 8 is a UK 12 and an EU 38. Enter a size and its system to get the matching US, UK, EU and S/M/L labels from a fixed international chart, for…
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📏 Unit convertersFree
Molar concentration converter
1 mol/L is 1,000 mmol/L: convert molar concentrations between mol/L, mmol/L, µmol/L and mol/m³ so lab reports, kit inserts and SI engineering datasheets can be…
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📏 Unit convertersFree
Conductance converter
1 millisiemens is 1,000 microsiemens: convert electrical conductance between siemens, millisiemens, microsiemens and mhos, and see the same value in all four…
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📏 Unit convertersFree
Data transfer rate converter
100 Mbps is 12.5 MB/s: convert bandwidth between bits, kilobits, megabits and gigabits per second and bytes or megabytes per second, so an ISP plan, speed test…
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📏 Unit convertersFree
Digital storage converter
1,024 bytes are exactly 1 KiB: convert file and memory sizes between bytes, KB, MB, GB and TB in powers of 1,000 and KiB, MiB, GiB and TiB in powers of 1,024…
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📏 Unit convertersFree
Density converter
1000 kg/m³ is exactly 1 g/cm³. Enter a density in kg/m³, g/cm³, lb/ft³ or pounds per US gallon and read the same value in all four units at once, for lab…
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📏 Unit convertersFree
Dynamic viscosity converter
One pascal-second is 1000 centipoise. Convert dynamic viscosity between pascal-seconds, poise, centipoise and pound-force seconds per square foot for fluid…
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📏 Unit convertersFree
Electric charge converter
One coulomb is 1000 millicoulombs. Convert charge between coulombs, millicoulombs, microcoulombs, ampere-hours, milliampere-hours and elementary charges, so…
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📏 Unit convertersFree
Electric current converter
One kiloampere is 1000 amperes, and one microampere is a millionth of an ampere. Convert current between amperes, milliamperes, microamperes, kiloamperes and…
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📏 Unit convertersFree
Electric field strength converter
One volt per mil is about 39370 volts per metre, because a mil is a thousandth of an inch. Convert field strength between V/m, V/cm, kilovolts per metre and…
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📏 Unit convertersFree
Energy converter
One kilowatt-hour is 3,600,000 joules, and one food Calorie is 4184 joules. Convert energy between joules, kilojoules, calories, kilocalories, watt-hours…
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📏 Unit convertersFree
Fahrenheit to Celsius converter
Turn a US weather, thermostat or oven reading in Fahrenheit into Celsius with the exact formula: 32 °F is 0 °C and 212 °F is 100 °C, without the…
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📏 Unit convertersFree
Volume flow rate converter
Switch a flow rate between L/s, m³/h, US gallons per minute and cubic feet per minute: 1 L/s is 15.850323141489 gpm.
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📏 Unit convertersFree
Force converter
Switch a force between newtons, kilonewtons, dynes, pounds-force, kilograms-force and poundals: 1 lbf is 4.4482216152605 N, worked out through newtons with…
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📏 Unit convertersFree
Frequency converter
Switch a frequency between Hz, kHz, MHz, GHz, RPM and radians per second: 1000 Hz is 1 kHz, and every conversion runs through hertz with fixed factors.
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📏 Unit convertersFree
Frequency wavelength converter
Find the wavelength of any frequency, or the reverse, with wavelength equal to speed divided by frequency. In vacuum, 300,000,000 Hz gives 0.9993081933 m.
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📏 Unit convertersFree
Fuel economy converter
Restate a fuel economy figure on the scale your market uses: 30 US MPG is 7.84048611111 L/100km, 12.7543112229 km/L or 36.0284977651 UK MPG, all shown together.
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📏 Unit convertersFree
Fuel price unit converter
Restate a pump price per US gallon, per imperial gallon or per liter: 3.5 per US gallon is 0.924602183254 per liter in the same currency, because one US gallon…
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📏 Unit convertersFree
Grain weight converter
One grain is exactly 64.79891 milligrams, so a 100-grain powder charge weighs 6.479891 grams. Move any weight between grains, grams, milligrams and avoirdupois…
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📏 Unit convertersFree
Hat size converter
A US 7 fitted hat is a UK 6 7/8, a European 56 and a head of 56 cm, about 22.05 inches. Enter the size you know in any of those systems and see the others in…
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📏 Unit convertersFree
Heat flux density converter
A heat flux of 1000 W/m² is about 317 BTU per hour per square foot, or 0.1 W/cm². Enter one value and see it in all four units at once, for building envelopes…
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📏 Unit convertersFree
Heat transfer coefficient converter
A film coefficient of 1 W/(m²·K) is 0.1761101837 BTU/(h·ft²·°F), and 1 BTU/(h·ft²·°F) is 5.6782633412 W/(m²·K).
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📏 Unit convertersFree
Illuminance converter
500 lux is 46.45152 foot-candles: move a light level between lux, foot-candles, phot and lumens per square metre when an office standard, an old facilities…
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📏 Unit convertersFree
Inductance converter
1 henry is 1000 millihenries: move an inductance between H, mH, µH, nH and pH while you read a coil datasheet, a PCB inductor catalog, an RF matching note or a…
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📏 Unit convertersFree
Gold karat converter
18 karat gold is 750 fineness and 75 percent pure: enter a purity on any of the three scales and see the other two at once, for reading hallmarks, pricing scrap…
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📏 Unit convertersFree
Kinematic viscosity converter
Convert kinematic viscosity between m²/s, stokes, centistokes and ft²/s and see all four at once: 1 m²/s equals 10000 stokes or 1000000 centistokes.
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📏 Unit convertersFree
Luminance converter
Compare screen and projector brightness across old and modern units: 100 nits equal 29.186350796 foot-lamberts.
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📏 Unit convertersFree
Luminous flux converter
Move a lumen figure to the prefix your datasheet uses: 800 lumens are 0.8 kilolumens. Five flux units, from microlumens to megalumens, for LED packages, product…
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📏 Unit convertersFree
Luminous intensity converter
Put an LED's millicandela rating and a lamp's candlepower on the same scale: 1 candela is 1000 millicandela, and one candlepower counts as one candela.
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📏 Unit convertersFree
Magnetic flux converter
Move magnetic flux between SI and old CGS units in one step: 1 weber is exactly 100,000,000 maxwell.
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📏 Unit convertersFree
Magnetic flux density converter
Switch a magnetic field reading between SI and CGS: 1 tesla is exactly 10,000 gauss and 10,000,000 milligauss.
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📏 Unit convertersFree
Mass converter
Enter a weight once and see it in seven units: 1 kilogram is 2.20462262185 pounds, 35.2739619496 ounces and 1000 grams.
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