Logo

MonoCalc

/

Image Resolution Converter

Converter

Load a resolution preset:

File Size Estimate Options

Results

3000 × 2000 px at 300 DPI

10.00 × 6.67 inches

Print Ready
Width (in)10.00"
Height (in)6.67"
Width (cm)25.40 cm
Height (cm)16.93 cm
Width (mm)254.00 mm
Height (mm)169.33 mm
Megapixels6.00 MP
Aspect Ratio3:2
Est. File Size (TIFF)17.2 MB

Standard professional print quality (300+ DPI).

DPI Quality Reference

DPI RangeRatingUse Case
600+ExcellentFine-art prints, high-end photography, museum quality
300–599Print ReadyMagazines, photo prints, brochures, standard print
200–299AcceptablePosters, large-format prints viewed at distance
150–199Low QualityLow-quality print, visible pixelation at close range
72–149Web OnlyScreen display only, not suitable for print

About This Tool

Image Resolution Converter – DPI, PPI, and Print Size Calculator

Understanding image resolution is essential for photographers, graphic designers, and print professionals. The Image Resolution Converter helps you answer the most common resolution questions: Will my photo print sharp at this size? How many pixels do I need for a high-quality poster? What is the effective DPI of this image when printed at a specific dimension? This tool handles all three scenarios and shows you megapixels, aspect ratio, and estimated file size alongside every result.

What Is DPI and Why Does It Matter for Print?

DPI (dots per inch) measures how many ink dots a printer places per inch of output. In the context of preparing digital images for print, DPI is used interchangeably with PPI (pixels per inch) — the number of image pixels mapped to each inch of the printed page.

The relationship is straightforward: a 3000-pixel-wide image printed at 300 DPI produces a 10-inch-wide print. The same image printed at 150 DPI produces a 20-inch print, but with visibly lower quality. The formula is:

Print size (inches) = Pixel dimension ÷ DPI

For professional print work, 300 DPI is the standard minimum. Most photo labs, magazines, and commercial print services require at least 300 DPI for acceptable quality. Fine-art prints and high-end photography may request 600 DPI or higher.

Three Calculation Modes

Pixels to Print Size

Enter your image's pixel dimensions and the intended DPI to calculate the maximum physical print size. A 4000 × 3000 pixel image at 300 DPI prints at 13.3 × 10 inches. The tool also shows the dimensions in centimeters and millimeters, making it useful for international print formats like A4 and A3.

Print Size to Required Pixels

Enter the physical print dimensions and your target DPI to find the minimum pixel dimensions your image must have. For an 8 × 10 inch print at 300 DPI, you need at least 2400 × 3000 pixels — about 7.2 megapixels. A 24 × 36 inch poster at 300 DPI requires 7200 × 10800 pixels, or approximately 77.8 megapixels. Use the built-in print size presets (4×6 Photo, A4, US Letter, etc.) to skip manual entry.

Calculate Effective DPI

Have an image and a known print width? Enter both to find the effective DPI. For example, a 1920-pixel-wide image printed at 6.4 inches gives exactly 300 DPI. If the calculated DPI falls below 300, the tool flags it with a quality warning and suggests using a higher-resolution image or reducing the print size.

Megapixels and Aspect Ratio

Every result includes the total megapixel count (width × height ÷ 1,000,000) and the simplified aspect ratio calculated using the greatest common divisor. A 1920 × 1080 image simplifies to a 16:9 ratio; a 3000 × 2000 image gives 3:2, the classic 35mm film ratio. Knowing your aspect ratio helps you avoid unexpected cropping when printing to standard paper sizes.

Estimated File Size

The tool estimates storage requirements based on pixel dimensions, color mode, and file format:

  • TIFF — reports uncompressed raw size (width × height × bytes per channel)
  • PNG — estimates approximately 50% of raw (lossless compression)
  • JPEG — estimates approximately 10% of raw (lossy compression at typical quality)

Bytes per pixel depend on the color mode: RGB uses 3 bytes, CMYK uses 4 bytes (common in professional print workflows), and Grayscale uses 1 byte. These are estimates — actual file sizes vary based on image content and compression settings.

Common Print Size Reference

The table below shows the minimum pixel dimensions needed for common print sizes at 300 DPI, which is the standard for professional photographic and commercial print quality:

  • 4×6 in — 1200 × 1800 px (2.2 MP)
  • 5×7 in — 1500 × 2100 px (3.2 MP)
  • 8×10 in — 2400 × 3000 px (7.2 MP)
  • A4 (8.27×11.69 in) — 2481 × 3507 px (8.7 MP)
  • 11×14 in — 3300 × 4200 px (13.9 MP)
  • 16×20 in — 4800 × 6000 px (28.8 MP)
  • 24×36 in poster — 7200 × 10800 px (77.8 MP)

Tips for Photographers and Designers

Always check resolution before sending files to a print lab. Most consumer cameras (12–48 MP) produce more than enough resolution for standard photo prints but may fall short for very large-format posters. For scanning physical photos, use at least 600 DPI to capture fine detail. When designing graphics for print, work in CMYK color mode to avoid unexpected color shifts during the printing process.

Frequently Asked Questions

Is the Image Resolution Converter free?

Yes, Image Resolution Converter is totally free :)

Can I use the Image Resolution Converter offline?

Yes, you can install the webapp as PWA.

Is it safe to use Image Resolution Converter?

Yes, any data related to Image Resolution Converter only stored in your browser (if storage required). You can simply clear browser cache to clear all the stored data. We do not store any data on server.

How does the Image Resolution Converter work?

The tool operates in three modes. 'Pixels to Print Size' calculates the physical dimensions an image produces at a given DPI. 'Print Size to Required Pixels' finds the pixel dimensions needed to print at a target size and quality. 'Effective DPI' computes the actual DPI when a known pixel image is printed at a specified size. All modes also show megapixels, aspect ratio, and an estimated file size.

What DPI is required for professional print quality?

300 DPI is the standard minimum for professional print output such as photo prints, brochures, and magazines. 150–200 DPI is acceptable for posters and large-format prints viewed at a distance. Anything below 150 DPI typically shows visible pixelation when printed. For screen display, 72–96 PPI is standard and no higher resolution is needed.

What is the difference between DPI and PPI?

PPI (pixels per inch) refers to the density of pixels in a digital image or on a screen. DPI (dots per inch) refers to the density of ink dots placed by a printer. In the context of preparing images for print, these terms are used interchangeably because the image's PPI directly determines how many printer dots per inch the output will have at a given print size.

How is estimated file size calculated?

The tool estimates uncompressed file size as: width × height × bytes-per-pixel (3 for RGB, 4 for CMYK, 1 for Grayscale). For TIFF it reports the raw size. For PNG it applies a ~50% compression estimate (lossless). For JPEG it applies a ~10% estimate (lossy at typical quality settings). Actual file sizes vary depending on image content and compression settings.

How many megapixels do I need to print an A4 photo at 300 DPI?

An A4 sheet is 8.27 × 11.69 inches. At 300 DPI you need 2481 × 3508 pixels, which is approximately 8.7 megapixels. Most modern smartphones with 12 MP or more cameras easily meet this requirement. For a 16×20 inch print at 300 DPI you would need 4800 × 6000 pixels, or roughly 28.8 megapixels.

What does the aspect ratio lock do?

When aspect ratio lock is enabled, changing one pixel dimension (width or height) automatically recalculates the other to preserve the original proportions. For example, if your image is 1920×1080 (16:9) and you change the width to 1280, the height is automatically set to 720. This prevents distortion when resizing images.