A megapixel (MP) equals 1 million pixels. 1920x1080 is about 2.07 MP, 4K UHD (3840x2160) is about 8.29 MP, and a 24 MP camera shoots roughly 6000x4000.

Megapixel Calculator (Pixels ↔ MP)

Q: How do I convert pixels to megapixels?

Multiply width by height, then divide by 1,000,000. Example: 4000 x 3000 = 12,000,000 pixels = 12 MP.

Q: How do I convert megapixels to pixels?

Multiply megapixels by 1,000,000 for the total pixel count. To split into width x height, pick an aspect ratio and solve W = sqrt(total * rw / rh), H = sqrt(total * rh / rw).

Q: How many megapixels is 4K?

4K UHD (3840x2160) is about 8.29 megapixels. DCI 4K (4096x2160) is about 8.85 MP.

Q: How many megapixels is 1080p?

1080p (Full HD, 1920x1080) is approximately 2.07 megapixels.

Q: Why does aspect ratio matter when converting MP back to pixels?

Same megapixel count can split into different width x height depending on aspect ratio. 12 MP at 4:3 is 4000x3000; the same 12 MP at 16:9 is about 4618x2598.

Convert between total pixel count and megapixels (MP), and go back from megapixels to a width × height resolution at any aspect ratio (16:9, 4:3, 3:2, 1:1). 1 MP = 1,000,000 pixels.

Width × Height → Megapixels

Width (px)

Height (px)

Megapixels → Width × Height

Megapixels (MP)

Aspect Ratio

Results are provided for reference only and may differ from actual values.

Megapixel Reference Table

Resolution	Total Pixels	Megapixels	Aspect Ratio
1280×720 (HD)	921,600	0.92 MP	16:9
1920×1080 (Full HD)	2,073,600	2.07 MP	16:9
2560×1440 (QHD)	3,686,400	3.69 MP	16:9
3840×2160 (4K UHD)	8,294,400	8.29 MP	16:9
4000×3000	12,000,000	12 MP	4:3
6000×4000	24,000,000	24 MP	3:2
1080×1080	1,166,400	1.17 MP	1:1

Practical Guide — Cameras, Video, and Storage

Is more megapixels always better?

Not really. Beyond a certain point, extra megapixels don't translate to visibly sharper images because lens quality, sensor size, and pixel pitch matter more. A 12 MP full-frame sensor typically outperforms a 48 MP phone sensor in low light because each pixel is physically larger and captures more light. Practical rule: 12–24 MP is plenty for 99% of uses (web, social media, A4 prints, 4K cropping). Beyond 40 MP is only useful for commercial photographers, large prints (A1+), or aggressive cropping.

Megapixels needed for common outputs

Instagram, Facebook post: 1–2 MP (1080×1080 = 1.17 MP)
1080p video frame: 2.07 MP
4K UHD video frame: 8.29 MP
A4 photo print @ 300 DPI: 8.7 MP
A3 poster @ 300 DPI: 17.4 MP
Billboard @ 30 DPI viewed from 30 ft: 3–5 MP per square meter

Phone "108 MP" vs "12 MP" — What's actually happening?

High-megapixel phones usually shoot in pixel binning mode: four (or nine) physical pixels are combined into one "super pixel" for better low-light performance, reducing the effective output resolution. A 108 MP phone typically saves 12 or 27 MP JPEGs by default. The full 108 MP is only usable in "high resolution" mode, requires excellent light, and produces huge files (~25 MB each).

Storage planning — how many photos fit?

Approximate file sizes for JPEG at high quality:

12 MP photo: 3–5 MB → ~200–330 photos per GB
24 MP photo: 6–10 MB → ~100–170 per GB
48 MP photo: 15–25 MB → ~40–65 per GB
RAW file (any MP): 2–3× the JPEG size, compressed losslessly

A 128 GB phone can hold roughly 25,000 phone photos, 12,000 DSLR photos, or about 6 hours of 4K video.

Converting MP back to pixels — how aspect ratio changes the answer

"I want a 10 MP image" — but what shape? The calculator gives different widths and heights depending on the aspect ratio you pick:

10 MP at 4:3 → 3651×2738 (close to 3648×2736, a common DSLR size)
10 MP at 3:2 → 3873×2582
10 MP at 16:9 → 4217×2372
10 MP at 1:1 → 3162×3162

When downsampling for web use, pick the aspect ratio of your target platform first, then the pixel count — not the other way around.

Frequently Asked Questions

Q. What is a megapixel?

A megapixel (MP) equals 1 million pixels. 1920×1080 is about 2.07 MP; 4K UHD (3840×2160) is about 8.29 MP; a 24 MP DSLR shoots roughly 6000×4000.

Q. How do I convert pixels to megapixels?

Multiply width × height, then divide by 1,000,000. Example: 4000 × 3000 = 12,000,000 pixels = 12 MP.

Q. How do I convert megapixels to pixels?

Multiply megapixels by 1,000,000 to get total pixel count. To split into width × height, pick an aspect ratio: W = √(total × r_w / r_h), H = √(total × r_h / r_w).

Q. How many megapixels is 4K?

4K UHD (3840×2160) is about 8.29 megapixels. DCI 4K (4096×2160) is about 8.85 MP.

Q. How many megapixels is 1080p?

1080p (Full HD, 1920×1080) is approximately 2.07 megapixels.

Q. Why does aspect ratio matter when converting MP back to pixels?

The same megapixel count can be split into different width × height combinations depending on the aspect ratio. 12 MP at 4:3 is 4000×3000; the same 12 MP at 16:9 is about 4618×2598.

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Disclaimer
Results are provided for reference only and may differ from actual values. This tool is for informational purposes and should not be used as a basis for legal, financial, or medical decisions.