Developer Tools

  • Contrast Ratio Calculator
    Calculate WCAG color contrast ratio from RGB values. Check AA and AAA accessibility compliance using relative luminance: (L1+0.05)/(L2+0.05).
  • Password Entropy Calculator
    Calculate password entropy in bits from length and character set. See strength and estimated crack time using the formula bits = length × log2(charset).
  • Hamming Distance Calculator
    Calculate the Hamming distance between two strings or bit sequences — the number of positions where the symbols differ. Free, instant, and accurate.
  • Chmod Calculator
    Convert Unix file permissions to chmod octal notation. Tick read, write, execute for owner, group, and other to get the 3-digit mode and symbolic string.
  • Amdahl's Law Calculator
    Calculate the theoretical speedup of a program with Amdahl's Law from the parallel portion and the number of processors or speedup factor.
  • Shannon Entropy Calculator
    Calculate Shannon entropy (in bits) from a probability distribution or raw counts using H = −Σ pi log2(pi). Get entropy, max entropy, and efficiency.
  • Password Combination Calculator
    Calculate the total number of possible password combinations and entropy in bits from your character set size and password length.
  • Leaky ReLU Activation Function Calculator
    Compute the Leaky ReLU activation f(x)=x if x>0 else alpha*x. Sweep a range of x values, get a table of (x, f(x)) pairs and plot the curve.
  • MIPS to Average Instruction Execution Time Converter
    Convert between a CPU's MIPS rating and the average time to execute one instruction, in both directions, with results in s, ms, us, ns and ps.
  • ReLU (Rectified Linear Unit) Calculator
    Compute the ReLU activation function f(x) = max(0, x) for any real number. Free online Rectified Linear Unit calculator for neural networks.
  • Date to UNIX Time Calculator
    Convert any calendar date and time to UNIX time (UNIX timestamp) — seconds since 1970-01-01 00:00:00 UTC. Supports any UTC offset, including fractional and negative.
  • Table Three-Function Evaluator (3 Variables x, y, z)
    Evaluate up to three math expressions f, g, h over every row of an x, y, z data table. Supports sqrt, trig, log, pow and more. Free online tool.
  • Table Two-Function Evaluator (Two Variables)
    Evaluate two custom expressions f(x,y) and g(x,y) over a table of (x,y) data rows. Supports sqrt, trig, log, atan2 and more. Free online tool.
  • Test Density and Bug Density Calculator
    Compute test density and bug density per LOC and per KLOC from your test count, bug count and source code size. Free software quality metric tool.
  • Power of 2 Calculator
    Calculate 2 raised to any power (2^n) instantly. Enter an exponent and get the exact value, including negative and decimal exponents.
  • Table Function Evaluation (3 Variables)
    Evaluate a custom formula f(x, y, z) across every row of a 3-column data table. Batch expression evaluator with sqrt, sin, log, pow and more.
  • One's Complement Calculator
    Calculate the one's complement of any decimal number by flipping every bit within a 4, 8, 16, or 32-bit width. See binary and decimal results instantly.
  • Base-N Conversion Calculator
    Convert a non-negative integer between decimal, hexadecimal, octal, senary (base 6) and binary all at once. Universal base-N number converter for whole numbers.
  • Binary Addition Calculator
    Add two binary numbers instantly. See the binary sum plus the decimal values and decimal total. Free, accurate base-2 addition calculator.
  • Bitwise NOR Calculator
    Compute the bitwise NOR of two integers, result = ~(A | B), at 8, 16, 32 or 64-bit width with decimal and binary output.
  • Luhn Algorithm Calculator
    Check if a number passes the Luhn (mod 10) algorithm. Validate credit card numbers, IMEIs and IDs with a step-by-step checksum breakdown.
  • IP Address CIDR Range Calculator
    Enter an IPv4 address and CIDR prefix to compute the network, broadcast, usable host range, subnet mask, wildcard mask, and host counts.
  • Binary Division Calculator
    Divide two binary numbers and get the quotient and remainder in binary and decimal. Free, instant binary division calculator with worked steps.
  • Binary Multiplication Calculator
    Multiply two binary numbers instantly. Get the binary product plus the decimal equivalents of each input and the result, with worked examples.

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