How to use the Basic Calculator
Learn the keypad, keyboard shortcuts, percent button, copy result action, and calculation history using the Access Free Tools calculator.
Read guideUtility Guides
Real guides for tools that are available on Access Free Tools.
Showing 40 guides.
How to use the Percentage Calculator
Learn how to find percent of a number, what percent one number is of another, percentage change, discounts, markups, and reverse percentages.
Read guideHow to use the Ratio Calculator
Learn how to simplify ratios, make equivalent ratios, split totals by ratio parts, handle decimals, and check proportions.
Read guideHow to use the Percent Error Calculator
Learn how to compare measured and accepted values, calculate percent error, read signed percent error, and avoid common lab-report mistakes.
Read guideHow to use the Half-Life Calculator
Learn how to calculate remaining amount, elapsed time, and half-life with decay formulas, matching units, examples, and privacy notes.
Read guideHow to use the Exponent Calculator
Learn how to calculate powers, negative exponents, zero exponents, fraction exponents, scientific notation, and common exponent mistakes.
Read guideHow to use the Log Calculator
Learn how to calculate logarithms with custom bases, use ln and log10, read change-of-base steps, and check answers with exponents.
Read guideHow to use the Root Calculator
Learn how to calculate square roots, cube roots, nth roots, exponent form, negative radicands, and real-number root checks.
Read guideHow to use the Quadratic Formula Calculator
Learn how to solve ax^2 + bx + c = 0, read the discriminant, find real or complex roots, and use vertex details.
Read guideHow to use the Binary Calculator
Learn how to add, subtract, multiply, divide, and convert binary numbers with base-2 place values, decimal checks, and remainders.
Read guideHow to use the Hex Calculator
Learn how to add, subtract, multiply, divide, and convert hexadecimal numbers with base-16 digits, decimal checks, binary output, and remainders.
Read guideHow to use the Kawaii Calculator
Learn when to use the cute pastel calculator, how its buttons and shortcuts work, and how to keep recent calculations private in the browser.
Read guideHow to use the Scientific Calculator
Learn DEG/RAD mode, typed expressions, trig functions, logs, roots, powers, constants, history, and when this tool is useful.
Read guideHow to use the Fraction Calculator
Learn how to add, subtract, multiply, divide, simplify, and convert fractions and mixed numbers with the Fraction Calculator.
Read guideLCM Calculator Guide
Learn how to find the least common multiple of two or more whole numbers, read the steps, and use LCM for fractions and schedules.
Read guideGCF Calculator Guide
Learn how to find the greatest common factor, compare GCF with LCM, simplify fractions, and read exact integer steps.
Read guideHow to use the Factor Calculator
Learn how to list factors, factor pairs, prime factors, and prime factorization for positive whole numbers.
Read guideHow to use the Rounding Calculator
Learn how to round by decimal places, significant figures, and place value using nearest, up, down, and truncate methods.
Read guideHow to use the Matrix Calculator
Learn how to add, subtract, multiply, transpose, and find determinants for 2x2 and 3x3 matrices.
Read guideHow to use the Scientific Notation Calculator
Learn how to convert standard numbers to scientific notation and convert coefficient-times-power-of-10 form back to standard form.
Read guideHow to use the Big Number Calculator
Learn how to add, subtract, multiply, and divide very large whole numbers exactly with quotient and remainder output.
Read guideHow to use the Standard Deviation Calculator
Learn how to calculate sample or population standard deviation, variance, mean, range, and formula steps from a data set.
Read guideHow to use the Number Sequence Calculator
Learn how to generate arithmetic, geometric, and Fibonacci sequences, find the rule, and copy the next terms.
Read guideHow to use the Sample Size Calculator
Learn how confidence level, margin of error, population proportion, and finite population size affect survey sample size.
Read guideHow to use the Probability Calculator
Learn how to calculate P(A and B), P(A or B), complements, independent-event intersections, and probability steps.
Read guideHow to use the Statistics Calculator
Learn how to get mean, median, mode, range, quartiles, variance, and standard deviation from one list of values.
Read guideHow to use the Mean, Median, Mode, Range Calculator
Learn how to find the main measures of center and spread: mean, median, mode, and range.
Read guideHow to use the Permutation and Combination Calculator
Learn when to use nPr or nCr, how order changes counting, and how exact integer answers are calculated.
Read guideHow to use the Z-score Calculator
Learn how to standardize a value, read above-or-below-average direction, and estimate a normal percentile.
Read guideHow to use the Confidence Interval Calculator
Learn how to calculate z confidence intervals for a mean or proportion with margin of error and clear formula steps.
Read guideHow to use the Triangle Calculator
Learn how to calculate triangle area, perimeter, angles, and triangle type from three side lengths.
Read guideHow to use the Volume Calculator
Learn how to calculate volume for rectangular prisms, cubes, cylinders, spheres, and cones with cubic units.
Read guideHow to use the Slope Calculator
Learn how to find slope from two points, read rise over run, identify vertical lines, and use line equations.
Read guideHow to use the Area Calculator
Learn how to calculate area for rectangles, triangles, circles, trapezoids, and parallelograms.
Read guideHow to use the Distance Calculator
Learn how to calculate distance between two points, delta x, delta y, and midpoint from coordinates.
Read guideHow to use the Circle Calculator
Learn how to find radius, diameter, circumference, and area from one known circle measurement.
Read guideHow to use the Surface Area Calculator
Learn how to calculate surface area for rectangular prisms, cubes, cylinders, spheres, and cones.
Read guideHow to use the Pythagorean Theorem Calculator
Learn how to solve a missing right-triangle side with a^2 + b^2 = c^2.
Read guideHow to use the Right Triangle Calculator
Learn how to solve right triangle sides, area, perimeter, and acute angles from two known sides.
Read guideHow to use the Random Number Generator
Learn how to pick one random number, generate lists, use unique results, exclude numbers, sort results, copy answers, and understand everyday-use limits.
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