Free Online Tools

Calculate percentages easily. Find what percent of a number is.

Calculate exact age from date of birth in years, months, and days.

Calculate Body Mass Index and understand your health status.

Calculate discounts, sale prices, and savings percentage.

Calculate monthly payments, total interest, and amortization for loans.

Calculate tip amount and split bills easily at restaurants.

Full-featured scientific calculator with trigonometric and logarithmic functions.

Calculate the exact difference between two dates in days, weeks, months, years.

Calculate compound interest and future value with regular monthly contributions, compounding frequency options and a full earnings breakdown.

Calculate simple interest, total amount and effective earnings on any principal, rate and time period with a clear step-by-step result summary.

Estimate the future value of a monthly SIP investment with expected annual returns, showing invested amount, gains and wealth created over time.

Calculate monthly mortgage payments, total interest and payoff totals from home price, down payment, interest rate and loan term in seconds.

Convert pay between hourly, weekly, monthly and annual amounts using your hours per week, with a full breakdown of every equivalent salary figure.

Add VAT to a net price or remove VAT from a gross price at any rate, showing the VAT amount and both net and gross totals side by side clearly.

Calculate GST inclusive and exclusive prices at any rate such as 5, 12, 18 or 28 percent, with the exact tax amount shown for invoices and billing.

See what something will cost in the future at a given inflation rate and what future money will be worth in terms of today purchasing power easily.

Project your retirement savings at your planned retirement age from current savings, monthly contributions and expected investment returns easily.

Find the monthly saving needed to reach any financial goal by a target date, accounting for what you have saved already and expected investment growth.

Find how long it takes to pay off a credit card balance with a fixed monthly payment, and exactly how much interest you will pay along the way.

Calculate return on investment as a percentage, total gain or loss, and annualised CAGR for any investment with an optional holding period in years.

Find the break-even point in units and revenue for a product or business from fixed costs, selling price and variable cost per unit in one click.

Calculate profit, gross margin percentage and markup from cost and revenue figures, so you can price products and check business profitability fast.

Work out how much rent you can afford from your monthly income using the 30 percent rule, with checks for existing debts and total housing costs.

Estimate an electricity bill from units used in kWh, the rate per unit, fixed charges and tax, with daily cost and monthly projection breakdowns.

Calculate fuel needed and total trip cost from distance, vehicle efficiency in mpg or litres per 100 km, and the current fuel price per unit volume.

Calculate daily calorie needs with the Mifflin-St Jeor equation, activity multipliers and goal targets for losing, maintaining or gaining weight.

Calculate your recommended daily water intake from body weight, exercise time and climate, shown in litres, millilitres and glasses per day easily.

Estimate body fat percentage with the US Navy tape measure method using neck, waist, hip and height measurements, plus fat mass and lean mass results.

Find your ideal body weight using the Devine and Robinson formulas plus the full healthy BMI weight range for your height, all shown side by side.

Calculate your pregnancy due date from the first day of your last period using Naegele rule, with current gestational age, trimester and key milestones.

Predict your ovulation day, fertile window and next period from your last period date and average cycle length, with dates for the following cycle too.

Calculate running pace per kilometre and mile, speed, and predicted finish times for 5K, 10K, half marathon and marathon from your distance and time.

Add or subtract days, weeks, months or years from any date and see the resulting date, its day of the week, and the total days between the two dates.

Count business days between two dates excluding weekends, see total and weekend days, and find the date a set number of business days from a start date.

Find the ISO week number, day of the year, day of the week and quarter for any date, plus how many days are left in the year after that chosen date.

Count the exact days, weeks and months until a future date or since a past date, perfect for countdowns to birthdays, holidays, deadlines and events.

Calculate the duration between two times of day in hours and minutes, with an option for shifts that cross midnight, plus decimal hours for timesheets.

Calculate the exact hours, minutes and days between two dates and times, ideal for work logs, project billing, rental periods and elapsed time checks.

Calculate your GPA on the 4.0 scale by adding courses with letter grades and credit hours, with total credits, grade points and standing shown instantly.

Calculate your weighted course grade from assignments and exams with their percentage weights, see your letter grade, and find the score you still need.

Add, subtract, multiply or divide two fractions and get the simplified result as a fraction, a mixed number and a decimal, with steps shown clearly.

Simplify any ratio to its lowest terms, see each part as a percentage share, and scale the ratio up or down to match a total amount you specify here.

Calculate the mean, median, mode, range, sum and count of any list of numbers you paste in, separated by commas, spaces or lines, in a single click.

Calculate standard deviation and variance for a data set, with both population and sample versions, plus mean, sum, count and coefficient of variation.

Find the greatest common divisor and least common multiple of two integers instantly, and check whether the numbers are coprime, with method notes.

Check whether any number is prime or composite, find its smallest factor if it is not, and see the nearest prime numbers above and below your number.

Calculate exact factorials up to 1000 using big-integer arithmetic, see the number of digits, and view the full multiplication steps for smaller values.

Raise any base to any power, including negative and fractional exponents, and also see the square, cube, reciprocal and scientific notation of results.

Calculate logarithms to any base plus the common log base 10, natural log, and log base 2 of a number, with a check that the base power returns the value.

Find square roots, cube roots and any nth root of a number, check for perfect squares, simplify square roots into radical form, and square numbers fast.

Calculate the area of eight common shapes including circles, rectangles, triangles, trapezoids, parallelograms, ellipses and sectors with dimensions guide.

Calculate volumes of cubes, cuboids, spheres, cylinders, cones, square pyramids and hemispheres from a few dimensions, with litres conversion included.

From a single radius, calculate the diameter, circumference and area of a circle, plus semicircle values and the volume and surface area of a matching sphere.

Solve triangles two ways: enter three sides for perimeter, Heron area and triangle type, or use Pythagoras mode to find a hypotenuse or a missing leg fast.

Calculate the slope and equation of the line through two points, together with the y-intercept, the distance between the points, midpoint and angle.

Solve any quadratic equation ax² + bx + c = 0 with the quadratic formula, showing the discriminant, both roots (including complex ones), and the vertex.

Add, subtract, multiply or divide binary numbers and see results in binary and decimal, plus convert decimal numbers to binary, octal and hexadecimal.

Convert numbers from 1 to 3999 into Roman numerals and convert Roman numerals back into numbers, with full validation of the numeral you enter easily.

Convert any number up to the billions into English words, including decimals read digit by digit after the point, for cheques, documents and learning.