▣ Calculators
Age, BMI, percentage, and everyday math tools.
◒ Add or Subtract Days from a Date
Add or subtract days, weeks, months, or years from any date and see the exact resulting date.
▣ CALCULATORS Featured◔ Age Calculator
Exact age in years, months, and days from any birth date.
▣ CALCULATORS New◕ Age in Days Calculator
Count exactly how many days, weeks, hours and minutes you have been alive.
▣ CALCULATORS◨ Area Calculator
Calculate the area and perimeter of rectangles, squares, circles, triangles, and trapezoids.
▣ CALCULATORS◧ Aspect Ratio Calculator
Work out image and video aspect ratios and resize dimensions without distortion.
▣ CALCULATORS◧ Average Calculator
Calculate mean, median, mode, range, and standard deviation from any list of numbers.
▣ CALCULATORS Featured◑ BMI Calculator
Body Mass Index with category and healthy weight range.
▣ CALCULATORS◓ Business Days Calculator
Count working days between two dates, skipping weekends, and see total days and weeks.
▣ CALCULATORS◧ Circle Calculator
Enter a radius, diameter, circumference, or area and get every other circle measurement instantly.
▣ CALCULATORS◔ Concrete Calculator
Estimate concrete volume in cubic metres, cubic yards and bags for a slab or footing.
▣ CALCULATORS◫ Date Difference Calculator
Count the days, weeks, months, and working days between any two dates.
▣ CALCULATORS◪ Discount Calculator
Calculate the sale price and money saved from any percentage discount, including stacked offers.
▣ CALCULATORS◑ Electricity Cost Calculator
Work out what any appliance costs to run per day, month and year from its wattage.
▣ CALCULATORS◨ Exponent Calculator
Raise any number to any power, including negative and fractional exponents, and see the result instantly.
▣ CALCULATORS◪ Factorial Calculator
Compute the factorial of any whole number up to 170, with exact results for small values.
▣ CALCULATORS◔ Final Grade Calculator
The score you need on the final exam to hit your target grade.
▣ CALCULATORS◒ Fraction Calculator
Add, subtract, multiply, and divide fractions, simplified.
▣ CALCULATORS◐ GCD and LCM Calculator
Find the greatest common divisor and least common multiple of two or three numbers in one step.
▣ CALCULATORS◓ GPA Calculator
Weighted grade point average from your courses and credits.
▣ CALCULATORS◩ Logarithm Calculator
Calculate log base 10, natural log, log base 2, or a log with any custom base for any positive number.
▣ CALCULATORS◔ Mean Median Mode Calculator
Get the mean, median, mode, and range of any list of numbers with one paste.
▣ CALCULATORS◒ Paint Calculator
Estimate how many litres of paint a room needs from its dimensions and coat count.
▣ CALCULATORS◒ Percent Error Calculator
Compare a measured value with the true value and get percent error, absolute error, and relative error.
▣ CALCULATORS◕ Percentage Calculator
Find a percentage, a percent share, or percent change.
▣ CALCULATORS◈ Permutation and Combination Calculator
Calculate nPr permutations and nCr combinations for any n and r, with factorial detail.
▣ CALCULATORS◫ Prime Number Checker
Check whether any number is prime, see its factors, and find the next prime above it.
▣ CALCULATORS◕ Probability Calculator
Work out single-event probability, the odds against, and the chance of an event happening across repeated trials.
▣ CALCULATORS◐ Proportion Calculator
Solve a/b = c/d for any missing value using cross multiplication.
▣ CALCULATORS◪ Pythagorean Theorem Calculator
Find the missing side of a right triangle from any two known sides using a² + b² = c².
▣ CALCULATORS◑ Quadratic Equation Solver
Solve any quadratic equation ax² + bx + c = 0 and see both roots, the discriminant, and the vertex.
▣ CALCULATORS◪ Random Number Generator
Generate random numbers in any range, with or without duplicates, using secure randomness.
▣ CALCULATORS◫ Ratio Calculator
Simplify ratios, solve for a missing value, and scale ratios to any total.
▣ CALCULATORS▣ Ratio Simplifier
Simplify any ratio to its lowest terms, scale it up, and convert it to a fraction, decimal, and percentage.
▣ CALCULATORS◨ Reading Time Calculator
Estimate how long an article takes to read or speak from its word count.
▣ CALCULATORS◧ Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers, from 1 to 3999.
▣ CALCULATORS▥ Rounding Calculator
Round any number to decimal places, significant figures, or the nearest ten, hundred, or thousand.
▣ CALCULATORS▤ Scientific Notation Converter
Convert numbers to and from scientific notation, engineering notation, and plain decimal form.
▣ CALCULATORS◫ Slope Calculator
Find the slope, angle, distance, and line equation between two points on a graph.
▣ CALCULATORS◧ Square Root Calculator
Find the square root, cube root, or any nth root of a number instantly, with exact and rounded output.
▣ CALCULATORS◓ Standard Deviation Calculator
Paste a list of numbers to get standard deviation, variance, mean, and the full five-number summary.
▣ CALCULATORS◓ Tile Calculator
Calculate how many floor or wall tiles you need, including a cutting waste allowance.
▣ CALCULATORS New◔ Time Card Calculator
Add up worked hours from clock-in and clock-out times, minus breaks, with weekly pay.
▣ CALCULATORS◑ Time Duration Calculator
Work out the exact duration between two times, in hours, minutes, and decimal hours.
▣ CALCULATORS◧ Tip Calculator
Work out the tip, total bill, and per-person split for any restaurant or service bill.
▣ CALCULATORS▦ Triangle Calculator
Find the area, perimeter, and height of a triangle from three sides or from a base and height.
▣ CALCULATORS◐ Unit Converter
Length, mass, volume, area, speed, time, and temperature units.
▣ CALCULATORS◐ Unit Price Calculator
Compare two package sizes by price per unit to find the genuinely cheaper option.
▣ CALCULATORS◩ Volume Calculator
Find the volume of a box, cylinder, sphere, cone, or pyramid from simple measurements.
▣ CALCULATORS◔ Week Number Calculator
Find the ISO week number for any date, plus the day of the year and the quarter.