Engineering workbench / 70 working instruments
Find the right instrument for the job.
Free calculators, generators, and guided workbenches for engineers. Search a tool or choose a category to get started.
70 tools ready to use
Gradify: GPA & Graduation Planner
Calculate university GPA, plan a target, and explore grading scales. Includes Delta engineering transcript import, prerequisite checks, semester planning, and PDF reports.
AI Script Generator
A guided, step-by-step builder that generates a complete, runnable Python training project - not a snippet - for YOLO detection, sensor time-series, and edge image classification.
Security Mission
Build, validate, and learn security-tool commands for authorized labs - 22/22 eCPPT objectives covered, with safe shell quoting and secret redaction built in.
Interactive PID Simulator
Tune proportional, integral, and derivative gains with a live physics loop to visualize system response.
Sensor Code Generator
Generate Arduino, ESP-IDF, and PlatformIO boilerplate for common sensors to jumpstart hardware bring-up.
ESP32 Battery Life & Power Estimator
Calculate ESP32 battery life from sleep and active duty cycles. Estimates total runtime and average current draw.
Ohm's Law Calculator
Find voltage, current, or resistance from the other two - the one relationship every circuit obeys.
Voltage Divider Calculator
Two resistors in series split a voltage in proportion to their size - the trick behind most sensor circuits.
RC Time Constant Calculator
How fast a resistor and capacitor charge or discharge together, boiled down to one number: tau.
Capacitive Reactance Calculator
See how much a capacitor resists AC current at a given frequency - resistance's frequency-dependent cousin.
LED Series Resistor Calculator
The one calculation every LED circuit needs, so the LED lights up instead of burning out.
Battery Life Calculator
Estimate how many hours a battery will actually power a project once real-world efficiency is factored in.
RMS Voltage Calculator
Convert an AC signal's peak voltage into the steady DC-equivalent value that actually does the work.
Resistor Color Code Calculator
Turn four color bands into an exact resistance and tolerance, with a picker instead of a chart to squint at.
5-Band Resistor Color Code Calculator
The same idea with one more digit of precision - for the tighter-tolerance resistors that use five bands.
Series Resistor Calculator
Add resistors end to end and their resistances just add up. Enter a few values, get the total.
Parallel Resistor Calculator
Wire resistors side by side and the math flips - flip each value, add them, flip the sum back.
555 Timer Astable Circuit Calculator
Set two resistors and a capacitor to tune a free-running 555 timer's frequency and duty cycle.
555 Timer Monostable Circuit Calculator
One trigger, one pulse - work out exactly how long a 555 timer's one-shot output stays high.
High Pass Filter Calculator
Find the cutoff frequency of an RC filter that lets highs through and blocks the lows.
Low Pass Filter Calculator
The same RC pair, wired the other way round - keep the lows, roll off everything above the cutoff.
Op-Amp Gain Calculator
Two resistors decide how much an op-amp amplifies a signal - and whether it flips polarity on the way.
Air-Core Coil Designer
Estimate a single-layer coil from its dimensions, inspect the winding, and check whether the turns fit.
LC Resonance Designer
Choose a target frequency and capacitor to size an ideal LC tank, with a winding-loss Q estimate.
Band-Pass Filter Designer
Design a buffered RC band-pass circuit and compare stage corners with the complete frequency response.
Cascaded Op-Amp Gain Designer
Build an inverting or non-inverting multi-stage amplifier, see total gain, and compare common op-amp ICs.
Control Design Assistant
Describe the state you need and get a flip-flop, register, counter, or shift-register recommendation with a live state table.
Logic Gate Designer
Set ON/OFF conditions and generate an interactive logic-gate network alongside its complete truth table.
SMPS Design
Explore AC-mains and DC-input isolated flyback supplies, calculate a first-pass DCM operating point, and follow energy through an interactive circuit.
Full-Wave Bridge Rectifier Designer
Estimate rectified DC voltage, ripple frequency, reservoir capacitance, and diode stress for a low-voltage supply.
Linear Regulator Stability Designer
Estimate heat, efficiency and voltage headroom; document capacitor and ESR requirements without a false stability verdict.
Buck Converter Designer
Estimate duty cycle, inductor, output capacitor, ripple current, peak current, and estimated total power loss.
ASCII to HEX Converter
See the raw hex bytes your text actually turns into once a computer gets hold of it.
HEX to ASCII Converter
Turn a string of hex byte values back into the readable text it was encoding.
ROT Explorer
Encode, decode, compare all shifts, and see every letter move through a live alphabet map.
Vigenère & Autokey Cipher
Encode and decode with a repeating Vigenère key or a self-extending Autokey stream, and watch the key stream build letter by letter.
Additive, Multiplicative & Affine Cipher
Encode and decode with a Caesar-style additive shift, a multiplicative cipher, or the combined affine cipher, with the modular-inverse math shown.
Rail Fence & Transposition Cipher
Encode and decode with a zigzag rail fence, a keyword-ordered row transposition, or a keyless columnar transposition, with the grid shown letter by letter.
Playfair Cipher
Build the 5x5 key square from a keyword, split text into digraphs, and encode or decode with the row, column, and rectangle rules shown.
Hill Cipher
Encode and decode with a 2x2 or 3x3 key matrix, multiplying letter blocks mod 26 and inverting the matrix to decode.
MD5 & SHA Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text, computed entirely in your browser.
AES Hex Calculator
Encrypt and decrypt hex data with a 128, 192, or 256-bit AES key in ECB mode, with every SubBytes, ShiftRows, MixColumns, and AddRoundKey step shown.
Capacitor Code-Value Converter
Decode the three-digit number printed on a small ceramic capacitor into a real, usable capacitance.
Capacitance Conversion
Move between farads, microfarads, nanofarads, and picofarads without losing track of the decimal point.
Temperature Conversion
Celsius, Fahrenheit, and Kelvin - three scales for the same thing, converted both ways at once.
Decimal, Binary, Octal and Hex Converter
Type a number in any base and read it back in all four at once - decimal, binary, octal, and hex.
Binary Bit Shift Calculator
Slide a binary number's bits left or right and see exactly how that multiplies or divides it by two.
One's Complement Calculator
Flip every bit in a binary number - the building block behind how computers represent negative numbers.
Two's Complement Calculator
The actual system computers use to store negative numbers in binary, one bit-flip past one's complement.
Log Base 2 Calculator
Find out how many times a number has to double to reach another - the question log base 2 answers.
Binary Calculator
Add, subtract, multiply, or divide two binary numbers directly, without converting to decimal first.
Hex Calculator
The same arithmetic, base 16 - handy for anyone reading memory addresses or register values all day.
Acceleration Calculator
Work out how quickly something is speeding up or slowing down from its change in velocity over time.
Force, Mass & Acceleration Calculator
Newton's second law, solved for whichever of force, mass, or acceleration you don't already know.
Speed Distance Time Calculator
The classic travel formula, rearranged to solve for whichever of the three you're missing.
Wavelength Calculator
Find the physical length of one wave cycle from its speed and frequency - light, sound, or radio.
Frequency-to-Period Calculator
Frequency and period are just each other's reciprocal - flip one to get the other, either direction.
Percentage Change Calculator
See exactly how much something grew or shrank, expressed the way everyone actually talks about it.
Square Root Calculator
The number that multiplies by itself to give you the one you started with.
Cube Root Calculator
Same idea as a square root, one dimension further - the number that multiplies by itself three times.
Orbit & Kepler Calculator
Connect altitude, orbital shape, speed, period and Earth coverage.
GEO Look Angle Calculator
Point an earth-station antenna using azimuth, elevation and slant range.
Satellite Power and Lifetime Calculator
Size beginning-of-life power for degradation and eclipse requirements.
Doppler and Propagation Delay Tool
Separate carrier frequency shift from geometric signal flight time.
Satellite Link Budget Calculator
Combine uplink, downlink and digital performance requirements.
RF Band & Carrier Planner
Compare microwave bands, services, wavelength and weather sensitivity.
Antenna Gain & Aperture Calculator
Relate dish size, aperture efficiency, gain and pointing tolerance.
RF Path, PFD and Received Power Calculator
Follow transmitted power through spreading and receive aperture.
Noise, Noise Figure and G/T Calculator
Refer noise to an input plane and evaluate receiver sensitivity.
Multiple Access, SCPC and TDMA Planner
Allocate limited satellite spectrum, time and transmit power.