All Tools · Page 39
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Business
Geometry
Triangle Centers Calculator
Learning & Education · Middle School · High SchoolCalculate a triangle’s centroid, incenter, circumcenter and orthocenter from its vertices. Compare radii and locate the centers on equal-scale axes.
Open calculator ↗Polygon Interior Angles Calculator
Learning & Education · Middle SchoolFind a missing interior angle or check a complete polygon angle list. Choose convex-only angles or allow reflex angles in a simple concave polygon.
Open calculator ↗Triangle Angle Bisector Calculator
Learning & Education · Middle School · High SchoolFind the internal angle-bisector length and the two segments it creates on the opposite side. Enter three sides and inspect the labelled triangle.
Open calculator ↗Rectangle from Area and Perimeter
Learning & Education · Middle SchoolRecover a rectangle’s two side lengths from its area and perimeter. Detect impossible measurements and the square boundary, with a dimensioned outline.
Open calculator ↗Mathematics
Radical Arithmetic Calculator
Learning & Education · Middle SchoolAdd, subtract, multiply or divide two real radical terms. Simplify square factors, combine matching radicals and rationalize a radical denominator.
Open calculator ↗Repeating Decimal Calculator
Learning & Education · Middle SchoolConvert a repeating decimal block to an exact fraction, or find a fraction’s terminating prefix and complete repeating cycle.
Open calculator ↗Integer Quotient and Remainder Calculator
Learning & Education · Middle SchoolDivide signed integers with a nonnegative remainder. Verify the identity and use the same modulo convention for cyclic positions and clock arithmetic.
Open calculator ↗Measurement Interval Calculator
Learning & Education · Middle SchoolPropagate absolute measurement bounds through addition, subtraction, multiplication or division. See a guaranteed enclosing interval rather than a statistical confidence interval.
Open calculator ↗Physics
Electricity Use and Cost Calculator
Learning & Education · Middle School · High School · Money ManagementEstimate energy and cost for an appliance from active and standby power, daily schedule and duty cycle. Enter your own price per kilowatt-hour and fixed period charge.
Open calculator ↗Mechanical Work Calculator
Learning & Education · Middle School · High School · Science & LabCalculate work done by a constant force over a displacement. Account for the angle between force and motion, including zero and negative work.
Open calculator ↗Power and Efficiency Calculator
Learning & Education · Middle School · High School · Science & LabCompare input energy with useful output over the same time. Find average input/output power, energy loss and conversion efficiency.
Open calculator ↗Reflection and Refraction Calculator
Learning & Education · Middle School · High School · Science & LabFind reflected and refracted ray directions from incidence angle and two refractive indices. Detect total internal reflection and show the critical angle.
Open calculator ↗Echo Distance Calculator
Learning & Education · Middle School · High School · Science & LabFind one-way reflector distance, echo return time or sound speed. Keep the measured round trip separate from the distance to the reflecting surface.
Open calculator ↗Hooke’s Law Calculator
Learning & Education · Middle School · High School · Science & LabFind applied spring force, extension or spring constant in the elastic range. Distinguish applied and restoring forces and calculate stored elastic energy.
Open calculator ↗Lever Balance Calculator
Learning & Education · Middle School · High School · Science & LabFind the effort force needed to balance a load about a fulcrum. Compare perpendicular moment arms, torque and ideal mechanical advantage.
Open calculator ↗Pulley Mechanical Advantage Calculator
Learning & Education · Middle School · High School · Science & LabEstimate effort and rope travel from the number of load-supporting rope segments. Compare ideal geometry with an entered overall lifting efficiency.
Open calculator ↗Buoyancy Calculator
Learning & Education · Middle School · High School · Science & LabCompare an object’s weight with displaced-fluid buoyancy. Enter displacement directly or estimate whether a uniform object floats, sinks or is neutrally buoyant.
Open calculator ↗Hydrostatic Pressure Calculator
Learning & Education · Middle School · High School · Science & LabFind the pressure increase with fluid depth, absolute pressure and the incremental force on a horizontal patch. Keep surface pressure separate from gauge pressure.
Open calculator ↗Statistics
Dice Sum Probability Calculator
Learning & Education · Middle SchoolCount exact outcomes for the sum of fair dice. Choose an exact sum, a tail or an inclusive range and inspect the entire distribution.
Open calculator ↗Box Plot Comparison Calculator
Learning & Education · Middle SchoolCompare two datasets on the same axis using quartiles, Tukey whiskers and outlier points. Inspect differences in median and interquartile range.
Open calculator ↗Mark–Recapture Population Calculator
Learning & Education · Middle School · High SchoolEstimate a closed population from two samples and their marked overlap. Compare the school proportion estimate with the Chapman correction and the observed minimum.
Open calculator ↗Survey Population Estimate Calculator
Learning & Education · Middle School · High SchoolProject a sampled proportion to a known population. Compare the estimate with the logically possible count range and, for small sample fractions, a Wilson sampling interval.
Open calculator ↗Expected Value Calculator
Learning & Education · Middle School · High SchoolEnter discrete outcomes and their probabilities to calculate expected value, net expectation after a fixed cost and outcome spread.
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