Size calculator library
Electronics Size Calculators
Size screens, power, storage, cables and computer hardware from the measurements and specifications that matter.
Electronics rarely have one useful size number. These tools cover physical fit, viewing distance, power, storage, cable length, coverage and component clearance so you can narrow down what will work before you buy.
Popular calculators
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What TV Size Do I Need for My Viewing Distance
Find recommended tv diagonal from viewing distance and target horizontal field of view.
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What Monitor Size Do I Need for My Desk
Find monitor size for desk from eye-to-screen distance, target horizontal field of view, and available desk width.
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What Projector Screen Size Do I Need
Enter viewing distance, target horizontal field of view, and aspect ratio width to work out projector screen size.
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What Power Bank Size Do I Need
Enter device battery energy wh, desired full recharges, and conversion efficiency to work out power-bank minimum energy.
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What Router Coverage Do I Need
Calculate router coverage requirement using area to cover, number of floors, and layout/wall difficulty factor.
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What PC Case Size Do I Need
Calculate pc case compatibility using motherboard width, motherboard height, and gpu length.
All Electronics calculators
Screens & Displays
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What Mesh Wi-Fi System Size Do I Need
Use your measurements for home floor area, floors, and rated area per node to find mesh wi-fi node count.
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What VESA Mount Size Do I Need
Use your measurements for tv vesa hole spacing width, tv vesa hole spacing height, and mount maximum vesa width to find required vesa pattern.
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What TV Mount Size Do I Need
Enter tv weight, tv diagonal, and mount maximum rated load to work out tv mount compatibility.
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What Photography Backdrop Size Do I Need
Enter group width, backdrop margin each side, and tallest subject height to work out photography backdrop size.
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What TV Antenna Range Do I Need
Use your measurements for straight-line transmitter distance, terrain/building range margin, and indoor-placement penalty factor to find minimum antenna range rating.
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What Laptop Storage Size Do I Need
Use your measurements for os and applications storage, documents/data, and photos/video/media to find laptop storage capacity.
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What Surge Protector Size Do I Need
Find surge protector outlet count and load from number of plugs, combined connected watts, and desired spare outlets.
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What Monitor Size Do I Need for My Desk
Find monitor size for desk from eye-to-screen distance, target horizontal field of view, and available desk width.
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What Desktop Power Supply Size Do I Need
Find recommended psu wattage from cpu peak package power, gpu peak board power, and other component load.
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What Phone Screen Size Suits My Hand
Calculate phone screen size for hand using comfortable one-hand span, maximum phone-width-to-hand-span ratio, and phone aspect width.
Audio, Power & Charging
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What Tablet Size Do I Need
Find maximum tablet screen size from maximum comfortable device width, maximum comfortable device height, and tablet aspect width.
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What Wi-Fi Extender Coverage Do I Need
Enter dead-zone area, extender rated area, and wall/interference loss factor to work out wi-fi extender coverage.
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What Extension Cable Length Do I Need
Use your measurements for outlet-to-device route, extra slack, and additional route around obstacles to find extension cable length.
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What Laptop Screen Size Fits My Bag
Use your measurements for bag internal width, bag internal height, and estimated chassis allowance around screen to find maximum laptop screen for bag.
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What Radiator Size Fits My PC Case
Find minimum radiator section count from cpu heat load watts, gpu heat load watts, and radiator rated dissipation per 120mm section.
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What Power Bank Size Do I Need
Enter device battery energy wh, desired full recharges, and conversion efficiency to work out power-bank minimum energy.
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What External SSD Size Do I Need
Calculate external ssd capacity using data to store, expected extra data, and desired free-space fraction.
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What HDMI Cable Length Do I Need
Calculate hdmi cable length using horizontal route length, vertical route length, and extra service loop.
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What Portable Projector Brightness Do I Need
Calculate required projector lumens using screen width, screen height, and target screen luminance ft-l.
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What NAS Storage Size Do I Need
Find nas raw storage requirement from current data size, annual data growth, and planning horizon years.
Cables, Wi-Fi & Storage
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What E-Reader Screen Size Do I Need
Enter preferred readable text column width, screen aspect width, and screen aspect height to work out e-reader screen size.
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What Soundbar Size Do I Need for My TV
Find soundbar maximum width from tv physical width, maximum soundbar-to-tv width ratio, and available stand width.
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What Projector Throw Distance Do I Need
Use your measurements for screen image width, projector minimum throw ratio, and projector maximum throw ratio to find projector throw-distance range.
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What Desk Cable Tray Size Do I Need
Use number of cables, average cable diameter, largest power brick width to find desk cable-tray minimum internal size.
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What Projector Screen Size Do I Need
Enter viewing distance, target horizontal field of view, and aspect ratio width to work out projector screen size.
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What Subwoofer Size Do I Need for My Room
Use room length, room width, room height to find subwoofer capacity guide.
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What Amplifier Power Do I Need for My Speakers
Use speaker sensitivity db, listening distance, target spl to find amplifier power requirement.
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What AV Receiver Power Do I Need
Use speaker sensitivity db, listening distance, target peak spl to find av receiver power requirement.
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What CPU Cooler Height Fits My Case
Enter cpu cooler total height, case maximum cooler height, and desired extra allowance to work out cpu cooler height clearance.
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What Charger Wattage Do I Need
Use your measurements for device maximum charging power, number of devices, and combined power for other devices to find recommended charger wattage.
PC Components & Camera Setup
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What Webcam Field of View Do I Need
Enter width of scene or people to frame, camera-to-subject distance, and extra width margin each side to work out required webcam horizontal fov.
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What Mouse Pad Size Do I Need
Calculate mouse pad size using required mouse movement width, required mouse movement depth, and keyboard width if using desk mat.
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What Router Coverage Do I Need
Calculate router coverage requirement using area to cover, number of floors, and layout/wall difficulty factor.
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What GPU Length Fits My PC Case
Use your measurements for gpu length, case maximum gpu length, and front radiator/fan intrusion to find gpu length clearance.
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What PC Case Size Do I Need
Calculate pc case compatibility using motherboard width, motherboard height, and gpu length.
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What Memory Card Size Do I Need
Enter recording bitrate, recording duration hours, and capacity reserve to work out memory-card capacity.
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What Tripod Height Do I Need
Find tripod working height from user eye height, camera viewfinder offset above tripod plate, and tripod head height.
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What TV Size Fits My Wall
Calculate maximum tv diagonal for wall using usable wall width, usable wall height, and side margin each side.
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What Keyboard Size Fits My Desk
Find maximum keyboard width from usable desk width, space reserved for mouse, and other equipment width.
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What UPS Size Do I Need for My Computer
Calculate minimum ups va and battery energy using connected load watts, ups power factor, and capacity headroom.
Photography & Desk Accessories
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What Dual Monitor Size Fits My Desk
Calculate dual-monitor fit using each monitor diagonal, aspect ratio width, and aspect ratio height.
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What TV Size Do I Need for My Viewing Distance
Find recommended tv diagonal from viewing distance and target horizontal field of view.
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What Smartwatch Case Size Suits My Wrist
Use your measurements for top-of-wrist flat width, maximum case-width-to-wrist ratio, and lug overhang allowance to find maximum smartwatch case and lug-to-lug size.
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What Solar Generator Size Do I Need for Electronics
Use continuous device load, required runtime hours, highest startup/peak load to find solar generator energy and inverter requirement.
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What Speaker Size Do I Need for My Room
Calculate speaker power requirement using listening distance, target listening spl, and speaker sensitivity db @1w/1m.
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What Ring Light Size Do I Need
Calculate ring light diameter using subject width, light-to-subject distance, and desired apparent light diameter.
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What Ultrawide Monitor Size Fits My Desk
Enter ultrawide diagonal, aspect width, and aspect height to work out ultrawide monitor desk fit.
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What USB-C Cable Wattage Do I Need
Find minimum usb-c cable rating from charger output watts and device input watts.
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What Ethernet Cable Length Do I Need
Enter measured cable route, service loop at first end, and service loop at second end to work out ethernet cable length.
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What Camera Lens Focal Length Do I Need Indoors
Use your measurements for camera sensor width, scene width to capture, and camera-to-subject distance to find estimated focal length.
Measure first
For compatibility-sensitive products, use the exact dimensions and ratings from the manufacturer. A calculated target is a screening tool; ports, standards, mounting patterns and model-specific limits still need to match.