Data Storage Converter
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and binary equivalents (KiB, MiB, GiB).
About the Data Storage Converter
Data storage units are increasingly relevant for everyday consumer decisions: choosing between a 128 GB and 256 GB phone, understanding an ISP's 1.5 GB/day data cap, comparing cloud storage tiers, or estimating how many photos will fit on a memory card. The units scale across 15 orders of magnitude from bits to petabytes, and the binary (1,024-based) versus decimal (1,000-based) distinction means a 1 TB hard drive from the manufacturer and 1 TB shown in your operating system represent meaningfully different quantities.
The binary vs decimal ambiguity is a systematic source of consumer confusion. Hard drive manufacturers use decimal: 1 GB = 1,000 MB. Operating systems (Windows, macOS) use binary internally: 1 GiB = 1,024 MiB. A hard drive labelled 1 TB contains 1,000,000,000,000 bytes; Windows reports it as approximately 931 GB because it divides by 1,024 at each step. A 128 GB phone advertised by the manufacturer will show approximately 118-120 GB available to the user before any system software is installed. This is not deception - it is a unit mismatch that the industry has not fully standardized.
In India specifically, mobile data consumption patterns make data unit literacy particularly important. TRAI-reported average data consumption in India grew to over 20 GB per user per month by 2024. Mobile plans are capped in GB. Understanding whether 2 GB/day means enough for 1 hour of YouTube at 1080p (yes) or 2 hours (marginal) requires knowing streaming bitrates and translating them to GB per hour. Similarly, choosing between a 100 GB and 200 GB cloud plan means understanding how much storage your current photos, documents, and videos actually require.
Data Storage Conversion
Decimal (SI): 1 KB = 1,000 B · 1 MB = 1,000 KB · 1 GB = 1,000 MB · Binary (IEC): 1 KiB = 1,024 B · 1 GiB = 1,024 MiB
1 TB drive (manufacturer) = 931 GiB as shown by OS · 128 GB phone = ~118 GiB available · 1 hour HD video = 4-8 GB · 1 hour 4K video = 20-45 GB · 1 Mbps = 0.125 MB/s
Worked Example
40 GB monthly ISP data cap - how many hours of YouTube?
At 720p: ~26 hours/month · At 1080p: ~13 hours/month · At 480p (0.7 GB/hr): ~57 hours/month
Tips & Insights
- 1
A smartphone photo from a 12-16 MP camera is typically 3-6 MB in JPEG and 15-25 MB in RAW. A 128 GB phone holds roughly 20,000-40,000 JPEG photos before subtracting system storage (roughly 12-15 GB) and installed apps.
- 2
Video file sizes: 1 hour of 1080p video at standard bitrate = 4-8 GB. 1 hour of 4K = 20-45 GB. 1 hour of WhatsApp-compressed video = 0.5-1.5 GB. This helps estimate storage needs for trips, events, or content creation projects.
- 3
India's most common mobile plan gives 1.5-2 GB/day. At 1080p YouTube (2-3 GB/hour), you can watch about 45-60 minutes at full quality per day before hitting the cap. Downgrading to 480p (0.5-0.7 GB/hour) extends viewing to about 3 hours per day.
- 4
The binary-decimal distinction matters when buying storage: a 1 TB hard drive contains 931 GiB as shown by Windows/macOS. A 256 GB phone shows approximately 238 GiB available in settings. Use 93% of the marketed decimal capacity as the practical rule of thumb.
- 5
Cloud storage math: Google Photos high-quality photos average about 4 MB each. A 100 GB Google One plan holds approximately 25,000 high-quality photos or 17,000-25,000 original 12 MP photos (4-6 MB each).
- 6
Network speed is measured in megabits per second (Mbps), not megabytes (MB). A 100 Mbps broadband plan downloads at 12.5 MB/s (divide by 8 to convert bits to bytes). Downloading a 1 GB file on a 100 Mbps connection takes about 80 seconds in ideal conditions.
- 7
SSD lifetime is specified in TBW (terabytes written). A 600 TBW SSD tolerates 600,000 GB of writes over its life. At 20 GB/day of writes, this represents 82 years - SSD endurance is rarely a practical concern for most users.
Why this matters for you
With over 750 million smartphone users and some of the world's highest mobile data consumption rates, Indians navigate data storage and usage units constantly. A consumer who does not understand the difference between 128 GB and 256 GB of phone storage, or between a 1.5 GB/day and 50 GB/month plan, cannot make informed purchasing decisions. These are not abstract technical distinctions - they determine whether your phone fills up in 18 months, whether you can stream a series during a train journey, and whether your cloud backup plan is adequate.
For small business owners, content creators, and IT professionals, accurate data storage conversion is operationally important. A video editor working with 4K footage needs to size editing drives correctly (a 10-hour project at 4K may generate 400-500 GB of raw footage). A web developer estimating server storage for a SaaS product needs to understand GB and TB accurately. A small business backing up 2 TB of accounting data needs a backup service plan that actually accommodates 2 TB, not 1.86 TiB as the OS might report.
The rapid growth of AI, large language models, and data-intensive applications is pushing data unit scales upward. Terms like petabyte (1,000 TB) and exabyte (1,000 PB) that once belonged only to hyperscale cloud providers are increasingly appearing in product specifications and regulatory discussions. Building a habit of accurate unit conversion across all scales - from bytes to petabytes - prepares anyone working in tech, data science, or digital content for the numerical literacy that these fields require.
Related Calculators
Frequently Asked Questions
What is the difference between GB and GiB?+
GB (gigabyte) uses SI decimal: 1 GB = 1,000,000,000 bytes. GiB (gibibyte) uses binary: 1 GiB = 1,073,741,824 bytes (2³⁰). Hard drives are marketed in GB (decimal) but Windows shows GiB, making drives appear smaller than advertised.
How many MB in a GB?+
1 GB = 1,000 MB (decimal/SI standard). 1 GiB = 1,024 MiB (binary standard). For file sizes on most modern operating systems, 1 GB = 1,000 MB is the common convention.
What is a petabyte?+
1 petabyte (PB) = 1,000 terabytes = 1,000,000 gigabytes = 1,000,000,000 megabytes. The entire US Library of Congress is estimated at 10–15 terabytes. Major cloud providers store exabytes (1,000 PB) of data.
How many songs/photos fit in a GB?+
Approximately 250 MP3 songs (4MB each), 500 compressed photos (2MB each), or 2–4 hours of HD video per GB. RAW photos from DSLRs are 20–40MB each, so ~25–50 per GB.
Why do hard drives show less space than advertised?+
Hard drive manufacturers use SI units (1 GB = 1,000 MB = 1,000,000,000 bytes) while operating systems use binary units (1 GiB = 1,024 MiB = 1,073,741,824 bytes). A 1 TB hard drive contains 1,000,000,000,000 bytes according to the manufacturer. Windows and Linux report this as 931 GiB. This 7% discrepancy grows with drive size: a 2 TB drive shows as 1.82 TiB. SSDs, USB drives, and memory cards have the same issue. Only RAM is always sold and measured in binary units (1 GB RAM = exactly 1,073,741,824 bytes). The SI vs binary confusion is why IEC introduced the kibibyte and mebibyte notation in 1998.
How much storage do I need for common Indian use cases?+
Storage needs by Indian use case: Smartphone photos (typical Indian family): a 12 MP photo is approximately 3 to 4 MB compressed JPEG; 1,000 family photos take 3 to 4 GB. WhatsApp media (very common in India): text messages are tiny, but received photos and videos accumulate - a WhatsApp-heavy user accumulates 5 to 20 GB per year. UPI and banking apps: minimal storage, under 1 GB total. Video calls and streaming: Netflix HD streams at 3 GB per hour; YouTube in 1080p uses 1.5 to 2 GB per hour. CBSE and UPSC study materials (PDFs, scanned books): 10 to 50 GB for extensive material. Bollywood movies (full HD): 2 to 4 GB each. For a typical middle-class Indian smartphone user, 64 GB fills up in 1 to 2 years, 128 GB lasts 3 to 4 years, and 256 GB is comfortable for power users or those who shoot lots of videos.
What is cloud storage and how do I estimate how much I need?+
Cloud storage services (Google Drive, iCloud, OneDrive, Dropbox) store your data on remote servers accessible from any device. Indian usage context: Google gives 15 GB free shared between Gmail, Google Drive, and Google Photos (full-resolution photos from 2021 onward count toward this limit). Apple gives 5 GB free with iCloud. For Indian families with 2 to 3 smartphones and a WhatsApp-heavy lifestyle, 15 GB fills within 1 to 2 years, requiring paid plans. Google One 100 GB plan costs approximately Rs. 130 per month; 200 GB costs Rs. 210 per month. For reference: 1 GB holds approximately 250 to 300 high-quality photos, 30 minutes of 1080p video, or 1,000 PDF pages. Paid cloud storage is the most cost-effective way to never lose photos - at Rs. 130 per month, 100 GB backup costs Rs. 1,560 per year, far less than losing irreplaceable family photos.