Home & Life

Hobbies: Photo, Music & Garden Calculators

Photography exposure, music tempo and pitch, gardening and crafts. Free calculators with formulas and worked examples.

Photography

Exposure Value (EV) CalculatorEnter the aperture, shutter speed and ISO of a correct exposure.Depth of Field Calculator (Near, Far, Hyperfocal)Enter the lens focal length, aperture, focus distance and your sensor.Astrophotography Shutter Speed Calculator (500 Rule and NPF Rule)Enter your lens, aperture and camera details.Photo Print Size Calculator (Pixels, DPI and Megapixels)Enter the image's pixel width and height and the print resolution.Crop Factor Calculator (Equivalent Focal Length and Aperture)Enter the lens focal length and aperture and choose the sensor.Field of View Calculator (Angle of View and Scene Width)Choose the sensor and enter the focal length and subject distance.Time-Lapse Calculator (Interval, Frames and Clip Length)Enter how long the event lasts, the shooting interval and the video frame rate.

Music

BPM to Milliseconds Calculator (Delay and Reverb Times)Enter the tempo in beats per minute.Note Frequency Calculator (Pitch to Hz)Choose a note and octave.Song Length Calculator (Bars and BPM to Time)Enter the bars, time signature and tempo.Guitar Fret Spacing CalculatorEnter the scale length and the fret number.

Garden

Plant Spacing Calculator (How Many Plants Fit)Enter the bed size and the spacing between plants (in the same unit).Fertilizer Calculator (NPK: How Much Product to Apply)Enter the bag's N-P-K numbers, the nitrogen rate and the area.Raised Bed Soil Calculator (Cubic Feet, Yards and Bags)Enter the bed's length and width in feet and the soil depth in inches.Lawn Watering Calculator (Sprinkler Run Time)Enter your weekly target, the sprinkler's output and the lawn area.Seed Starting Date Calculator (From Last Frost)Enter your average last frost date and the weeks from the seed packet.

Crafts

Knitting Gauge Calculator (Stitches and Rows to Cast On)Enter your gauge over 10 cm (4 in) and the size you want.Quilt Binding Calculator (Strips and Fabric Needed)Enter the quilt size and your binding strip width.Fabric Yardage Calculator (Pieces from a Bolt)Enter the number of pieces, their size and the fabric width.

3D printing

3D Printing Filament Calculator (Length, Weight and Cost)Enter the filament used (from your slicer), the material and the spool price.

Cycling

Bike Gear Calculator (Gear Inches, Development, Speed)Enter the chainring and sprocket teeth, wheel diameter and cadence.

Astronomy

Telescope Magnification Calculator (FOV, Exit Pupil)Enter the telescope's aperture and focal length and the eyepiece's focal length and apparent field.

Brewing

Homebrew ABV Calculator (Original and Final Gravity)Enter the original gravity before fermentation and the final gravity after.Brix to Specific Gravity Calculator (and Back)Enter a Brix reading or a specific gravity.

About these calculators

Calculators for creative hobbies: photography exposure and depth of field, music tempo, pitch and frequency, gardening plants and soil, and knitting and sewing quantities.

Each calculator explains its formula, includes a worked example and lists its sources. Read how we check them on our editorial policy page, or browse all calculators.

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Please note: TheCalcTools gives general estimates for information and education. It is not financial, medical, legal or tax advice, and results should be checked before you make a decision. See our disclaimer and about page.