Science & math calculators that show their work
Instant answers with the formula, a worked example and a live chart for every calculation. Just describe what you want to find.
Browse by subject
Pick a category — or use the Calculators menu at the top from any page.
Physics
Mechanics & Motion
Kinematics, forces, energy, momentum, rotation and gravity.
82 calculators →Thermodynamics & Fluids
Heat, gases, engines, pressure, buoyancy and fluid flow.
71 calculators →Electricity & Magnetism
Circuits, fields, capacitors, inductors and AC power.
78 calculators →Waves, Sound & Optics
Lenses, mirrors, interference, sound and oscillations.
72 calculators →Modern Physics & Astronomy
Relativity, quantum physics, nuclear decay, orbits and stars.
69 calculators →Chemistry
General Chemistry
Moles, stoichiometry, gas laws, atoms and thermochemistry.
72 calculators →Solutions, Acids & Kinetics
Molarity, pH, buffers, equilibrium, kinetics and electrochemistry.
73 calculators →Biology
Genetics & Molecular Biology
DNA, Punnett squares, Hardy-Weinberg, PCR and lab dilutions.
66 calculators →Ecology & Evolution
Populations, growth models, diversity indices and enzymes.
61 calculators →Human Body & Health
BMI, metabolism, heart, lungs, hydration and dosing.
63 calculators →Mathematics
Algebra & Calculus
Equations, sequences, logs, derivatives, integrals and numbers.
72 calculators →Geometry & Trigonometry
Areas, volumes, triangles, circles, coordinates and vectors.
72 calculators →Statistics & Probability
Descriptive stats, distributions, confidence intervals and tests.
74 calculators →Earth & Environment
Earth & Environmental Science
Weather, geology, climate, energy and water quality.
75 calculators →Popular calculators
Frequently used by students and teachers.
How it works
Say what you need
Search by intent — “how long to boil water”, “probability of two sixes” — and we match it to the right calculator.
Enter your numbers
Every calculator starts with a realistic example. Edit any value and results update as you type.
See the why
Read the formula, follow the worked example and explore the interactive chart to build intuition.
Free online calculators for physics, chemistry, biology and math
CalcDepo is an educational collection of 1000 calculators covering mechanics, thermodynamics, electricity, optics, modern physics, chemistry, genetics, ecology, human physiology, algebra, calculus, geometry, statistics and earth science. Each page explains the formula, lists the variables and units, walks through an example and charts how the answer changes — so you learn the concept, not just the number.
Whether you are checking homework, designing a lab, planning an experiment or just curious how far a projectile flies or how acidic a solution is, you can search by what you want to find and get to the right tool in seconds.