Utilities

  • AC Tonnage Calculator
    Calculate the air conditioner tonnage you need from room area and BTU per sq ft. Find the right AC size and cooling capacity in BTU/hr instantly.
  • Speed Conversion Calculator
    Convert speed between m/s, km/h, mph, ft/s and knots instantly. Enter a value, pick the units, and get an accurate conversion with the formula shown.
  • Pressure Conversion Calculator
    Convert pressure between Pascals, kilopascals, bar, psi, atmospheres and mmHg instantly. Free online pressure unit conversion calculator with formulas.
  • Temperature Conversion Calculator
    Convert temperatures between Celsius, Fahrenheit and Kelvin instantly. Enter a value and unit to see all three scales with exact formulas.
  • Troy Weight Conversion Calculator
    Convert troy ounces, pennyweight, grains, and grams instantly. Free troy weight conversion calculator for precious metals like gold and silver.
  • Volume Conversion Calculator
    Convert volume between liters, milliliters, US gallons, quarts, pints, cups, and fluid ounces instantly. Uses US customary units for liquid measures.
  • Weight (Mass) Conversion Calculator
    Convert weight and mass between kilograms, grams, milligrams, pounds, ounces, and metric tons instantly with this free unit conversion calculator.
  • Online Alarm Clock
    Use our free online alarm clock to wake up, stay on schedule, or manage tasks. Set alarms quickly and customize sound and time right in your browser.
  • Counter
    Simple online counter tool. Increase, decrease, or reset numbers instantly. Set custom step values and limits with ease.
  • Stopwatch
    Use this online stopwatch to measure time intervals precisely. Start, stop, and reset with ease.
  • Countdown Timer
    Free online countdown timer. Set hours, minutes, and seconds to count down easily. Simple, fast, and useful for work, study, or daily tasks.

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