Science

Science and learning tools

Every science tool on OpenTools. Physics, chemistry, biology and statistics calculators and study helpers, worked out in your browser.

All 52 of them are listed below. Each one runs inside this tab, so nothing you open or type is uploaded — see the proof.

• APA citation formatterFormat supplied facts in a basic APA-like pattern.
• Astronomy-unit converterConvert kilometres, AU, light-years, and parsecs using fixed constants.
• Attendance-percentage calculatorCalculate current attendance and sessions needed to reach a target.
• Battery-runtime calculatorEstimate ideal runtime from capacity, load current, and usable efficiency.
• BibTeX generatorGenerate one escaped BibTeX article entry from supplied facts.
• BMI calculatorCalculate Body Mass Index and Ponderal Index from weight and height.
• BMR calculatorCalculate Basal Metabolic Rate using Mifflin-St Jeor and Revised Harris-Benedict formulas.
• Buoyancy calculatorMultiply fluid density, displaced volume and gravity for the ideal Archimedean buoyant force in newtons. Gravity starts at 9.80665 m/s² and can be changed.
• Capacitor-code calculatorDecode a three-digit EIA capacitance code into pF, nF, and µF.
• CGPA calculatorCalculate cumulative GPA from period GPA and credits.
• Chicago citation formatterFormat supplied facts in a basic Chicago-like pattern.
• Citation generatorFormat supplied citation facts in a selected basic style.
• Coulomb’s-law calculatorCalculate electrostatic force magnitude between two point charges.
• Credit-weighted GPA calculatorCalculate GPA from course, credits, and supplied grade points.
• Decibel/intensity converterConvert sound intensity to dB SPL reference level or back.
• Density calculatorDivide a mass in kilograms by a volume in cubic metres for density in kg/m³. The volume has to be above zero, so an empty volume is rejected.
• Doppler-effect calculatorCalculate classical observed frequency for collinear source/observer motion.
• Electric-power calculatorCalculate DC power, resistance, and conductance from voltage/current.
• Exam-score calculatorCalculate score from correct, wrong, blank, marks, and penalty.
• Flashcard makerConvert front/back lines into numbered Markdown flashcards.
• Free-fall calculatorCalculate ideal fall time and impact speed from rest.
• Grade calculatorCalculate earned percentage and a stated simple letter band.
• Half-life calculatorCalculate remaining quantity after elapsed half-lives.
• Ideal body weight calculatorCalculate ideal body weight estimates using the Devine, Robinson, Miller and Hamwi formulas.
• Kinetic-energy calculatorEnter a mass in kilograms and a speed in metres per second to get ½mv² in joules; a negative velocity is fine, since the speed term is squared.
• LED resistor calculatorCalculate a series resistor and its ideal dissipation.
• Magnification calculatorCalculate linear magnification from image and object size.
• MLA citation formatterFormat supplied facts in a basic MLA-like pattern.
• Mole calculatorCalculate moles and particle count from mass and molar mass.
• Momentum calculatorWork out linear momentum as mass times velocity, with mass in kilograms and velocity in metres per second; a negative velocity keeps its sign in the result.
• Ohm’s-law calculatorCalculate resistance and power from voltage and current.
• pH calculatorCalculate ideal pH and pOH from hydrogen-ion concentration.
• Planet-weight calculatorCalculate force from mass using a selected approximate surface gravity.
• Potential-energy calculatorCalculate mgh in joules with explicit gravitational acceleration.
• Projectile-motion calculatorCalculate level-ground ideal flight time, range, and peak height.
• Quadratic function-table generatorGenerate f(x) = ax² + bx + c for a bounded x range.
• Quiz generator workspaceTurn supplied question/answer/distractor facts into a printable quiz.
• Radioactive-decay calculatorCalculate N = N₀e^(−λt) from a supplied decay constant.
• Resistor color-code calculatorPick the two digit bands, a multiplier from silver to blue and a tolerance band, and read back the resistance in ohms with its tolerance range.
• Reynolds-number calculatorDivide density times velocity times characteristic length by dynamic viscosity for the dimensionless Reynolds number. Inputs are SI: kg/m³, m/s, m, Pa·s.
• Set calculatorCalculate union, intersection, differences, and symmetric difference.
• Solution dilution calculatorSolve V₂ from the ideal dilution relation C₁V₁ = C₂V₂.
• Sound-intensity calculatorCalculate intensity from acoustic power over area and level versus 10⁻¹² W/m².
• Statistics-distribution viewerSummarize a finite numeric sample with quartiles and population deviation.
• Study-time plannerAllocate topic hours sequentially across bounded study days.
• TDEE calculatorEstimate Total Daily Energy Expenditure from BMR (Mifflin-St Jeor) and an activity multiplier.
• Thin-lens equation calculatorSolve image distance and magnification from focal/object distances.
• Truth-table generatorEvaluate a bounded Boolean expression over all variable combinations.
• Unit-circle value viewerCalculate radians, sine, cosine, and tangent for an angle.
• Venn-diagram data builderCalculate the seven exclusive regions for three supplied sets.
• Wave-speed calculatorMultiply frequency in hertz by wavelength in metres for wave speed in metres per second, the relation behind sound, light and waves on a string.
• Weighted-grade calculatorCalculate a weighted course percentage from component scores/weights.