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Free tools · VIDEO SIZES
Find the width or height for any ratio — 16:9, 9:16, 1:1, 4:5 — or the ratio of any size.
1920 × 1080 keeps 16:9 — YouTube videos, widescreen.
Common 16:9 sizes: 1280 × 720, 1920 × 1080, 2560 × 1440, 3840 × 2160
1080 × 1350 is 4:5.
This aspect ratio calculator finds the missing number. Choose a ratio and type a width, and it gives the height that keeps the shape — or type a height and it gives the width. Enter any width and height together and it tells you their ratio, simplified.
It covers the shapes video creators use every day: 16:9 for YouTube videos, 9:16 for Shorts, Reels and TikTok, 1:1 and 4:5 for feed posts, plus 4:3 and 21:9. It runs in your browser; nothing is sent anywhere.
● HOW IT WORKS
Choose a ratio — 16:9, 9:16, 1:1, 4:5 — or type your own.
Type a width or a height; the other one fills in.
Or enter any width and height to find their ratio.
Free, with no sign-up. It runs in your browser; nothing you paste or upload is sent to VidMyth or stored. Next: Make a 16:9 or 9:16 video.
16:9 is widescreen: the shape of a YouTube video, a TV and most monitors, with common sizes of 1280 × 720, 1920 × 1080 and 3840 × 2160. 9:16 is the same shape turned upright — the full-screen vertical frame of YouTube Shorts, Instagram Reels and TikTok, usually 1080 × 1920.
1:1 is square, 4:5 is the taller portrait shape many feeds favour, 4:3 is the older TV and slide shape, and 21:9 is cinematic widescreen. A video changes ratio only by cropping or adding bars, so pick the ratio for the platform before you make anything.
To find the height for a ratio, multiply the width by the ratio's second number and divide by the first: a 1920-pixel-wide 16:9 frame is 1920 × 9 ÷ 16 = 1080 pixels tall. To find a ratio from a size, divide both numbers by their greatest common divisor: 1920 and 1080 share 120, which leaves 16 and 9.
Some sizes don't reduce to small whole numbers — 2.39:1 cinema or an odd crop — so the calculator shows those as a decimal ratio instead.
Changing a video or an image from one ratio to another always means giving something up. You can crop — keep the centre and lose the edges — or fit with bars — keep everything and fill the leftover space. What you should never do is stretch: scaling the width and the height by different amounts distorts every face and circle in the frame.
When you plan for more than one platform, frame the important part of each shot in the middle, where a 16:9 frame and a 9:16 crop overlap. Text placed near the edges of a widescreen frame is the first thing a vertical crop loses.
If you make the same idea for YouTube and for Shorts, you need it in 16:9 and in 9:16. VidMyth renders a script as a long-form 16:9 video or a 9:16 Short — not a crop of one into the other, but each scene drawn for its frame. See how long Shorts can be and the templates that come in both shapes.
● QUESTIONS
9:16 is a vertical frame, nine units wide for every sixteen tall — the full-screen shape of YouTube Shorts, Instagram Reels and TikTok. The standard size is 1080 × 1920 pixels.
Common 16:9 sizes are 1280 × 720 (720p), 1920 × 1080 (1080p), 2560 × 1440 and 3840 × 2160 (4K). Any width works: multiply it by 9 and divide by 16 for the height.
Divide the width and the height by their greatest common divisor. 1920 × 1080 divides by 120 into 16:9; 1080 × 1350 divides by 270 into 4:5. The calculator does it for any size.
Yes. 1080 ÷ 120 = 9 and 1920 ÷ 120 = 16, so 1080 × 1920 is exactly 9:16 — the standard vertical video size.
16:9 for a video and 9:16 for a Short. YouTube recommends 3840 × 2160 for video thumbnails; see the thumbnail size guide.
● KEEP GOING
A YouTube Short can be up to 3 minutes long.
Each template is a complete look for a video: how the scenes are drawn, how they move, how the text appears.
Resize any image to a YouTube thumbnail — 16:9 or 9:16, under the size limit — in your browser.
Paste a YouTube link and save its thumbnail in every size YouTube keeps.
Paste a script and see how long it runs when read aloud — and whether it fits a Short.