Education Tools

Convert your 4-section ACT raw scores into a 1-36 composite. Pick English, Math, Reading and Science scores and instantly see your ACT composite, subject averages and score band. Free.

Estimate your Australian ATAR from your best scaled subject scores. Enter up to six subjects, get an aggregate and a realistic ATAR band. Free and private.

Calculate your semester CGPA on the Indian 10-point scale. Enter credits and grade points per subject, get a weighted CGPA and percentage. Free and private.

Compute your college GPA on the 4.0 scale. Pick letter grades, set credit hours per course and instantly see your weighted GPA, total points and a target-GPA planner. Free.

Weighted grade calculator for students. Enter assignments, their scores and weights to see your current course grade and exactly what you need on the final. Free.

Apply a grading curve to a class's scores. Add flat points, curve to the highest score, or scale to a target mean — see every adjusted grade instantly. Free.

Calculate your score in exams with negative marking (JEE, NEET, UPSC, CA). Enter correct, wrong and unattempted answers plus the penalty to see your net score. Free.

Estimate your PSAT/NMSQT score from section raw scores. Enter Reading & Writing and Math raw scores to get a 320–1520 total and your likely SAT range. Free.

Estimate your SAT score from section raw scores. Enter Reading & Writing and Math raw scores to get a 400–1600 total and your likely score band. Free.

Convert your Semester GPA (SGPA) into a Cumulative GPA (CGPA). Enter each semester's SGPA and credits, and instantly get your overall CGPA. Supports 10-point and 4-point scales.

Free combined gas law calculator. Solve P1V1/T1 = P2V2/T2 for any of the six variables with unit conversion for pressure, volume and temperature.

Free Coulomb's law calculator. Find the electrostatic force between two point charges with microcoulomb and nanocoulomb support, plus automatic attract/repel direction.

Free dilution calculator. Solve C1V1 = C2V2 for stock concentration, stock volume, final concentration or final volume with M, mM and µM support.

Free earth curvature calculator. Find the distance to the horizon, the drop caused by curvature and how much of a distant object is hidden, in km or miles.

Free flow rate calculator. Convert between volumetric flow, pipe cross-section and flow velocity using Q = A·v, with diameter to area conversion built in.

Free free fall calculator. Solve v = gt and h = ½gt² for velocity, distance or time, with selectable gravity for Earth, the Moon, Mars and more.

Free Hardy-Weinberg equilibrium calculator. Enter allele or genotype frequencies and get p, q, p², 2pq and q² with a chi-square style consistency check.

Free kinetic energy calculator. Solve KE = ½mv² for energy, mass or velocity, with joules, kilojoules, calories and mph / km/h unit support.

Free molarity calculator. Convert between molarity, moles, solution volume and solute mass using the molar mass, with mM and µM support.

Free pH calculator. Convert between pH, pOH, hydrogen ion concentration [H⁺] and hydroxide ion concentration [OH⁻] at any temperature-compensated Kw.

Calculate gravitational potential energy U = mgh. Enter mass, gravity and height to find energy in joules, kilojoules and more.

Calculate Reynolds number Re = ρvD/μ to determine laminar, transitional or turbulent flow. Enter fluid density, velocity, diameter and dynamic viscosity.

Calculate heat energy using Q = mcΔT. Enter mass, specific heat capacity and temperature change to find required heat in joules, calories and more.

Calculate water potential Ψ = Ψs + Ψp for osmosis and plant physiology. Enter solute and pressure potential to find MPa or kPa values.

Create and study flashcards from your own text — import or type cards, flip, shuffle and track right/wrong scores.