Math
Significant figures, scientific notation, dimensional analysis, and printable graph paper.
This section covers the quantitative housekeeping that every science and statistics problem depends on: counting significant figures correctly, converting to and from scientific notation, and carrying units through a calculation so a dimensional mistake shows up before the answer does. The same care extends to the everyday conversions that trip people up: moving a pressure across eleven units at once on exact NIST factors, reducing a ratio to lowest terms with the GCD shown, or spelling a number into words with its short-scale and hyphenation rules stated up front rather than assumed. It also produces printable graph paper and practice worksheets when you need to work a problem on paper. Every conversion shows the exact factor and rule it used, so the arithmetic underneath a science or statistics problem holds up to inspection.
All Math instruments
Pressure Unit Converter
Convert a pressure across eleven units at once, with exact NIST factors.
Ratio Simplifier: Reduce Any Ratio to Lowest Terms
Reduce any ratio to lowest terms by GCD, including three-term ratios, decimals, fractions, negatives, and terms in different units.
Sig Fig Calculator
Count and round significant figures from the typed number, including decimal zeros, exact numbers, and scientific notation.
Scientific Notation Converter
Convert decimal, scientific, and E notation while preserving reported trailing zeros and showing engineering notation.
Dimensional Analysis Calculator
Convert units with a factor-label trace, exact conversion-factor notes, and dimension mismatch checks.
Graph Paper
Generate printable square, dot, and isometric graph paper with physical spacing and calibration bars.
Math Drill Worksheets
Generate reproducible printable arithmetic drill worksheets with answer keys, seeds, and print calibration.
Number to Words Converter: Spell Out Any Number in English
Spell any number out in English words with short scale, hyphenation, American or British "and", decimals, negatives, ordinals, and US check writing named on the page. Reverse parser included.