Sort dates and inspect calendar gaps: Validate Gregorian dates, sort them chronologically, preserve duplicates, and report days since the previous sorted date.

Developer & data

Sort JSON object keys

Sort JSON object keys locally in your browser, with clear input requirements, a worked example and an explanation of the result.

Text & writing

Sort lines

Sort lines: Sort lines in Unicode code-unit order; case-sensitive

Math & statistics

Spearman rank correlation with ties

Spearman rank correlation with ties: Rank each series with average ranks for ties, then calculate Pearson correlation between the two rank series.

Unit converters

Speed converter

Speed converter: result = amount × source factor ÷ destination factor. Factors are relative to m/s.

Geometry

Sphere volume

Sphere volume: V = 4πr³ ÷ 3 (m³)

Developer & data

Split a CSV column by a literal delimiter

Split a CSV column by a literal delimiter: Split the selected parsed cell by a literal delimiter.

Money & borrowing

Split shared bills in proportion to income

Split shared bills in proportion to income: Each share = shared bill × individual income / sum of incomes.

Home & construction

Stair riser and run planner

Estimate an equal-riser stair layout from total rise, a chosen maximum riser and horizontal going.

Math & statistics

Standard deviation

Standard deviation: Sum squared deviations from mean ÷ N (population) or N−1 (sample); take square root

Home & construction

Stock length cutting plan

Stock length cutting plan: Expand requested quantities, sort pieces longest first, and place each in the first existing stock that fits.

Digital quantities

Storage converter

Storage converter: result = amount × source factor ÷ destination factor. Factors are relative to byte.

Digital quantities

Streaming internet data usage

Estimate streaming data consumption from an average bitrate, daily usage, days and simultaneous devices.