Free online calculators — age, BMI, loan, GST, percentage, date and hundreds more.
Calculate percentages, changes and differences instantly.
Calculate exact age in years, months, weeks and days.
Find the exact difference between any two dates.
Convert times between any time zones worldwide.
Calculate exact chronological age with decimal output.
Add and subtract time durations in hours and minutes.
Calculate Body Mass Index and healthy weight range.
Convert binary numbers to decimal format instantly.
Convert decimal numbers to binary format instantly.
Convert any number into written word form.
Convert between hundreds of measurement units instantly.
Perform advanced scientific and trigonometric calculations.
Calculate area for any geometric shape or room.
Calculate volume for any 3D shape or container.
Solve speed, distance and time problems instantly.
Calculate fuel cost for any journey or trip.
Convert hexadecimal numbers to decimal format.
Convert octal numbers to decimal format instantly.
Convert numbers to and from Roman numerals.
Add, subtract, multiply and divide fractions instantly.
Simplify ratios and solve ratio proportion problems.
Calculate square roots and nth roots of any number.
Raise any number to any power instantly.
Calculate logarithms in any base instantly.
Check if any number is prime instantly.
Find the greatest common divisor and least common multiple.
Generate Fibonacci sequence numbers up to any length.
Perform matrix addition, multiplication and determinant calculations.
Solve quadratic equations and find real or complex roots.
Solve any triangle given sides and angles.
Calculate circle area, circumference, radius and diameter.
Calculate mean, median, mode and range for any dataset.
Calculate standard deviation and variance for any dataset.
Calculate probability for events and combinations.
Calculate concrete volume in cubic yards and bags.
Calculate subnet masks, ranges and hosts for any CIDR.
Calculate voltage drop across any electrical circuit.
Calculate BTU requirements for any room or space.
Calculate square footage for any shape or floor plan.
Calculate total hours and pay from time card entries.
Calculate compatibility percentage between two names.
Calculate GDP using expenditure and income approaches.
Calculate fuel efficiency and miles per gallon.
Convert between horsepower, kilowatts and torque.
Calculate stair rise, run and stringer length.
Calculate resistor values from colour band codes.
Solve voltage, current and resistance using Ohm's Law.
Calculate electricity consumption and cost for appliances.
Convert shoe sizes between US, UK and EU standards.
Calculate distance, fuel usage and mileage for trips.
Calculate density from mass and volume measurements.
Calculate mass from density and volume measurements.
Convert weight between kilograms, pounds and other units.
Calculate speed from distance and time values.
Calculate solution molarity from moles and volume.
Calculate molecular weight of any chemical formula.
Calculate your official golf handicap index.
Compare tire sizes and calculate diameter and width.
Calculate roof area, shingles and material quantities.
Calculate tiles needed for any floor or wall area.
Calculate mulch volume needed for any garden bed.
Calculate gravel quantity in cubic yards and tonnes.
Calculate apparent wind chill temperature for any conditions.
Calculate apparent temperature combining heat and humidity.
Calculate dew point from temperature and humidity.
Calculate network bandwidth and data transfer times.
Add and subtract time durations in any format.
Count days between today and any future or past date.
Find what day of the week any date falls on.
Identify and extend any arithmetic or geometric sequence.
Calculate percent error between measured and true values.
Calculate radioactive decay and half-life calculations.
Calculate slope, gradient and angle of inclination.
Calculate required sample size for any survey or study.
Calculate Z-scores and standard normal distribution values.
Calculate confidence intervals for any population estimate.
Calculate distance between two geographic coordinates.
Calculate surface area of any 3D geometric shape.
Solve right triangles using the Pythagorean theorem.
Calculate sides, angles and area of any right triangle.
Calculate square roots, cube roots and nth roots.
Find the least common multiple of any numbers.
Find the greatest common factor of any numbers.
Find all factors and prime factors of any number.
Round numbers to any decimal place or significant figure.
Convert numbers to and from scientific notation.
Perform calculations with very large numbers precisely.
Find the prime factorisation of any whole number.
Find all common factors shared between numbers.
Perform long division with step-by-step working shown.
Calculate the mean average of any set of numbers.
Calculate P-values for hypothesis testing in statistics.
Calculate permutations and combinations for any values.
Perform arithmetic calculations in binary number system.
Perform arithmetic calculations in hexadecimal number system.
Calculate daily calorie needs based on weight and activity.
Calculate pregnancy due date from last menstrual period.