**Rounding a number** means giving an approximate value of that number with a certain number of digits after the decimal point.

- A number is said to be rounded up when the approximate value is larger than the number.
- A number is said to be rounded down when the approximate value is smaller than that number.

The calculator can be used to give the whole rounding of a decimal number, or to obtain the rounding of a decimal number with a given number of digits after the decimal point.

round(nombre), where number represents a decimal.

See also

- Pace to speed converter : pace_to_speed. The calculator allows you to convert a pace (time needed to cover 1 kilometer) into speed expressed in km/h.
- Amplitude of a complex number : amplitude. The amplitude calculator determines the amplitude of a complex number from its algebraic form.
- Number of arrangement of a set calculator : arrangement. To calculate online the number of arrangement of p elements of a set of n elements.
- Round a decimal number : round. This calculator allows you to round up or down a decimal number with the desired number of digits after the decimal point.
- Calculation of the monthly payments of the insurance of a credit : loan_insurance. Credit insurance monthly payment calculator: real estate credit, consumer credit, and other types of credit.
- Hours calculator : hours_calculator. Time calculator that allows you to make hourly calculations and time conversions using the h:min:s (hours, minutes, seconds) format.
- Time converter : time_converter. Time calculator that can convert durations into seconds, minutes, hours and days.
- Calculation of binomial coefficients : binomial_coefficient. A binomial coefficient calculator that allows you to calculate a binomial coefficient from two integers.
- To count the number of combinations : combination. To calculate the number of k elements of part of a set of n elements.
- Solving quadratic equation with complex number : complexe_solve. The complex number equation calculator returns the complex values for which the quadratic equation is zero.
- Complex conjugate calculator : complex_conjugate. The online conjugate calculator returns the conjugate of a complex number.
- Base-n converter : base_converter. The calculator allows you to make decimal, binary, hexadecimal conversions, and more generally to any base n between 2 and 36.
- Measurement conversions : convert. The measurement unit calculator allows online conversions volume, surface (area), length.
- Speed conversions : convert_speed. The speed converter allows online conversions to :.kilometers per hour, meters per second, miles per hour, feet per second, knots
- Prime factorization calculator : prime_factorization. The function prime_factorization is used to calculate online the decomposition of an integer into prime factors.
- Quotient and remainder calculator : euclidean_division. The calculator allows to find online the quotient and the remainder in the euclidean division of two polynomials or two integers.
- Parity of a number : is_odd. Is_odd function returns true if the number passed is odd, false otherwise.
- Parity of a number : is_even. Is_even function returns 1 if the number is even, 0 otherwise.
- Factorial calculator : factorial. The factorial of a natural number n is the product of the positive integers less than or equal to n. The factorial calculator allows you to find this number.
- Integer calculations : integer_functions. This calculator allows you to apply special functions to an integer: prime_factorization, base_converter, factorial, percentage, permutation, perimeter, is_even, is_odd.
- Calculation of the monthly payments of a loan : monthly_loan. Loan monthly payment calculator : home loan, consumer loan, and other types of loan.
- Complex modulus calculator : complex_modulus. The modulus calculator allows you to calculate the modulus of a complex number online.
- Complex number calculator : complex_number. The complex number calculator allows to perform calculations with complex numbers (calculations with i).
- Imaginary part of complex number : imaginary_part. The imaginary part calculator allows you to calculate online the imaginary part of a complex number.
- Real part of complex number : real_part. The real part calculator allows you to calculate online the real part of a complex number.
- Permutation calculator : permutation. To calculate online the number of permutation of a set of n elements.
- Gcd calculation online : gcd. GCD calculator that uses Euclid's algorithm to give the steps of the GCD calculation.
- Least common multiple : lcm. LCM calculator to calculate the least common multiple (LCM).
- Pythagorean theorem calculator : pythagorean. The calculator uses the Pythagorean theorem to verify that a triangle is right-angled or to find the length of one side of a right-angled triangle.
- Countdown solver : arithmetic_solver. This countdown solver allows finding a target number from a set of integer in using arithmetic operations.
- Average speed calculator : average_speed. The calculator returns a speed in km/h from a distance and a duration, or from a pace (duration necessary to cover 1 kilometer).
- Speed to pace converter : speed_to_pace. Pace calculator from a speed in km/h, the pace is the time to cover a distance, usually expressed in min/km or min/mile.