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ScienceQuest

Science calculators, simulators and 3D anatomy

Physics, chemistry, biology and maths in the browser, from a worked calculation to a body you can turn. Any result can be shared as a link, and every calculation runs on your device.

Show me the current through a 220 ohm resistor

Two bodies meeting on a track, with the centre of mass gliding straight through. Open the elastic and inelastic collision simulator

Anatomy you can turn

24 models and 926 named parts, 203 of them bone, segmented from imaging rather than drawn. Every outline below is projected from the model the viewer loads.

Or start from the whole body or a part of it: Whole body in 3D, Head and neck in 3D, Thorax in 3D, Abdomen and pelvis in 3D, Back and spine in 3D, Upper limb in 3D and Lower limb in 3D.

All 3D anatomy models, and how they are built Find a structure, A to Z

Outlines drawn from BodyParts3D, © The Database Center for Life Science, CC BY 4.0.

Watch the physics happen

Every curve below is drawn by the same code the simulator runs. Open one and change any parameter to watch it redraw.

All tools

42 tools

Mechanics 27

Projectile Motion Simulator Sim Animate a trajectory and read off range, apex and flight time as you change launch speed and angle. Elastic and Inelastic Collision Simulator Sim Collide two bodies and watch momentum survive every time while kinetic energy only survives a perfect bounce. Simple Pendulum Simulator Sim Swing a pendulum, add damping, and watch the small-angle approximation fail at large amplitude. Orbit Simulator Sim One launch speed slider walks an orbit from circle through ellipse to escape. Mass Spring Simulator Sim Simple harmonic motion with damping and a driving force, plus the resonance curve. Density Calculator Density, mass or volume, with g/cm³ and kg/m³ side by side.
See all 27 mechanics tools

Chemistry 43

Collision Theory and Activation Energy Simulator Sim See how few molecules clear the activation barrier, and why heating changes that so violently. Molarity Calculator Solve for any one of concentration, mass, molar mass or volume, with units from nM to M. Molar Mass Calculator Type any formula, including hydrates, and get molar mass, percent composition and grams to moles or particles. pH Calculator pH, pOH, [H⁺] and [OH⁻] for strong or weak acids and bases, solved exactly. Periodic Table Ref Interactive periodic table of all 118 elements, with IUPAC atomic masses. Titration Curve Calculator An exact titration curve, with the equivalence pH and the indicator to match it.
See all 43 chemistry tools

Biology 75

Centrifuge RCF Calculator Convert RPM to × g and back for your rotor’s radius. Cell Doubling Time Calculator Doubling time and growth rate from two counts, or project forward. Nucleic Acid Quantification Calculator Turn an A260 reading into ng/µL of DNA or RNA, and get the volume needed for a target mass. Lab and Clinical Calculation Practice Problems Practice Generated lab and clinical calculation questions, marked instantly, with the working shown. Action Potential Simulator Sim Hodgkin-Huxley, with threshold and refractoriness emerging. Oxygen Dissociation Curve Simulator Sim The sigmoid curve, and what moves it left or right.
See all 75 biology tools

Electricity 20

RC Charge and Discharge Simulator Sim Charge a capacitor through a resistor and watch where the time constant comes from. Ohm’s Law Calculator Voltage, current or resistance from V = IR, plus power dissipation. RLC Circuit Simulator Sim A series RLC transient, from ringing through critical damping to sluggish. LED Resistor Calculator Series resistor value, next standard part up and power for any LED. RC Time Constant Calculator Time constant, cutoff frequency and settling time for any RC pair. Capacitor Energy Calculator Energy and charge stored in a capacitor from capacitance and voltage.
See all 20 electricity tools

Waves & Optics 17

Wavelength and Frequency Calculator Wavelength to frequency and back, for light, sound or any wave speed. Standing Wave Simulator Sim Harmonics on a string, with the two travelling waves that superpose to make them. Ray Diagram Simulator Sim The three principal rays, with the image located where they cross. Photon Energy Calculator Photon energy from wavelength, in eV, joules and kJ per mole. Snell’s Law Calculator Solve n₁sinθ₁ = n₂sinθ₂ for any term, with the critical angle shown for the pair of media. Thin Lens Calculator Solve the thin lens equation and get magnification with the image type spelled out.
See all 17 waves & optics tools

Thermodynamics 15

Heat Engine and Carnot Cycle Simulator Sim Run a gas around a thermodynamic cycle and read the work off the enclosed area. Ideal Gas Law Calculator Solve PV = nRT for any variable, with kelvin conversion handled for you. Calorimetry Calculator Heat, mass, specific heat or ΔT from q = mcΔT, in joules or calories. Heating Curve Calculator Energy from ice to steam, counting every stage a single m c dT misses. Thermodynamics Practice Problems Practice Generated thermodynamics questions, marked instantly, with the substitution shown. Latent Heat Calculator Heat to melt or boil a mass, and why the thermometer stops moving.
See all 15 thermodynamics tools

Maths & Data 21

Riemann Sum and Integral Explorer Sim Watch rectangles converge on an integral, and compare how fast each rule gets there. Derivative and Tangent Line Explorer Sim Sweep a tangent along a curve and watch the derivative draw itself underneath, one gradient at a time. Standard Deviation Calculator Mean, SD, SEM and a t-based confidence interval from pasted measurements. Unit Converter Convert between every unit this site uses, with the whole group shown at once. Graphing Calculator Visual Type a function, get a curve. Pan, zoom, and read exact values off it. Derivative Calculator Exact derivatives with every rule named, from the product rule to the chain rule.
See all 21 maths & data tools

Browse by subject

Mechanics Motion, forces and energy 27 Chemistry Solutions, reactions and stoichiometry 43 Biology Anatomy, physiology and lab work 75 Electricity Circuits and fields 20 Waves & Optics Oscillations, sound and light 17 Thermodynamics Heat, gases and entropy 15 Maths & Data Calculus, graphs and error analysis 21

Reference: data for all 118 elements, 27 unit conversion tables, the formula sheet and 926 anatomy structures, A to Z.

Teaching with these?

You can put 182 of them on a class page or LMS for free, with no ads inside the frame. Embed a tool.

Answers you can check

The maths is shown, not hidden

Every calculator and simulator states the governing equation and, where a closed-form solution exists, uses it. The numbers match a hand calculation to the last digit displayed rather than merely coming close.

Same inputs, same answer

Simulations run on a fixed timestep rather than frame timing, so a phone and a 144 Hz monitor step through identical physics. A shared link reproduces exactly what the sender saw.

Units handled properly

Values convert to a single base unit before any arithmetic, so mixing microlitres with millimolar is safe. Results are rounded to honest significant figures rather than fifteen meaningless decimals.

Calculations stay in your browser

Every calculation runs on your device, with no account and nothing uploaded for processing. The values you enter are kept in the page address so results can be shared, and that address can reach this site’s server and our advertising partner.