Math calculators

Which calculator do you need?

• “What is 15% of 80?” or “what percent is 12 of 48?” — the percentage calculator handles these and percentage change.
• Adding or simplifying fractions — the fraction calculator shows the common denominator and simplification steps.
• Scaling a recipe or a screen size — the ratio calculator solves for the missing value.
• Summarizing a list of numbers — the average calculator gives mean, median and mode; the standard deviation calculator adds variance, quartiles and the spread of the data.
• Grades — the GPA calculator averages grade points by credits; the final grade calculator tells you the score you need on the final.
• Anything else — the scientific calculator handles powers, roots, logarithms and trigonometry; the random number generator draws fair numbers from any range.

Precision and rounding

Calculations keep full precision internally and round only for display. Where exact answers matter — fractions, for example — results are kept exact rather than converted to decimals.