Math Calculators
Solve common numerical problems with focused tools for percentages, ratios, powers, logarithms and trigonometry. Each published calculator exposes its formula and assumptions so you can understand how the result is produced.
39 certified calculators in this category. Published tools use deterministic calculation logic and expose their formulas, assumptions and methodology.
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Percentage of a Value Calculator
Find a percentage of any number instantly.
Open calculator →CertifiedPercentage Change Calculator
Measure the percentage increase or decrease between two values.
Open calculator →CertifiedPercentage Increase Calculator
Increase a value by a chosen percentage.
Open calculator →CertifiedPercentage Decrease Calculator
Decrease a value by a chosen percentage.
Open calculator →CertifiedPercent Error Calculator
Calculate absolute percent error relative to a non-zero accepted value.
Open calculator →CertifiedRatio Calculator
Compare two quantities as a numeric ratio.
Open calculator →CertifiedProportion Calculator
Convert a two-number proportion into its decimal value.
Open calculator →CertifiedSquare Calculator
Square any real number.
Open calculator →CertifiedCube Calculator
Cube any real number.
Open calculator →CertifiedSquare Root Calculator
Find the principal square root of a non-negative number.
Open calculator →CertifiedCube Root Calculator
Find the real cube root of a number.
Open calculator →CertifiedExponent Calculator
Evaluate a base raised to a chosen exponent.
Open calculator →CertifiedLogarithm Calculator
Calculate a logarithm for a positive value and positive base other than one.
Open calculator →CertifiedScientific Notation Calculator
Evaluate a number written as a coefficient times a power of ten.
Open calculator →CertifiedRounding Calculator
Round a number to a chosen non-negative number of decimal places.
Open calculator →CertifiedReciprocal Calculator
Find the multiplicative inverse of a non-zero number.
Open calculator →CertifiedRemainder Calculator
Find the remainder after division.
Open calculator →CertifiedFraction to Decimal Calculator
Convert a fraction to its decimal value.
Open calculator →CertifiedFraction Calculator
Evaluate a fraction as a numeric value.
Open calculator →CertifiedDecimal to Fraction Calculator
Convert a finite decimal to a reduced fraction.
Open calculator →CertifiedFactor Calculator
Find the smallest non-trivial factor of an integer from 2 to 1,000,000,000.
Open calculator →CertifiedLCM Calculator
Find the least common multiple of two positive integers.
Open calculator →CertifiedGCF Calculator
Find the greatest common factor of two positive integers.
Open calculator →CertifiedDegrees to Radians Calculator
Convert an angle from degrees to radians.
Open calculator →CertifiedRadians to Degrees Calculator
Convert an angle from radians to degrees.
Open calculator →CertifiedSine Calculator
Find the sine of an angle entered in degrees.
Open calculator →CertifiedCosine Calculator
Find the cosine of an angle entered in degrees.
Open calculator →CertifiedTangent Calculator
Find the tangent of an angle entered in degrees.
Open calculator →CertifiedNatural Log Calculator
Calculate the natural logarithm of a positive number.
Open calculator →CertifiedBase 10 Log Calculator
Calculate the base-10 logarithm of a positive number.
Open calculator →CertifiedExponential e^x Calculator
Calculate e raised to a real-number exponent.
Open calculator →CertifiedGrowth Factor Calculator
Calculate the multiplicative growth factor between two values.
Open calculator →CertifiedLinear Midpoint Calculator
Find the halfway interpolated value between two endpoints.
Open calculator →CertifiedQuadratic Discriminant Calculator
Calculate the discriminant of a quadratic when b and the product a×c are known.
Open calculator →CertifiedDirect Variation Calculator
Calculate y for a direct variation.
Open calculator →CertifiedInverse Variation Calculator
Calculate y for an inverse variation.
Open calculator →CertifiedSimple Interest Index Calculator
Calculate simple interest earned for one period before any financial/tax assumptions.
Open calculator →CertifiedDoubling Growth Calculator
Calculate a value after a chosen number of doublings.
Open calculator →CertifiedPower of Ten Scale Calculator
Scale a coefficient by a power of ten.
Open calculator →Calculation guidance
Choose the calculator that matches the operation you need. Keep units consistent where a formula uses measured quantities, and review the formula section on the calculator page when precision or interpretation matters.
How CalcuMint publishes calculators
Public calculators in this directory must pass the certified-content publication gate. Individual calculator pages show the formula, worked examples, assumptions, methodology and source information so results can be reviewed instead of treated as a black box.
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