Aspect Ratio & Size Calculator

Get the exact crop box and center offsets for any aspect ratio in seconds — then crop a real photo to match and export it.

Get the exact crop size for any aspect ratio in seconds. Enter a width and a height, pick a ratio, and AspectCrop returns the precise crop box, center offsets, and scaled sizes — no math, no eyeballing, no guesswork.

Most resizing tools just squish an image to fit. AspectCrop works out the real center-crop box first — the exact pixels kept and trimmed — so you know precisely what the result will look like before you commit to it.

WHAT YOU GET

• The exact crop box in pixels for any ratio, plus center offsets so you know exactly what gets trimmed
• Every standard ratio one tap away: 16:9, 4:5, 1:1, 9:16, 3:2, A-series paper, golden ratio and more
• Fit and fill sizes scaled to 1080 px, so an image sits perfectly inside any frame
• Crop a real photo to any ratio and export the finished image to your camera roll or share sheet
• A saved history that keeps every size you have worked out within reach
• A reference cheat sheet showing which ratio each platform expects

PERFECT FOR

• Photographers matching prints, cameras, and darkroom paper sizes
• Video editors and creators sizing reels, stories, and YouTube
• Graphic designers laying out on golden ratio and A-series pages
• Social media managers hitting every platform's exact dimensions

WHY NOT JUST DRAG A CROP BY HAND Dragging a crop box in the Photos app guesses the ratio and quietly loses pixels you can never get back. AspectCrop gives you the exact box and offsets first, so the crop is right the first time — every time.

PRIVACY Everything runs on your device. No accounts, no ads, no tracking, ever.

FULL ACCESS Premium unlocks cropping and exporting real photos, your saved history, and every preset. Choose a weekly or yearly subscription, or unlock everything forever with a one-time lifetime purchase.

Download AspectCrop and nail every aspect ratio the first time.

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