Photography and Music Calculators — Depth of Field, Exposure, Crop Factor, BPM, Notes, Intervals and Bitrate

Seven calculators for the numbers behind photography and music production: how much of a scene is in focus, what settings give the same exposure, what a lens becomes on a smaller sensor, how long a beat lasts in milliseconds, what frequency a note is, what interval two notes make, and how much data audio produces. Each shows its working and adds a reference table. Real-time tools such as tuners and metronomes are not included; these are calculators only.

Every Creative Calculators tool

Audio Bitrate Calculator

Sample rate, bit depth and channels to kbps and file size per minute.

BPM to Milliseconds Calculator

Tempo to delay times in ms and Hz for every note value, and back.

Crop Factor Calculator

Equivalent focal length, crop factor and angle of view for any sensor size.

Depth of Field Calculator

Near and far focus limits and hyperfocal distance for any lens and sensor.

Exposure Calculator

EV from aperture, shutter and ISO, with equivalent settings at other f-stops.

Music Interval Calculator

Interval name, semitones, cents and just ratio between any two notes.

Note Frequency Calculator

Note to frequency and frequency to note, with cents offset and MIDI number.

Depth of field and hyperfocal distance

The depth of field calculator takes focal length, aperture, focus distance and sensor format and returns the near and far limits of acceptable sharpness, the total depth, how it splits in front of and behind the subject, and the hyperfocal distance for landscapes. The table shows depth of field across the aperture range so you can see where diffraction and background blur trade off.

Exposure value and equivalent settings

The exposure calculator works out the exposure value of an aperture, shutter speed and ISO, names the kind of scene it matches, and converts the combination to an equivalent exposure at a different aperture or ISO, reporting the change in stops. The table lists the shutter speed needed at every full-stop aperture for the same exposure.

Crop factor and field of view

The crop factor calculator compares any sensor with full frame, gives the full-frame equivalent focal length and aperture, and calculates the horizontal, vertical and diagonal angle of view along with the frame width at a set distance. The table shows what the same lens covers on every common format from medium format to phone sensors.

BPM to milliseconds

The BPM to milliseconds calculator converts a tempo into the length of every note value in milliseconds, with dotted and triplet variants, the matching LFO frequency in hertz and sample counts at 44.1 and 48 kHz, for setting delays, compressor releases and reverb pre-delay in time with a track. Enter a delay time instead and it finds the tempo.

Note frequency

The note frequency calculator converts a note name such as C#3 to its frequency, MIDI number, wavelength and period at any concert pitch, or takes a frequency and identifies the nearest note and how many cents off it sits. The table lists every note in the same octave.

Music intervals

The music interval calculator names the interval between two notes, or transposes a note by a number of semitones, and shows the size in cents under equal temperament next to the just-intonation ratio and how far the two differ. The table lists all thirteen intervals above the starting note.

Audio bitrate and file size

The audio bitrate calculator multiplies sample rate, bit depth and channels into an uncompressed bitrate, gives the data per second, minute and hour and the size of a recording of any length, and shows the Nyquist frequency and dynamic range the settings imply. The table compares common formats from telephone quality to multitrack sessions.