Maths, Science, Physics, Chemistry, Biology – Your Ultimate Cheat-Sheet by Hodu Academy

Get all essential CBSE formulas at your fingertips! This page brings you the most important formulas, definitions, and revision notes for Classes 6–12. Curated by the Hodu Academy team, perfect for quick board revision, NCERT, school tests, JEE/NEET, and Olympiad prep.
Bookmark this cheat-sheet for instant formula recall and scoring 90+ in CBSE.

Table of Contents:

• Science (Class 6-10)
• Maths (Class 6-10)
• Physics (Class 11-12)
• Chemistry (Class 11-12)
• Maths (Class 11-12)
• Biology (Class 11-12)
• Important Formulas (IGCSE)

Physics, Chemistry, Biology – Core Formulas & Concepts

Revision notes for CBSE 6-10: motion, force, simple machines, chemical equations, biology facts, and periodic trends. Download complete PDF below.

Formula / Law	Definition / Note
Density = Mass / Volume	Physical property. Units: kg/m³
Force = Mass × Acceleration	Newton's Second Law (F = m×a)
Speed = Distance / Time	Unit: m/s
Law of Conservation of Mass	Mass is neither created nor destroyed in a chemical reaction.

Algebra, Geometry, Arithmetic, Trigonometry Basics

All essential CBSE Maths formulas for board scoring and fast problem solving.

Formula	Definition / Note
Area of Rectangle = Length × Breadth	Basic area of a rectangle.
Roots of ax²+bx+c=0: x = [-b ± √(b²-4ac)]/2a	Quadratic Equation solution.
Mean = Sum of all values / Number of values	Arithmetic mean (average).
Perimeter of Circle = 2πr	r = radius.

Equations of Motion, Optics, Electricity & More

Revision for CBSE Physics: all major formulas, constants and definitions. Download the full chapterwise PDF.

Formula	Definition / Note
v = u + at	Final velocity (motion equations).
V = IR (Ohm’s Law)	V = voltage, I = current, R = resistance.
1/f = 1/v – 1/u (Lens Formula)	f = focal length, v = image, u = object.
Work = Force × Displacement	Unit: Joule (J).

Atomic Structure, Thermodynamics, Organic, Inorganic & More

Most important chemistry formulas for CBSE boards, NEET, and JEE. Organic, physical, and inorganic chapters included.

Formula	Definition / Note
Molarity (M) = Moles of solute / Volume (L)	Unit: mol/L (concentration).
PV = nRT (Ideal Gas Law)	P = pressure, V = volume, n = moles, R = gas constant, T = temp (K).
pH = -log₁₀[H⁺]	Acidity/basicity of a solution.
Empirical Formula: simplest ratio of elements	E.g., CH₂O for glucose (C₆H₁₂O₆).

Calculus, Algebra, Trigonometry, Coordinate Geometry, Statistics

All must-know Maths formulas for boards, IIT-JEE, and Olympiad level. Step-by-step solutions in the full download.

Formula	Definition / Note
Slope (m) = (y₂–y₁)/(x₂–x₁)	Line joining two points.
Area under y=f(x) from a to b = ∫ₐᵇ f(x) dx	Definite integral.
nPr = n!/(n–r)!	Permutations formula.
a²–b² = (a–b)(a+b)	Algebraic identity.

Genetics, Photosynthesis, Respiration, Human Physiology, Ecology & More

Board-ready Biology formulas, key laws, diagrams, and definitions. NCERT, NEET, and Olympiad friendly. Download chapterwise PDF below.

Key Concept / Formula	Definition / Note
Law of Segregation (Mendel)	Each organism carries two alleles for each trait, which separate during gamete formation.
Photosynthesis: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂	Glucose formation using sunlight and chlorophyll.
ATP (Adenosine Triphosphate)	Universal energy currency of the cell.
DNA: Double Helix Structure	Watson & Crick’s model (1953).

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