Miscellaneous

  • Gematria Calculator
    Calculate the gematria value of any word or name using standard English gematria (A=1..I=9, J=10, K=20...) or simple ordinal (A=1..Z=26) ciphers.
  • Horse Color Calculator
    Predict foal coat color probabilities from sire and dam colors (bay, black, chestnut). Enter parents to see likely bay, black, or chestnut.
  • Greek Gematria (Isopsephy) Calculator
    Calculate the Greek gematria (isopsephy) value of any Greek word or phrase. Each letter (alpha=1 ... omega=800) is summed instantly.
  • Leap Year List Calculator
    Generate a chronological list of the next N leap years from any start year (AD 1582+) using the Gregorian leap-year rule, including century exceptions.
  • Mid Range Calculator
    Calculate the mid range of a set of numbers easily with our online Mid Range Calculator. Visualize your data and understand the central tendency of your dataset.
  • NAND Calculator
    Use our free online NAND Calculator to quickly compute logical NAND operations. Input binary values and get instant results with a visual NAND gate representation. Perfect for students, engineers, and digital logic enthusiasts.
  • OpenAI GPT Calculator
    Estimate OpenAI GPT API costs by entering input and output tokens and selecting a model. Get a quick projected price for your token usage.
  • Numerology Year Calculator
    Enter your full name, birth date, and a target year to calculate your numerology for that period, including your Personal Year number.
  • Pluto Time Calculator
    Convert Earth time to Pluto time with our Pluto Time Calculator. Discover how time passes on Pluto and visualize the percentage of a Pluto day. A fun astronomical tool for space enthusiasts!
  • Reverse Percentage Calculator
    Easily calculate the original value before a percentage increase with our reverse percentage calculator. Find out what a number was before it increased by a certain percentage.
  • Ring Size Calculator
    Input finger circumference (mm), choose US, UK, or EU, and get your ring size instantly for a comfortable, accurate fit.
  • Books vs e-Books Footprint Calculator
    Compare the carbon footprint of printed books versus e-books on an e-reader. Find your break-even point and which option saves more CO₂.
  • Sled Ride Calculator
    Calculate forces and energy in sled motion on an inclined plane. This physics calculator determines gravity, friction, acceleration, and energy for sledding scenarios.
  • 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.
  • Christian Funeral & Memorial Date Calculator (Japan)
    Compute Japanese Christian (Catholic/Protestant) memorial service dates from a date of death. Supports Western and Japanese era years (Meiji to Reiwa).
  • Tangent Line Calculator
    Calculate the tangent line for simple polynomial functions. Find the slope, y-intercept, and equation of the tangent line at any point for functions of the form f(x) = ax^n.
  • Pie Chart Maker
    Free pie chart maker: enter category labels and values to get each slice's percentage share and angle in degrees, plus a drawn pie chart.
  • Window Blind Size Calculator
    Calculate the correct window blind size for inside or outside mount. Enter window dimensions and get the exact blind width and height in inches.
  • D'Hondt Method Seat Allocation Calculator
    Allocate legislative seats among parties in proportion to votes using the D'Hondt (highest-averages / Jefferson) method. Universal apportionment tool.
  • Peoria Golf Handicap Calculator
    Calculate a one-day golf competition handicap with the Peoria, Double (New) Peoria, or New-New Peoria hidden-hole method. Assumes course par 72, 80% allowance.
  • How Many Generations Ago an Era Was
    Estimate how many generations ago a historical era was. Japanese-period presets auto-fill start/end years; divides years elapsed by years per generation.
  • Chinese Zodiac Calculator
    Enter your birth year to instantly see your Chinese zodiac animal sign. Quick lookup using the 12-year cycle based on your year of birth.
  • Tie Length Calculator
    Find your ideal necktie length based on your height. Scales a standard 57-inch tie linearly so it ends at the perfect spot for any height.
  • Tablecloth Size Calculator
    Calculate the ideal tablecloth size from your table dimensions and desired drop. Get the exact length and width you need for any rectangular table.

Categories