27 numbers tools
Numbers tools
Practical tools for everyday maths.
Available Numbers tools
Percentage Calculator
Free percentage calculator to solve common percentage questions, including a percentage of an amount, a part of a whole, or change between values.
Age Calculator
Free age calculator to calculate an exact age from a date of birth and a comparison date, shown in years, months, and days.
Discount Calculator
Free discount calculator to calculate a sale price and savings from an original price and a single percentage discount.
Scientific Calculator
Free scientific calculator to evaluate expressions with powers, square roots, and percentages.
GPA Calculator
Calculate a weighted GPA from grade points and course credits.
Final Grade Calculator
Find the final assessment score needed to reach your target grade.
Percentage Change Calculator
Calculate percentage increase, decrease, and absolute difference.
Test Grade Calculator
Convert points earned into a test percentage and letter grade.
Average Calculator
Find the mean, median, minimum, and maximum of a number list.
Fraction Calculator
Add, subtract, multiply, or divide two fractions.
Decimal to Fraction Calculator
Turn a finite decimal into a reduced fraction.
Ratio Calculator
Simplify a ratio and compare its two values.
Standard Deviation Calculator
Calculate the mean, variance, and population or sample standard deviation.
Prime Number Checker
Check whether a whole number is prime.
Scientific Notation Converter
Express a number as a coefficient multiplied by a power of ten.
Right Triangle Solver
Solve a right triangle from any two positive side lengths.
Prime Factorization Calculator
Break a whole number into its prime factors.
GCD & LCM Calculator
Find the greatest common divisor and least common multiple of two integers.
Permutations & Combinations Calculator
Calculate ordered permutations and unordered combinations.
Number to Words Converter
Write a whole number in clear English words.
Weighted Average Calculator
Calculate an average where each value carries a different weight.
Percent Error Calculator
Compare a measured value with an accepted reference.
Statistical Summary Calculator
Find mean, median, mode, and range for a list of numbers.
Quadratic Equation Solver
Solve ax² + bx + c = 0 and identify its roots.
Probability Calculator
Express equally likely outcomes as a fraction, decimal, and percent.
Project Time Estimate Calculator
Estimate a project range from task quantities, durations, and a buffer.
Average Speed Calculator
Calculate average speed, distance, or time from the other two.