Education & Grades
Averages, GPAs and exam scores, calculated with the scale your school uses. Exam estimates show which figures come from the official guide and which are estimates.
All tools
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Chemical Equation Balancer
Balance a chemical equation with the smallest whole-number coefficients. See each step, a check of every element and charge, and why a balance is impossible.
Clock Reading Worksheet
Make printable analogue clock worksheets to read the time or draw the hands, by the hour, half hour, quarter hour or five minutes, with an answer key.
Coulomb's Law Calculator
Enter two electric charges and the distance between them to get the electric force by Coulomb's law, with its direction, the steps and a table by distance.
Density Calculator
Find the density, mass or volume from the other two, in kg/m³ and g/cm³, with a table of the densities of common materials and the working.
Doppler Effect
Enter the source frequency, the source and listener speeds and the speed of sound to get the frequency heard and the change in pitch, with the working.
Energy, Work and Power
Kinetic and potential energy, work from force, distance and angle, and power from work and time. Leave one box empty to solve for it, with the working.
Escape Velocity
Pick a planet or the Moon, or type a mass and radius, to get the escape velocity in km/s and m/s, with the working and a table of all the bodies.
Final Exam Grade Calculator
Find the final exam score you need for your target course grade, and see the grade for each final score from 50 to 100. Shows if it is still possible.
Free Fall Calculator
Enter the height, the time or the impact speed of a fall from rest to get the other two, the impact speed in km/h and a table. No air resistance.
GPA Calculator
Calculate your semester GPA from course credits and letter grades on the 4.0 scale. Add honors and AP or IB weights, and your prior GPA for a cumulative figure.
Grade Curve Calculator
Curve a list of test scores by adding points, scaling the top score to 100 or matching a target mean and standard deviation. See old and new scores.
Gravitational Force Calculator
Enter two masses and the distance between their centres to get the gravitational force by Newton's law, the acceleration of each body and the steps.
Half-Life Calculator
Find what remains of a radioactive substance after a time, or the half-life or the time from two amounts, with the decay constant, a table and the steps.
Ideal Gas Law Calculator
Enter three of pressure, volume, amount of gas and temperature to find the fourth with the ideal gas law PV = nRT, with the working in kPa, litres and kelvin.
Kinematics Calculator
Give any three of displacement, starting speed, final speed, acceleration and time, and get the other two with every root and the working in steps.
Math Worksheet Generator
Printable math worksheets for addition, subtraction, multiplication and division, with or without carrying, and an answer key. Same number, same sheet.
Molar Mass Calculator
Work out the molar mass of a chemical formula in g/mol from standard atomic weights, with brackets, hydrates and each element's share of the mass.
Molarity and Dilution Calculator
Calculate molarity from mass, molar mass and volume, dilute a stock solution by C1V1 = C2V2, or convert mass percent to ppm. Each result shows its working.
Pendulum Period Calculator
Enter the length of a pendulum and the gravitational acceleration to get its period and frequency from T = 2π√(L/g), with the steps of the working.
Percent Yield
Enter masses and molar masses of one or two reactants and the product mass you obtained to get the limiting reactant, theoretical yield and percent yield.
Periodic Table of the Elements
The 118 elements in the standard periodic table, coloured by block, group or atomic mass. Click an element for its atomic weight, configuration and properties.
pH Calculator
Find pH, pOH and ion concentrations at 25 °C for strong acids and bases, weak acids and bases solved exactly, and buffers by Henderson–Hasselbalch.
Pressure Calculator
Pressure from force and area, or hydrostatic pressure at a depth (ρgh), with the same value in Pa, kPa, bar, atm, psi and mmHg. Leave one box empty to solve it.
Projectile Motion
Enter the launch speed, angle and height to get the range, flight time, highest point and impact speed and angle, with a trajectory chart and table.
Snell's Law Calculator
Enter the refractive indices and the incidence angle to get the refraction angle by Snell's law, the speed of light in each medium and the critical angle.
Thin Lens Image Calculator
Enter the focal length of a converging or diverging lens, the object distance and its height to get the image distance, magnification and image height.
Wavelength and Frequency
Enter a wavelength or a frequency of light or radio to get the other, with the energy of one photon in joules and electronvolts and the working.
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Your school's own rules always win: check the weighting and rounding your institution uses.