What Is the Photo File Size Calculator?
The Photo File Size Calculator is a free online tool designed for photographers who need quick, accurate calculations in the photography space. By entering your megapixels, bit depth, file format, you get instant results including size per image, total size, fits on 64gb card. No formulas to memorize, no spreadsheets to build — just enter your numbers and get the answer in seconds. Whether you're a beginner or experienced professional, this calculator saves you time and eliminates guesswork.
Why This Calculation Matters
Getting size per image right can make the difference between success and costly mistakes. In photography, small errors compound quickly. Manual calculations are error-prone and time-consuming, especially under pressure. This calculator applies proven formulas used by photographers worldwide, giving you confidence that your numbers are correct. Use it to capture better images with precision and avoid common pitfalls that trip up beginners.
When Should You Use This Calculator?
This tool is most useful when you know your megapixels and need to find the right size per image. It's also great for quick estimates before committing to a decision, and to double-check manual calculations or professional quotes, and when comparing different scenarios side by side. Bookmark this page and come back whenever you need a fast, reliable answer — the calculator is always free and requires no signup.
Photo File Size Calculator
How to Use This Calculator
- Enter Your Megapixels: Start by entering your megapixels — this is the primary input for the calculation.
- Fill In Additional Details: Complete the remaining fields: bit depth, file format, number of photos. Each value refines the calculation for greater accuracy.
- Click Calculate: Hit the Calculate button to run the numbers. Results appear instantly below.
- Review Your Results: Check your size per image, total size, fits on 64gb card. Use these figures to inform your next decision or compare against alternative scenarios.
How It Works
This photo file size calculator uses established formulas to provide accurate results.
The basic rule:
- RAW (uncompressed) = Megapixels × 10⁶ × Bit Depth × 3 ÷ 8
- RAW (compressed) ≈ Uncompressed × 0.6
- JPEG High ≈ Megapixels × 10⁶ × 0.75 bytes
- TIFF = Megapixels × 10⁶ × Bit Depth × 3 ÷ 8
Results are estimates based on standard formulas. Verify with current local data for your specific situation.
Tips & Considerations
- Double-check your megapixels before calculating — even small input errors can significantly change your results.
- Run the calculator with different values to compare scenarios and find the optimal approach for your situation.
- Pay attention to both size per image and total size — they work together to give you the full picture.
- Bookmark this page for quick access next time you need to capture better images.
- If you're unsure about your number of photos, start with a conservative estimate and adjust from there.
Frequently Asked Questions
How big is a RAW photo file?
RAW file sizes depend on megapixels and bit depth. A 24MP camera at 14-bit produces ~25-30MB RAW files (compressed). A 45MP camera produces ~50-60MB RAW files.
Why are RAW files so much larger than JPEG?
RAW files store all sensor data with minimal compression (12-14 bits per channel). JPEGs use lossy compression and only 8 bits per channel, reducing size by 5-10×.
How many photos fit on a 64GB memory card?
At 24MP: ~2,100 RAW files, ~8,500 high-quality JPEGs. At 45MP: ~1,100 RAW, ~4,500 JPEGs. Shooting RAW+JPEG uses both amounts.
Is the Photo File Size Calculator free to use?
Yes, completely free with no signup required. Use it as many times as you need — there are no limits or hidden fees.
How accurate is this calculator?
This calculator uses standard photography formulas trusted by photographers. Results are reliable estimates for planning purposes. For critical decisions, we recommend consulting a qualified professional to verify.