Kelvin
K = °C + 273
One sheet · NCERT · Board revision
Class 9 Science Formula Sheet
28 formulas from Mathematics and Science, chapter by chapter. Search, filter, copy, or print. This is a revision sheet — not a replacement for the textbook derivation.
Practice questions aligned to NCERT topics used in CBSE classrooms. These are original exam-oriented questions for revision — not official CBSE board papers and not a guarantee of any exam question. Always match the textbook issued by your school and the latest PDFs on ncert.nic.in and cbseacademic.nic.in.
🔬 Class 9 · Science
Matter in Our Surroundings
🔬 Class 9 · Science
Is Matter Around Us Pure?
Mass percent
mass % = (mass of solute / mass of solution) × 100
🔬 Class 9 · Science
Atoms and Molecules
Mole
1 mol = 6.022 × 10²³ particles
Molar mass idea
Mass of 1 mole in grams = formula mass in u
🔬 Class 9 · Science
Structure of the Atom
Mass number
A = Z + N
Atomic number
Z = number of protons
🔬 Class 9 · Science
Motion
Speed
speed = distance / time
Velocity
v = displacement / time
Acceleration
a = (v − u) / t
Equation 1
v = u + at
Equation 2
s = ut + ½ at²
Equation 3
v² = u² + 2as
From chapter list
v = u + at; s = ut + ½at²; v² = u²+2as
🔬 Class 9 · Science
Force and Laws of Motion
Newton II
F = m a
Momentum
p = m v
Impulse
F Δt = Δp
From chapter list
F = ma; p = mv
🔬 Class 9 · Science
Gravitation
Universal law
F = G m₁ m₂ / r²
Weight
W = m g
Pressure in liquid
P = h ρ g
Density
ρ = m / V
From chapter list
W = mg; P = hρg
🔬 Class 9 · Science
Work and Energy
Work
W = F s cos θ
Kinetic energy
KE = ½ m v²
Potential energy
PE = m g h
Power
P = W / t
From chapter list
KE = ½mv²; PE = mgh
🔬 Class 9 · Science
Sound
Wave relation
v = f λ
Also open
FAQs
Are these all official board formulas?
They are the standard NCERT relations used in CBSE Maths and Science papers. Always match the edition issued by your school.
Why are some Biology items short?
Biology is mostly definitions. Only equations and standard ratios (photosynthesis, Hardy–Weinberg, growth models) sit on this sheet.
Will a formula come as-is in the exam?
Often the paper asks you to use a formula, not recite it. Practise a numerical or a derivation after you memorise the line.