Data & Format Calculators — JSON Size, SQL Cost, Compression | CalcEngine
Free data and format calculators for developers. Measure JSON payload size, SQL query cost, index size, compression ratios, and pagination performance.
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JSON Size
Instantly calculate the byte size and KB of any JSON string. Validates syntax in real time. Essential for API payload optimization and size limit checks.
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SQL Query Cost
Estimate SQL query costs on BigQuery, Athena, or Redshift Spectrum. Enter data scanned and query volume to instantly project your monthly database spend.
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Pagination Perf
Calculate pagination performance for offset vs cursor-based queries. Enter total records, page size, and page number to see query time slowdown instantly.
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Index Size
Index size calculator: instantly estimate how large a B-tree database index will grow given row count, key size, page size, and fill factor — no DBA needed.
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Compression Ratio
Calculate compression ratio instantly — enter original and compressed file sizes to get the ratio, space savings percentage, and bytes saved. Works for any format