52 free tools · Education
Free Student, Science & Grade Calculators
Calculators for students and teachers: work out your GPA and course grades, then move on to physics, chemistry, electrical engineering and biology problems — every one shows the formula and the working.
Use them as often as you like — free, with no sign-up and no daily limits.
- Free
- No sign-up
- Phone & computer
- Grades & GPA7
- Physics13
- Chemistry10
- Electrical & engineering12
- Biology2
- Research & citations8
52 tools
All Student, Science & Grade Calculators
Grouped by what they help you do.
52 tools
- GPA CalculatorPopularSemester and cumulative GPA from your grades and credit hours.
- Weighted Grade CalculatorYour overall course grade from weighted assignments and exams.
- Final Exam Grade CalculatorThe score you need on your final exam to reach the grade you want.
- Marks Percentage CalculatorTurn exam marks into a percentage, for one subject or many.
- CGPA to Percentage ConverterConvert CGPA to percentage using common university formulas.
- Test Grade CalculatorA test score from questions wrong or points earned, with a printable grading chart.
- GPA Goal PlannerThe GPA you need in your remaining credits to reach a target cumulative GPA.
- Speed, Distance & Time CalculatorPopularFind speed, distance or travel time from the other two, in km, miles or metres.
- Acceleration CalculatorAcceleration, final or initial velocity, or time — plus distance covered.
- Force Calculator (F = ma)Newton's second law and weight: solve for force, mass or acceleration.
- Momentum CalculatorMomentum p = mv and impulse J = FΔt, solved for any variable.
- Energy CalculatorKinetic, potential and mass–energy (E = mc²), solved for any variable.
- Power CalculatorPower from work and time, voltage and current, or force and velocity.
- Pressure CalculatorPressure from force and area, or fluid pressure at depth (ρgh).
- Density CalculatorDensity, mass or volume from the other two — and whether it floats in water.
- Work CalculatorWork done from force and distance, or from power and time, in joules.
- Projectile Motion CalculatorRange, flight time and maximum height for any launch speed, angle and height.
- Gravitational Force CalculatorNewton's law of universal gravitation between any two masses.
- Wavelength CalculatorWavelength from speed and frequency, for sound, light and photons.
- Frequency CalculatorFrequency from the period or from wave speed and wavelength, plus angular frequency.
- Interactive Periodic TablePopularAll 118 elements with atomic numbers, masses, groups and categories. Search and filter.
- Molar Mass CalculatorMolar mass of any formula with a breakdown by element and mass percent.
- Chemical Equation BalancerBalance any chemical equation with the smallest whole-number coefficients.
- Stoichiometry CalculatorMasses and moles of every reactant and product from one known amount.
- Mole CalculatorConvert grams to moles, moles to grams, and moles to particles.
- Molarity CalculatorMolarity, mass of solute to weigh out, or volume of solution needed.
- Dilution & Concentration CalculatorC₁V₁ = C₂V₂ dilutions, mass percent and parts per million.
- pH CalculatorConvert between pH, pOH, [H⁺] and [OH⁻] — and see if it's acidic or basic.
- Ideal Gas Law CalculatorSolve PV = nRT for pressure, volume, moles or temperature.
- Half-Life CalculatorRadioactive decay: amount remaining, time elapsed, initial amount or half-life.
- Ohm's Law CalculatorPopularVoltage, current, resistance and power from any two of them.
- Resistance CalculatorResistors in series and parallel, and the resistance of a length of wire.
- Resistor Color Code CalculatorRead 4- and 5-band resistor colour codes, with the tolerance range.
- Voltage Divider CalculatorOutput voltage of a resistor divider, or the resistor you need for a target voltage.
- Capacitor CalculatorCapacitors in series and parallel, stored charge and energy, and RC time constants.
- Inductor CalculatorInductors in series and parallel, stored energy and inductive reactance.
- Power Factor CalculatorPower factor, reactive power and the correction needed, single- or three-phase.
- Coulomb's Law CalculatorElectrostatic force between two charges, attractive or repulsive.
- Beam Load CalculatorReactions, bending moment, shear and deflection of a simply supported beam.
- Stress CalculatorNormal stress from force and area, and Young's modulus from stress and strain.
- Strain CalculatorStrain from change in length, or from stress and Young's modulus.
- Reynolds Number CalculatorReynolds number for pipe flow and whether it's laminar or turbulent.
- Punnett Square CalculatorMonohybrid, dihybrid and trihybrid crosses with genotype and phenotype ratios.
- DNA Complement & Transcription ToolComplement, reverse complement, mRNA, protein translation and GC content.
- APA Citation GeneratorPopularAPA 7th edition references and in-text citations for books, articles and websites.
- MLA Citation GeneratorMLA 9th edition Works Cited entries and in-text citations.
- Chicago Citation GeneratorChicago Manual of Style bibliography entries and author-date citations.
- Harvard Referencing GeneratorHarvard (Cite Them Right) references and in-text citations.
- IEEE Citation GeneratorIEEE numbered references for engineering and computer science papers.
- Reference List GeneratorBuild a full bibliography in APA, MLA, Chicago, Harvard or IEEE — sorted and ready to paste.
- BibTeX GeneratorCreate BibTeX entries for LaTeX, Overleaf, Zotero and Mendeley.
- Literature Review MatrixOrganise sources by aim, method, findings and limitations in an editable table.
Education guides
Step-by-step help that goes with these tools.
- Guide · EducationThe 12 Best AI Course Creators in 2026, Compared by What They Actually DoAI course generators, course platforms, video tools and corporate authoring compared: what each AI creates, real prices, free plans and the hidden fees to check.Oct 11, 2026 · 16 min read
- Guide · EducationWhat Is 18 Out of 30 as a Grade? Test Score to Percentage Charts18/30 is 60%, a D−. Score-to-percentage and letter-grade charts for tests out of 10, 20, 25, 30, 40 and 50 — plus the rounding rule that turns a B into a B+.Oct 8, 2026 · 6 min read
- Guide · EducationWhat Grade Do I Need on My Final? The Formula, ExplainedWork out the exact final exam score you need for the grade you want, with worked examples, weighted and points-based classes, and syllabus rules that change the answer.Oct 8, 2026 · 6 min read
Education
Common questions
Quick answers about these free tools.
Which GPA scale is used?
The GPA calculator uses the common US 4.0 scale by default and lets you switch to a 4.3 scale or enter grade points directly.
Will my school calculate it the same way?
Usually, but not always. Some schools weight honors classes or round differently. Always check your official transcript.
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