Hobbies & tech calculators

Photography, electronics, radio, 3D printing, aquariums, music and astronomy. 26 calculators.

• 3D print cost calculatorFull cost and price of a 3D print.
• 3D printing filament calculatorFilament grams ↔ meters and the cost of a print.
• 555 timer calculatorFrequency and duty cycle of a 555 astable.
• Antenna length calculatorDipole and quarter-wave antenna lengths.
• Aquarium dosing calculatorScale a product dose to your tank.
• Aquarium volume calculatorGallons, liters and water weight of a fish tank.
• Belt length calculatorBelt length and speed ratio for two pulleys.
• Bike gear calculatorGear inches and speed for a chainring and cog.
• BPM to milliseconds calculatorNote lengths in ms for a tempo.
• Cutting speed calculatorSpindle RPM from tool diameter and surface speed.
• Decibel calculatordB ↔ ratios and dBm ↔ watts.
• Depth of field calculatorDepth of field and hyperfocal distance.
• Exposure value calculatorExposure value and equivalent settings.
• Field of view calculatorAngle of view, coverage and crop-factor equivalent.
• Gear ratio calculatorGear ratio, output speed and torque.
• Golf handicap calculatorHandicap Index from your last 20 rounds (WHS).
• LED resistor calculatorSeries resistor value and wattage for LEDs.
• ND filter calculatorLong-exposure shutter speed with an ND filter.
• Note frequency calculatorFrequency of any note in equal temperament.
• Print size calculatorPrint size from pixels and DPI, and the reverse.
• RC time constant calculatorRC time constant, charge times and cutoff frequency.
• Series and parallel resistor calculatorTotal of resistors in series or parallel.
• SWR calculatorSWR and losses from forward and reflected power.
• Telescope magnification calculatorTelescope magnification, field and exit pupil.
• Time-lapse calculatorTime-lapse interval, photos and clip length.
• Voltage divider calculatorVoltage divider output, or resistor for a target.