JSON Lines Size Calculator
Estimate the size of a newline-delimited JSON dataset.
About JSON Lines Size Calculator
JSON Lines trades the enclosing array for one object per line, which makes the file streamable and splittable at any newline. That property is what allows parallel processing without parsing the whole file. Shard sizing matters for distributed processing because each shard becomes one task, and shards that are too large prevent even work distribution.
Formula
JSON Lines Size
Size = lines × (average line bytes + one newline byte)
- JSON Lines
- One JSON object per line, allowing streaming and splitting
- shard
- A file chunk sized for parallel processing
Worked example
With the default values below, JSON Lines Size Calculator returns Total Size of 0.07842. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Number of linesminimum 0
- 200,000
- Average line sizeminimum 0 bytes
- 420 bytes
- Gzip compression savingaccepts 0–100 %
- 80 %
- Target shard sizeminimum 0.001 MB
- 256 MB
Results
- Total Size
- 0.07842 GB
- Compressed Size
- 0.01568 GB
- Shards Required
- 1
- Lines per Shard
- 200,000
- Total Size
- 80.299 MB
Step by step
- 1Values used
- 2JSON Lines Size
- 3Total Size= 0.07842 GB
- 4Compressed Size= 0.01568 GB
- 5Shards Required= 1
- 6Lines per Shard= 200,000
- 7Total Size= 80.299 MB
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 5 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is JSON Lines Size calculated?
Size = lines × (average line bytes + one newline byte) JSON Lines trades the enclosing array for one object per line, which makes the file streamable and splittable at any newline. That property is what allows parallel processing without parsing the whole file.
Why does JSON Lines Size matter?
Shard sizing matters for distributed processing because each shard becomes one task, and shards that are too large prevent even work distribution.
What values do I need to enter?
This calculator takes 4 inputs: Number of lines, Average line size, Gzip compression saving, Target shard size. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.