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Percentage of a Value CalculatorFind a percentage of any number instantly.Unit Conversion CalculatorConvert miles to kilometres and common length, mass, volume and temperature units.Percentage Change CalculatorMeasure the percentage increase or decrease between two values.Ratio CalculatorCompare two quantities as a numeric ratio.Proportion CalculatorConvert a two-number proportion into its decimal value.Average CalculatorFind the arithmetic mean of two values.Weighted Average CalculatorCalculate a simple 1:2 weighted mean of two values.Square CalculatorSquare any real number.Cube CalculatorCube any real number.Square Root CalculatorFind the principal square root of a non-negative number.Cube Root CalculatorFind the real cube root of a number.Power CalculatorRaise a base number to a chosen power.Reciprocal CalculatorFind the multiplicative inverse of a non-zero number.Remainder CalculatorFind the remainder after division.Hypotenuse CalculatorFind the hypotenuse of a right triangle from its two perpendicular sides.Rectangle Area CalculatorCalculate the area of a rectangle.Rectangle Perimeter CalculatorCalculate the perimeter of a rectangle.Square Area CalculatorCalculate the area of a square.Square Perimeter CalculatorCalculate the perimeter of a square.Triangle Area CalculatorCalculate triangle area from base and perpendicular height.Circle Area CalculatorCalculate the area enclosed by a circle.Circle Circumference CalculatorCalculate the circumference of a circle.Circle Diameter CalculatorFind a circle diameter from its radius.Parallelogram Area CalculatorCalculate parallelogram area.Trapezoid Area CalculatorCompare the mean width of two parallel sides per unit height.Sphere Volume CalculatorCalculate the volume of a sphere.Sphere Surface Area CalculatorCalculate the surface area of a sphere.Cylinder Volume CalculatorCalculate cylinder volume.Cone Volume CalculatorCalculate cone volume.Rectangular Prism Volume CalculatorFind rectangular-prism volume per unit height.Degrees to Radians CalculatorConvert an angle from degrees to radians.Radians to Degrees CalculatorConvert an angle from radians to degrees.Sine CalculatorFind the sine of an angle entered in degrees.Cosine CalculatorFind the cosine of an angle entered in degrees.Tangent CalculatorFind the tangent of an angle entered in degrees.Natural Log CalculatorCalculate the natural logarithm of a positive number.Base 10 Log CalculatorCalculate the base-10 logarithm of a positive number.Exponential e^x CalculatorCalculate e raised to a real-number exponent.Speed CalculatorCalculate average speed from distance and elapsed time.Distance CalculatorCalculate distance from constant average speed and time.Travel Time CalculatorCalculate travel time from distance and constant average speed.Density CalculatorCalculate density from mass and volume.Pressure CalculatorCalculate pressure from normal force and area.Work CalculatorCalculate mechanical work for force aligned with displacement.Power CalculatorCalculate average power from work and time.Momentum CalculatorCalculate linear momentum.Kinetic Energy CalculatorCalculate translational kinetic energy.Gravitational Potential Energy CalculatorEstimate near-Earth gravitational potential energy using standard gravity.Ohm's Law Voltage CalculatorCalculate voltage from current and resistance.Ohm's Law Current CalculatorCalculate current from voltage and resistance.Electrical Power CalculatorCalculate DC electrical power from voltage and current.Frequency to Period CalculatorCalculate elapsed period for a number of cycles at constant frequency.Wave Speed CalculatorCalculate wave speed from frequency and wavelength.Molarity CalculatorCalculate molar concentration.Dilution Final Concentration CalculatorCalculate final concentration from initial concentration and the initial-to-final volume ratio.Fuel Economy Distance CalculatorEstimate travel distance from fuel amount and distance-per-unit efficiency.Fuel Cost CalculatorEstimate fuel purchase cost.Unit Price CalculatorFind cost per unit.Cost Per Person CalculatorSplit a total cost evenly across people.Tip Amount CalculatorCalculate a tip from bill amount and percentage.Bill With Tip CalculatorCalculate a bill total after adding a percentage tip.Discount Amount CalculatorCalculate the monetary amount of a percentage discount.Sale Price CalculatorCalculate price after a percentage discount.Markup Price CalculatorCalculate selling price from cost and markup percentage.Margin Amount CalculatorCalculate gross amount remaining after direct cost.Profit Margin CalculatorCalculate simple gross profit margin percentage.Pace CalculatorCalculate average time per unit distance.Productivity Rate CalculatorCalculate average output per unit time.Data Rate CalculatorCalculate average data transferred per unit time.Aspect Ratio CalculatorCalculate the numeric width-to-height aspect ratio.Pixels Per Inch CalculatorCalculate pixel density along one dimension.Storage Per File CalculatorCalculate average storage used per file.Paint Quantity CalculatorEstimate paint units required before waste/coats adjustments.Tile Count CalculatorEstimate the theoretical number of tiles before waste allowance.Concrete Volume CalculatorCalculate rectangular concrete volume.Flow Rate CalculatorCalculate average volumetric flow rate.Acceleration CalculatorCalculate average acceleration from velocity change and time.Force CalculatorCalculate net force from mass and acceleration.Impulse CalculatorCalculate impulse from average force and time interval.Torque CalculatorCalculate torque when force is perpendicular to the lever arm.Heat Energy CalculatorCalculate normalized sensible heat for unit specific heat capacity.Ideal Gas Pressure Index CalculatorCompare ideal-gas pressure tendency for fixed amount of gas.Resistance Geometry Index CalculatorCalculate the geometry factor used in resistance calculations.Spring Energy CalculatorCalculate elastic potential energy for an ideal linear spring.Centripetal Acceleration CalculatorCalculate centripetal acceleration for circular motion.Angular Speed CalculatorCalculate average angular speed.Mechanical Advantage CalculatorCalculate idealized force mechanical advantage.Efficiency CalculatorCalculate efficiency as a percentage.Map Scale Distance CalculatorConvert map distance to real-world distance using a scale factor.Recipe Scale CalculatorScale an ingredient quantity up or down.Servings Scale CalculatorScale a recipe quantity by a serving ratio.Download Time CalculatorEstimate ideal transfer time from data size and transfer rate.Battery Runtime Index CalculatorEstimate idealized runtime from capacity and load in compatible units.Energy Cost CalculatorCalculate energy cost from consumption and unit tariff.Water Usage CalculatorEstimate water use from constant flow rate and duration.Occupancy Density CalculatorCalculate people per unit area.Cost Per Square Unit CalculatorCalculate cost per unit area.Coverage Rate CalculatorCalculate the percentage of a total that is covered.Completion Rate CalculatorCalculate completion percentage.Error Rate CalculatorCalculate errors as a percentage of observations.Success Rate CalculatorCalculate successes as a percentage of attempts.Relative Difference CalculatorCompare two values using symmetric relative difference.Range CalculatorFind the span between a minimum and maximum value.Midrange CalculatorFind the midpoint between minimum and maximum values.Z-Score CalculatorCalculate deviation from a mean in unit-standard-deviation terms.Coefficient of Variation CalculatorCalculate relative variability as a percentage.Probability to Odds CalculatorConvert a percentage probability below 100% to decimal odds-against denominator ratio.Probability Complement CalculatorFind the complementary probability percentage.Two-Outcome Expected Value CalculatorCalculate the contribution of one outcome to an expected value.Sample Proportion CalculatorCalculate a sample proportion.Rate Per Thousand CalculatorExpress an event rate per 1,000 observations.Rate Per Million CalculatorExpress an event rate per million observations.Growth Factor CalculatorCalculate the multiplicative growth factor between two values.Linear Midpoint CalculatorFind the halfway interpolated value between two endpoints.Harmonic Mean CalculatorCalculate the harmonic mean of two positive values.Geometric Mean CalculatorCalculate the geometric mean of two non-negative values.Quadratic Discriminant CalculatorCalculate the discriminant of a quadratic when b and the product a×c are known.Slope CalculatorCalculate line slope from rise and run.Direct Variation CalculatorCalculate y for a direct variation.Inverse Variation CalculatorCalculate y for an inverse variation.Simple Interest Index CalculatorCalculate simple interest earned for one period before any financial/tax assumptions.Doubling Growth CalculatorCalculate a value after a chosen number of doublings.Power of Ten Scale CalculatorScale a coefficient by a power of ten.
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123 certified toolsCategories
Math Calculators
Percentages, powers, logarithms, trigonometry, ratios and practical mathematics.
28 calculators →Geometry Calculators
Areas, perimeters, volumes and common plane and solid geometry formulas.
16 calculators →Statistics Calculators
Means, rates, proportions, variability and descriptive statistics.
18 calculators →Science Calculators
Deterministic physics, chemistry, electrical and measurement formulas.
31 calculators →Everyday Calculators
Practical calculators for costs, recipes, utilities, projects and daily decisions.
29 calculators →Unit Conversion Calculators
Convert common units of length, mass, volume and temperature.
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