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🏗️ Engineering & constructionFree
Current divider calculator
A current of 10 A entering 100 Ω in parallel with 300 Ω splits into 7.5 A and 2.5 A, with the larger share through the smaller resistor.
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🏗️ Engineering & constructionFree
Electric field force calculator
A 2 microcoulomb charge in a 5000 N/C field feels 0.01 N. Enter charge and field with their signs, and the force comes out in newtons, pointing with the field…
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🏗️ Engineering & constructionFree
Electric field calculator
One microcoulomb seen from 10 centimetres gives a field of about 8.99 × 10⁵ N/C, and doubling the distance cuts it to a quarter.
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🏗️ Engineering & constructionFree
Electricity cost calculator
A 1500 W heater running for 2.5 hours uses 3.75 kWh; multiply by your rate per kilowatt-hour and you have the running cost of that session.
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🏗️ Engineering & constructionFree
Frequency period converter
A 50 Hz mains waveform repeats every 0.02 seconds, and a clock edge every microsecond means one megahertz.
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🏗️ Engineering & constructionFree
Inductive reactance calculator
A 0.1 H coil at 50 Hz opposes alternating current with about 31.416 Ω of reactance. Enter the frequency and the inductance to get the reactance in ohms and the…
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🏗️ Engineering & constructionFree
LC resonant frequency calculator
1 mH with 1 µF resonates at about 5033 Hz, roughly 5 kHz. Enter the inductance in henries and the capacitance in farads to get the natural frequency of an…
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🏗️ Engineering & constructionFree
LED resistor calculator
A 5 V supply, a 2 V LED and 0.02 A need a 150 Ω resistor dissipating 0.06 W, so a 0.125 W part is suggested.
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🏗️ Engineering & constructionFree
Magnetic field of a straight wire calculator
A current of 10 A produces 0.00004 T at 5 cm from a long straight wire: enter the current and the perpendicular distance and get the field strength from…
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🏗️ Engineering & constructionFree
Magnetic force calculator
A charge of 0.002 C crossing a 0.5 T field at 500,000 m/s feels 500 N: enter the charge, its speed, the field and the angle between motion and field to get the…
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🏗️ Engineering & constructionFree
Force on a current-carrying wire calculator
A 0.5 m wire carrying 2 A across a 0.4 T field at right angles feels 0.4 N: enter the current, the length inside the field, the field strength and the angle to…
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🏗️ Engineering & constructionFree
555 timer calculator
With 1000 Ω, 2200 Ω and 1 µF, a 555 astable repeats about every 3.7 ms and stays high just under 60 % of the time.
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🏗️ Engineering & constructionFree
555 timer monostable calculator
10 kΩ and 10 µF give a 555 one-shot a 110 ms pulse with the classic 1.1 × R × C rule. Enter the timing resistor and capacitor to get the pulse width in seconds…
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🏗️ Engineering & constructionFree
Non-inverting amplifier calculator
Rf of 10 kΩ over Rg of 1 kΩ gives a non-inverting op-amp a gain of 11, about 20.8 dB, with the signal polarity kept.
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🏗️ Engineering & constructionFree
Parallel-plate capacitor calculator
Two plates of 0.01 m² (100 cm²) 1 mm apart in air make 88.542 pF. Enter the overlap area, the gap and the dielectric constant to get the ideal parallel-plate…
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🏗️ Engineering & constructionFree
Power gain dB calculator
One watt in and two watts out is a gain of about 3 dB. Enter the input and output power in the same unit to get the gain in decibels, the linear ratio and…
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🏗️ Engineering & constructionFree
PWM duty cycle calculator
2 ms on in a 10 ms period is a 20 % duty cycle, and on a 5 V supply that averages 1 V. Enter on-time, period and supply voltage to get the duty fraction…
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🏗️ Engineering & constructionFree
RC filter cutoff calculator
A 1 kΩ resistor with a 1 µF capacitor gives a cutoff near 159 Hz, the −3 dB point where a low-pass RC filter starts cutting higher frequencies and a high-pass…
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🏗️ Engineering & constructionFree
RC time constant calculator
1 kΩ times 1 µF gives a time constant of 1 ms, and five of them, 5 ms, is the usual settling window.
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🏗️ Engineering & constructionFree
Wire resistance calculator
A 10 m copper wire with a 1 mm² cross-section has about 0.168 Ω of resistance. Enter resistivity, length and area to get the DC resistance of any uniform wire…
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🏗️ Engineering & constructionFree
Series resistance calculator
100 Ω, 220 Ω and 330 Ω in series add up to 650 Ω. List the resistors in a single current path and get the one total that replaces the whole chain, for current…
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🏗️ Engineering & constructionFree
RL filter cutoff calculator
A 1000-ohm resistor and a 1 mH inductor put the 3 dB corner of a first-order RL filter at about 159.155 kHz.
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🏗️ Engineering & constructionFree
RL time constant calculator
A 0.1 H coil in series with 50 Ω has a time constant of 2 ms, the time its current needs to cover about sixty-three percent of a step.
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🏗️ Engineering & constructionFree
Slew rate from full-power bandwidth
10 V peak at 100 kHz needs an op-amp that slews at least 6283185 V/s, a little over 6 V/µs. Enter the peak output and the full-power bandwidth to get the…
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🏗️ Engineering & constructionFree
Johnson noise calculator
A 50 Ω resistor at 290 K over a 1 MHz bandwidth produces about 900 nV RMS of Johnson noise. Enter the resistance, absolute temperature and noise bandwidth to…
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🏗️ Engineering & constructionFree
Voltage drop calculator
20 A through 50 m of 12 AWG copper loses a little over 10 V there and back. Enter the gauge, one-way length, current and copper or aluminium to get the…
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🏗️ Engineering & constructionFree
Voltage gain dB calculator
An amplifier that turns 1 V into 10 V has a gain of 20 dB: enter the input and output voltage and get the ratio and the decibel figure, using twenty times the…
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🏗️ Engineering & constructionFree
Watts to dBm calculator
1 W is 30 dBm and 1 mW is 0 dBm: enter a power in watts or milliwatts and get its level in dBm, ten times the base-10 logarithm of the power over one milliwatt.
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🏗️ Engineering & constructionFree
Watts, volts & amps calculator
120 V at 2 A is 240 W: give any two of power, voltage and current and the calculator works out the third from power equals voltage times current, and shows…
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🏗️ Engineering & constructionFree
Frequency to wavelength calculator
A 100 MHz radio carrier has a wavelength of about 3 metres in a vacuum: enter a frequency in hertz or a wavelength in metres and get the other, worked out from…
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🏗️ Engineering & constructionFree
Wheatstone bridge calculator
With ratio arms of 100 and 200 ohms and a known arm of 50 ohms, the unknown Rx is 100 ohms: enter the three known resistances of a balanced bridge and get the…
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🏗️ Engineering & constructionFree
Zener diode resistor calculator
A 5.1 V zener on a 12 V rail feeding 20 mA needs a 345 Ω series resistor that dissipates 0.138 W, so a 0.5 W part is suggested.
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⚙️ Developer UtilitiesFree
Affine cipher
Encrypt or decrypt with the affine cipher, which multiplies each letter's position by a and adds b: with a set to 5 and b to 8, AFFINE CIPHER becomes IHHWVC…
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⚙️ Developer UtilitiesFree
ASCII code lookup
Look up any ASCII character or code and see it every way at once: A is decimal 65, hex 41, octal 101 and binary 1000001.
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⚙️ Developer UtilitiesFree
Atbash cipher
Mirror every Latin letter across the alphabet, A to Z and B to Y, so Hello, World! becomes Svool, Dliow! and running it again brings the original back.
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⚙️ Developer UtilitiesFree
Autokey cipher
Encrypt or decrypt with the Autokey cipher, where a short primer is followed by the message itself: with primer KEY, Hello, World! becomes Rijss, Hzfhr! because…
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⚙️ Developer UtilitiesFree
Base16 RFC 4648 encoder & decoder
Encode text as RFC 4648 Base16, the standard uppercase hex where every byte becomes two characters: Hello turns into 48656C6C6F.
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⚙️ Developer UtilitiesFree
Base32 encoder & decoder
Encode text as RFC 4648 Base32, the A–Z and 2–7 alphabet behind authenticator secrets: Hello becomes JBSWY3DP.
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⚙️ Developer UtilitiesFree
Base58 encoder & decoder
“Hello World” becomes JxF12TrwUP45BMd in Base58, using the Bitcoin alphabet of 58 characters without zero, capital O, capital I or lowercase l, so codes stay…
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⚙️ Developer UtilitiesFree
Flickr Base58 encoder & decoder
“Hello World” becomes iXf12sRWto45bmC in Flickr Base58, the alphabet behind flic.kr short links: no 0, O, I or l, and lowercase before uppercase, the reverse of…
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⚙️ Developer UtilitiesFree
Text to Base64
“Hello, world!” becomes SGVsbG8sIHdvcmxkIQ== in standard Base64, with the classic plus, slash and equals-sign padding, and any valid Base64 string turns back…
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⚙️ Developer UtilitiesFree
Ascii85 / Base85 encoder
“Hello, world!” becomes 87cURD_*#TDfTZ)+T in Adobe Ascii85, also called Base85, which packs every four bytes into five printable characters, denser than Base64…
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⚙️ Developer UtilitiesFree
Beaufort cipher
With the keyword KEY, “Hello, World!” becomes “Danzq, Cwnnh!”, and the same keyword turns it back, because the Beaufort cipher subtracts each letter from the…
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⚙️ Developer UtilitiesFree
Bifid cipher
With the keyword SECRET, HELLO becomes HKNFO in the Bifid cipher: Félix Delastelle's keyed 5×5 Polybius square splits each letter into row and column digits and…
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⚙️ Developer UtilitiesFree
Text to binary converter
“Hi” becomes 01001000 01101001: each byte of your text written as eight zeros and ones, one group per byte, while accents and emoji take two to four groups in…
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⚙️ Developer UtilitiesFree
Braille translator
Type “Hello” and get ⠠⠓⠑⠇⠇⠕: a capital sign followed by five letter cells, ready to paste into a document without any special font.
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⚙️ Developer UtilitiesFree
Caesar cipher
With a shift of 3, “Hello, World!” becomes “Khoor, Zruog!”: every Latin letter moves three places and the alphabet wraps from Z back to A, while spaces and…
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⚙️ Developer UtilitiesFree
Gronsfeld cipher
With the key 31415, ATTACKATDAWN encrypts to DUXBHNBXEFZO: each digit shifts the next letter forward by that many places, and the key repeats until the message…
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⚙️ Developer UtilitiesFree
Text to hex converter
Hello becomes 48656c6c6f: each of its 5 bytes turns into two hex digits, and accented letters or emoji expand to their full UTF-8 bytes.
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⚙️ Developer UtilitiesFree
Keyboard shift cipher
With an offset of one, hello becomes jraap: each letter slides one key to the right on its own QWERTY row, and the l wraps around to the a.
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⚙️ Developer UtilitiesFree
Leetspeak translator
Hello World becomes H3110 W0r1d with the classic leetspeak table: e turns into 3, l into 1 and o into 0, while spaces and punctuation stay in place.
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⚙️ Developer UtilitiesFree
Multiplicative cipher
With key 5, HELLO becomes JUDDS: each letter is multiplied by your key modulo 26, and decrypting uses its inverse, 21.
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⚙️ Developer UtilitiesFree
NATO phonetic alphabet
SOS spelled for radio is Sierra Oscar Sierra: type letters and digits to get the NATO code words, or paste code words to get the text back.
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⚙️ Developer UtilitiesFree
Nihilist cipher
HELLO, encrypted with the keyword ZEBRAS and the key 1234, becomes 43 46 46 68 54. The keyword builds a five-by-five letter square, the key adds a repeating…
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⚙️ Developer UtilitiesFree
Text to octal converter
Hello becomes 110 145 154 154 157: each UTF-8 byte is written as a three-digit octal group. Pick spaces, colons, commas, pipes or no separator at all, and turn…
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⚙️ Developer UtilitiesFree
Playfair cipher
With the keyword MONARCHY, INSTRUMENTS encrypts to GATLMZCLRQXA: the letters are split into pairs, an X fills the odd end, and each pair is swapped inside a…
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⚙️ Developer UtilitiesFree
Polybius square cipher
HELLO becomes 2315313134 on the Polybius square: each letter is replaced by the row and column of its cell in a five-by-five grid, with I and J sharing cell 24.
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⚙️ Developer UtilitiesFree
Punycode converter
The label münchen becomes xn--mnchen-3ya, the plain ASCII form that domain records, certificates and older systems accept.
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⚙️ Developer UtilitiesFree
Rail fence cipher
Write a message in a zigzag across rails and read it row by row: with 3 rails, WEAREDISCOVEREDFLEEATONCE becomes WECRLTEERDSOEEFEAOCAIVDEN, and the same rail…
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⚙️ Developer UtilitiesFree
ROT13 encoder
Hello, World! becomes Uryyb, Jbeyq! and the same step turns it back: every Latin letter moves 13 places while punctuation stays put.
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