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Quick Reference: Common File Size Conversions
- 1 KB = 1,000 bytes (SI) or 1,024 bytes (binary KiB)
- 1 MB = 1,000,000 bytes (SI) or 1,048,576 bytes (binary MiB)
- 1 GB = 1,000,000,000 bytes (SI) or 1,073,741,824 bytes (binary GiB)
- 1 TB = 1,000 GB (SI) or 1,024 GiB (binary TiB)
- 1 Mbps = 125 KB/s (divide by 8 to convert bits to bytes)
- 1 Gbps = 125 MB/s
The File Size Calculator on TechConverter.me handles all of these calculations instantly, supporting both SI and binary units, transfer time estimates across all common connection types, and storage planning for databases, logs, and cloud infrastructure.
Examples
Example 1: Unit Conversions (SI vs Binary)
Input: 1 GB
SI units (powers of 10):
1 GB = 1,000,000,000 bytes
1 GB = 1,000 MB
1 GB = 1,000,000 KB
Binary units (powers of 2):
1 GiB = 1,073,741,824 bytes
1 GiB = 1,024 MiB
1 GiB = 1,048,576 KiB
Difference: 1 GiB is 7.37% larger than 1 GB
Note: Windows reports disk sizes in GiB but labels them GB,
which is why a "1 TB" drive shows as ~931 GB in Windows Explorer.
Example 2: Transfer Time Estimates
File size: 4.7 GB (Blu-ray ISO)
Transfer times:
USB 2.0 (480 Mbps): 1 min 19 sec
USB 3.0 (5 Gbps): 7.5 seconds
USB 3.1 Gen 2 (10 Gbps): 3.8 seconds
Gigabit Ethernet: 37.6 seconds
10 Gigabit Ethernet: 3.8 seconds
WiFi 5 (300 Mbps): 2 min 6 sec
WiFi 6 (1.2 Gbps): 31 seconds
4G LTE (50 Mbps): 12 min 32 sec
Home broadband (100 Mbps): 6 min 16 sec
Fiber (1 Gbps): 37.6 seconds
Example 3: Image Raw Size Calculation
Camera: 24 megapixel, 24-bit color (8 bits per channel, RGB)
Raw (uncompressed) size:
24,000,000 pixels × 3 bytes/pixel = 72,000,000 bytes = 68.7 MB
JPEG compressed (typical):
Quality 95: ~8-12 MB
Quality 80: ~3-5 MB
Quality 60: ~1.5-2.5 MB
PNG lossless:
~20-30 MB (depends on image complexity)
WebP:
Quality 80: ~2-4 MB (30-40% smaller than JPEG at same quality)