Digital Design Tools

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Register Description Language (RDL) & Register CompilerCompile and generate hardware register maps, SystemRDL, Verilog/HDL, C/C++ firmware headers, Rust drivers, UVM RAL models, and Markdown documentation from CSV, TOML, SystemRDL, or JSON IR.

Electronics Tools

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Active Filter CalculatorDesign an Active Low Pass or High Pass Filter using an Operational Amplifier.

Battery Life CalculatorEstimate how long a battery will last for a given load.

Energy Storage CalculatorCalculate the energy stored in a Capacitor or an Inductor.

LED Resistor CalculatorCalculate the value of the series resistor needed for an LED.

Ohm's Law CalculatorCalculate Voltage, Current, Resistance, or Power using Ohm's Law.

Parallel Resistor CalculatorCalculate the total equivalent resistance of resistors connected in parallel.

Passive Filter CalculatorDesign a simple Passive RC Low Pass or High Pass Filter.

RC Time Constant CalculatorCalculate the RC time constant (τ) of a resistor-capacitor circuit.

Reactance CalculatorCalculate Inductive Reactance (XL) and Capacitive Reactance (XC) for a given frequency.

Resistor Color Code CalculatorDecode the color bands on 4-band and 5-band resistors to find their resistance.

Time-Frequency ConverterConvert between Frequency (Hertz) and Period (Seconds Measure).

Voltage Divider CalculatorCalculate the output voltage of a resistive voltage divider circuit.

Wheatstone Bridge CalculatorCalculate the unknown resistor value (Rx) in a balanced Wheatstone Bridge circuit.

dB to Power Ratio ConverterConvert between power ratios and decibels.

dB to Voltage Ratio ConverterConvert between voltage ratios and decibels.

dBm to Power ConverterConvert between dBm and Milliwatts (mW) with this converter.

Finance Tools

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Currency Converter ToolEasily convert between major world currencies with live exchange rates.

Loan EMI CalculatorPlan your home, car, or personal loan monthly payments with this free EMI calculator.

SIP CalculatorCalculate the future value of your Systematic Investment Plan (SIP) investments.

SWP CalculatorPlan your retirement or regular income with the Systematic Withdrawal Plan (SWP) Calculator.

Random & Entropy Tools

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Full Randomness Meta-SuiteAll 8 randomness test batteries in a single streaming pass — ENT, NIST SP 800-22, BSI AIS 31, Dieharder, NIST SP 800-90B, TestU01 SmallCrush, PractRand, and gjrand. One file drop, complete multi-standard evaluation.

Quick Screen & Health Diagnostic SuiteInstant single-pass randomness screening and health diagnostics across 5 critical dimensions: Information, Frequency, Bit Distribution, Sequential Patterns, and Geometry.

Fourmilab ENT Randomness BatteryJohn Walker's classic Fourmilab ENT randomness evaluation suite. Computes Shannon entropy, Chi-Square distribution, arithmetic mean, Monte Carlo Pi estimation, and serial correlation.

Test Stream GeneratorGenerate synthetic binary test streams from 11 deterministic and stochastic sources — Sequential Ramp, Fixed Constant, LFSR, De Bruijn Cycle, LCG, Xoshiro256**, Gaussian, Poisson, NIST AES CTR_DRBG, NIST SHA-256 Hash_DRBG, and ChaCha20. Export as .bin, .txt, .hex, .bits, or .csv.

NIST SP 800-22 Randomness Test SuiteNIST Special Publication 800-22 Rev. 1a statistical test suite for randomness. Evaluates binary sequences across 15 statistical tests covering frequency, block structure, runs, spectral properties, linear complexity, and template matching.

NIST SP 800-90B Min-Entropy SuiteNIST Special Publication 800-90B min-entropy estimation suite. Quantifies the worst-case unpredictability of physical entropy sources via 10 estimators across Non-IID and Predictor tracks — the gold standard for FIPS 140-3 entropy source validation.

BSI AIS 20 / AIS 31 Physical TRNG SuiteGerman Federal Office for Information Security (BSI) AIS 20 / AIS 31 physical true random number generator test suite. Evaluates hardware entropy sources across 9 deterministic criteria: T0 Disjointness through T8 Shannon Entropy.

Dieharder Statistical Test BatteryRobert G. Brown's Dieharder battery — a modern, rigorous extension of Marsaglia's original Diehard tests. Evaluates random number generators across 12 tests spanning spatial, runs, template, frequency, complexity, and distribution dimensions.

TestU01 SmallCrush BenchmarkPierre L'Ecuyer & Richard Simard's TestU01 academic PRNG benchmark suite — SmallCrush battery. Evaluates pseudo-random generators across 10 stringent statistical tests including birthday spacings, collision, gap, poker, coupon collector, weight distribution, matrix rank, Hamming independence, and run tests.

PractRand High-Throughput PRNG SuiteChris Doty-Humphrey's PractRand — a high-throughput PRNG testing framework designed to run continuously and detect failure at arbitrary data volumes. Evaluates generators across gap, folding floating-point, Bayesian count frequency, differential count, binary matrix rank, and autocorrelation tests.

gjrand Statistical Test SuiteDavid Blackman's gjrand battery — a focused suite of 10 multi-dimensional collision, probability, distance, gap, and run-length tests designed specifically to expose weaknesses in modern high-speed PRNGs at 16-bit and 32-bit resolution.

Unit Conversion Tools

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Angle Converter ToolConvert between Degree, Radian, Gradian with this angle converter tool.

Area Converter ToolConvert between Square Meter, Hectare, Acre, Square Foot, and other area units.

Charge Converter ToolConvert between Coulomb, Ampere-hour, Milliampere-hour and other electric charge units.

Current Converter ToolConvert between Ampere, Milliampere, Microampere and other electric current units.

Data Converter ToolConvert between Bit, Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and other data units.

Energy Converter ToolConvert between Joule, Calorie, Kilowatt-hour, BTU and other energy units.

Force Converter ToolConvert between Newton, Kilogram-force, Pound-force, Dyne and other force units.

Frequency Converter ToolConvert between Hertz, Kilohertz, Megahertz, Gigahertz, RPM and other frequency units.

Length Converter ToolConvert between Meter, Kilometer, Inch, Foot, Mile and other length units.

Power Converter ToolConvert between Watt, Kilowatt, Horsepower, BTU/hour and other power units.

Pressure Converter ToolConvert between Pascal, Bar, PSI, Atmosphere and other pressure units.

Speed Converter ToolConvert between Meters per Second, KM/h, MPH, Knot and other speed units.

Temperature Converter ToolConvert between Celsius, Fahrenheit and Kelvin temperature scales.

Time Converter ToolConvert between Second, Minute, Hour, Day, Year and other time units.

Voltage Converter ToolConvert between Volt, Millivolt, Microvolt, Kilovolt and other voltage units.

Volume Converter ToolConvert between Cubic Meter, Liter, Gallon, Cup and other volume units.

Weight Converter ToolConvert between Kilogram, Gram, Pound, Ounce and other weight/mass units.