A little help for
students.
Less busywork. More room to learn. Your collection is a starting point; all tools remain available.
Weighted grade calculator
Calculate a grade from assessment scores and weights.
GPA calculator
Calculate credit-weighted grade points on a supplied scale.
Final exam score needed
Find the final exam score needed to reach your target.
Fraction simplifier
Reduce an integer fraction using the greatest common divisor.
Quadratic equation solver
Find real or complex roots of ax² + bx + c = 0.
Standard deviation calculator
Show sample and population standard deviation.
Circle arc length
Find arc length and sector area from radius and a central angle.
Ring area calculator
Find material area between concentric circles.
Ellipse area calculator
Find ellipse area from its major and minor full axis lengths.
Trapezoid area calculator
Find area between parallel sides with a perpendicular height.
Triangle area from three sides
Find triangle area using Heron’s formula after checking the triangle inequality.
Sphere volume and surface
Find volume and surface area of a sphere from its radius.
Collapse extra spaces
Collapse runs of horizontal whitespace while retaining line breaks.
Normalize line endings
Convert CRLF and standalone CR line endings into LF.
Remove line breaks
Join nonempty lines with one space.
Remove zero-width characters
Remove U+200B, U+200C, U+200D and U+FEFF characters.
Normalize smart quotes
Replace curly single and double quotes with plain ASCII quotes.
Remove repeated blank lines
Keep at most one blank line between text blocks.
Merge PDF
Combine several PDF documents in your selected order.
Extract PDF pages
Create a document from only the pages you choose.
Split PDF
Download a ZIP containing one PDF for every page.
Delete PDF pages
Remove selected pages from a copy of a PDF.
Rotate PDF
Rotate all pages by a right angle.
Reorder PDF pages
Arrange selected pages in the exact order you need.
Word counter
Count words, lines and Unicode characters.
Character counter
Count code points, graphemes and UTF-8 bytes.
Reading time
Estimate reading time from your word count.
Uppercase converter
Convert text to uppercase.
Percentage calculator
Find a percentage of a number.
Percentage change
Compare a new value with an original nonzero value.
Percentage difference
Compare two nonnegative values using their average.
Discount calculator
Find the final price and saving after a percentage discount.
Date difference calculator
Find the whole-day difference between two calendar dates.
Add days to date
Add or subtract a whole number of calendar days.
Age calculator
Calculate calendar age on a date you choose.
ISO week number
Find the ISO week and ISO week-numbering year.