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Free online rounding & precision calculators. Fast, accurate, and always free to use.
Use our free round number calculator to round any number to a specified number of decimal places. Supports 6 rounding methods: half-up (standard), half-down, half-even (banker's rounding), ceiling, floor, and truncate, with a full comparison of all methods.
Use our free ceiling calculator to round any number up (toward positive infinity) to a specified number of decimal places. Shows the original, the ceiling value, the difference, and whether the value changed.
Use our free floor calculator to round any number down (toward negative infinity) to a specified number of decimal places. Shows the original, the floor value, the difference, and whether the value changed.
Use our free truncate calculator to cut off a number at a specified number of decimal places without any rounding. Shows the truncated result, the discarded portion, and comparisons with floor and ceiling.
Use our free significant figures calculator to round any number to a given number of significant figures (1-15). Shows the rounded result, the original digit count, and the rounding magnitude (power of 10).
Use our free precision calculator to display a number with a specified number of decimal places. Includes full error analysis: absolute error, relative error, unit in the last place (ULP), and the error interval [x - ULP/2, x + ULP/2].
Addition, subtraction, multiplication, and division calculators.
Simplify, compare, and calculate with fractions.
Decimal conversion, rounding, and arithmetic calculators.
Calculate powers, square roots, and nth roots.
Solve equations, inequalities, and algebraic expressions.
Area, volume, perimeter, and shape calculators.
Sine, cosine, tangent, and trigonometric functions.
Mean, median, mode, standard deviation, and more.
Prime numbers, factorization, factors, multiples, and LCM calculators.
Binary, decimal, and hexadecimal converters and arithmetic.
Arithmetic and geometric sequences and series.
Matrix operations, determinants, and inverses.
Derivatives, integrals, and limits calculators.
Complex number arithmetic and conversions.
Vector operations, eigenvalues, and linear systems.
Odd math tools and general-purpose calculators.