Middle School
Practice one-variable equations, proportional functions, square roots, expansion, factorization and two-draw probabilities with worked steps.
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Chemistry
Solubility and Crystallization Calculator
Learning & Education · Middle School · High School · Science & LabEstimate dissolved and solid solute before and after a solubility change. Separate newly formed crystals from solid already present at the start.
Open calculator ↗Chemical Equation Balancer
Learning & Education · Middle School · High School · Science & LabBalance a neutral chemical equation using exact element conservation. Return the smallest positive integer coefficients and an atom-count check for every element.
Open calculator ↗Limiting Reactant and Yield Calculator
Learning & Education · Middle School · High School · Science & LabUse an atom-balanced equation and available reactant masses to find the limiting reactant, leftover material and theoretical product masses.
Open calculator ↗Geometry
Cone and Cylinder Net Calculator
Learning & Education · Middle SchoolFind the flat net dimensions for a right circular cone or cylinder. Calculate sector angle or rectangle width, base circles and net surface area.
Open calculator ↗Tangents from a Point to a Circle
Learning & Education · Middle SchoolFind the tangent contact points and tangent length from an entered point to a circle. Distinguish interior, boundary and exterior points.
Open calculator ↗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 ↗Physics
Humidity and Dew Point Calculator
Learning & Education · Middle School · High School · Science & LabEstimate dew point from air temperature and relative humidity, or relative humidity from dew point. Compare actual and saturated water-vapor pressures.
Open calculator ↗P–S Wave Distance Calculator
Learning & Education · Middle School · High School · Science & LabEstimate source-path distance from a P/S arrival-time difference and entered wave speeds. Compare both travel times in a uniform-medium model.
Open calculator ↗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.
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