// 17 calculators · 4 science fields

Science
Calculators

Every calculator you need for physics, astronomy, aerospace and nuclear science — all free, all instant, no sign-up ever.

17+
Calculators
4
Science Fields
6
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Kinetic Energy
KE = ½mv²
Physics
Calculate the kinetic energy of any moving object from its mass and velocity.
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Gravitational Force
F = Gm₁m₂/r²
Physics
Newton's law of universal gravitation — force between any two masses.
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Wave Calculator
v = fλ
Physics
Find frequency, wavelength or wave speed. Works for sound, light and all waves.
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Photon Energy
E = hf
Physics
Calculate the energy of a photon from its frequency or wavelength using Planck's equation.
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Ohm's Law
V = IR
Physics
Solve for voltage, current or resistance. Essential for electronics and circuits.
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Free Fall Calculator
h = ½gt²
Physics
Calculate time and impact velocity for objects in free fall from any height.
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Escape Velocity
v = √(2GM/r)
Astronomy
Minimum speed to escape any planet's gravity. Includes Earth, Mars, Moon, Jupiter presets.
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Orbital Speed
v = √(GM/r)
Astronomy
Calculate orbital velocity for satellites and moons. Includes LEO, GEO and solar system presets.
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Distance Converter
ly · pc · AU · km
Astronomy
Convert between light-years, parsecs, astronomical units, kilometres and miles.
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Orbital Period
T² ∝ a³
Astronomy
Kepler's third law — find the orbital period from the semi-major axis and central mass.
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Delta-V Calculator
Δv = Isp × g₀ × ln(m₀/mf)
Aerospace
Tsiolkovsky's rocket equation — calculate total velocity change from fuel mass and Isp.
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Mach Speed Converter
Mach · km/h · mph
Aerospace
Convert between Mach number, km/h, mph and m/s. Useful for aircraft and spacecraft speeds.
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Thrust-to-Weight Ratio
TWR = F / (mg)
Aerospace
Check if your rocket can lift off — TWR must exceed 1 to leave the ground.
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Orbital Speed (Quick)
v = √(GM/r)
Aerospace
Quick orbital speed calculator from the main tools page.
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Radioactive Decay
N(t) = N₀e^(-λt)
Nuclear
Calculate remaining radioactivity over time. Includes half-life presets for common isotopes.
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E = mc² Calculator
E = mc²
Nuclear
Convert mass to energy using Einstein's equation. See the energy locked inside any amount of matter.
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Half-Life Reference
10 Common Isotopes
Nuclear
Quick half-life lookup table for Carbon-14, Uranium-235, Plutonium-239, Iodine-131 and more.
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🔧 More Tools
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Unit Converter
200+ science units
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NASA APOD
Daily astronomy image
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ISS Live Tracker
Real-time position
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Asteroid Tracker
Today's near-Earth objects