Science Formula Sheet for Biology, Chemistry, and Physics Exams

Overview

This article is a practical science formula sheet for students revising across biology, chemistry, and physics. It is designed as a central page you can revisit throughout the term rather than a one-time read. The goal is not to overwhelm you with every equation from every syllabus. Instead, it focuses on the formulas and symbolic relationships that most often cause confusion in exam conditions: ratios, rates, concentration, energy, force, motion, waves, electricity, and a few biology calculations that students often forget to practice.

One useful way to think about any science equations sheet is that each formula has four parts:

• The relationship: what depends on what
• The symbols: letters that may vary between textbooks
• The units: what your final answer should look like
• The context: the type of question where the formula belongs

That last part matters. Many students do not lose marks because they never saw the formula before. They lose marks because they choose the wrong one, mix units, or use a formula without understanding the question setup. So as you use this page for exam formula revision, keep asking three quick questions:

1. What quantity is the question asking for?
2. What values are already given?
3. Do the units match the formula I want to use?

If you are building a revision plan, split your work into two layers. First, use this article as a master list. Second, create a smaller personal sheet with only the formulas you repeatedly forget. That smaller sheet is the one you review most often.

What to track

The best way to use a formula page is to track recurring patterns, not just read equations passively. Below is a subject-by-subject checklist of what to monitor as you study biology chemistry physics formulas.

Biology formulas and calculations

Biology is often seen as the least formula-heavy science, but many exams still include percentage changes, rates, magnification, surface area ideas, and basic genetics or ecology calculations. These are easy marks if you practice them regularly.

• Magnification: magnification = image size / actual size
• Percentage change: ((new value - original value) / original value) × 100
• Mean: total / number of values
• Rate: change in quantity / time
• Surface area to volume ratio: surface area / volume

What to track in biology:

• Whether your course expects units such as mm, cm, or micrometers
• Whether you are using absolute change or percentage change
• Whether a graph question is really asking for a rate from a gradient
• Whether a practical question expects a ratio rather than a sentence answer

Biology formulas often appear inside data analysis tasks, so they are closely linked to tables, graphs, and experimental method questions. If you are revising body systems or energy transfer in living things, pair this page with Human Body Systems Study Guide: Functions, Organs, and Common Exam Questions and Photosynthesis and Cellular Respiration Comparison Chart for Students.

Chemistry formulas and symbolic relationships

Chemistry formulas usually become difficult when students mix up quantity, concentration, and particle relationships. A compact chemistry formulas cheat sheet should always include moles, mass, concentration, and gas or solution relationships that repeat across many topics.

• Moles: moles = mass / relative formula mass
• Concentration: concentration = moles / volume
• Mass from moles: mass = moles × relative formula mass
• Percentage yield: (actual yield / theoretical yield) × 100
• Atom economy: (desired product formula mass / total formula mass of products) × 100
• Density: density = mass / volume
• pH relationships: often tested conceptually, sometimes with logarithmic relationships depending on course level

What to track in chemistry:

• Volume units: dm³ versus cm³
• Whether the formula requires molar mass, formula mass, or relative atomic mass
• Whether your answer needs significant figures or standard form
• Whether the question is about particles, mass, or solutions

Many chemistry errors come from unit conversion rather than from the formula itself. For example, a student may know that concentration = moles / volume but forget to convert cm³ to dm³. That is why your revision notes should attach a unit warning beside each formula. For topic-specific support, revisit Mole Concept Study Guide With Formulas, Conversions, and Practice Questions, Acids and Bases Study Guide: pH, Strong vs Weak, and Titration Basics, Balancing Chemical Equations Practice Worksheet With Answers, and Periodic Table Trends Explained: Atomic Radius, Ionization Energy, and Electronegativity.

Physics formulas and equations

Physics usually places the heaviest demand on formula fluency. A strong physics study guide should not just list equations. It should also connect them to diagrams, unit handling, and rearrangement practice. The core groups below show up repeatedly in homework and tests.

Motion and kinematics

• Speed: speed = distance / time
• Acceleration: acceleration = change in velocity / time
• Velocity relationship: velocity = displacement / time

If your course includes constant-acceleration equations, review them carefully with worked examples in Kinematics Equations Cheat Sheet With Worked Problems.

Forces and energy

• Force: force = mass × acceleration
• Weight: weight = mass × gravitational field strength
• Work done: work done = force × distance
• Kinetic energy: kinetic energy = 1/2 × mass × speed²
• Gravitational potential energy: potential energy = mass × gravitational field strength × height
• Power: power = energy transferred / time

These formulas often appear together, especially in multi-step questions. Continue with Energy Conservation Study Guide: Kinetic, Potential, and Mechanical Energy and Newton’s Laws of Motion Study Guide With Real-World Examples and Practice.

Waves and electricity

• Wave speed: wave speed = frequency × wavelength
• Charge flow: current = charge / time
• Potential difference relationship: voltage = current × resistance
• Electrical power: power = voltage × current

For wave questions, unit tracking is especially important. Frequency is usually in hertz, wavelength in meters, and speed in meters per second. See Waves and Sound Study Guide: Frequency, Wavelength, and Speed Formula for focused revision.

What to track in physics:

• Whether the symbols used by your teacher match the textbook version
• Whether your values are scalar or vector quantities
• Whether you need to rearrange the formula before substituting numbers
• Whether your final unit is sensible for the quantity asked

Symbols and unit notes to monitor across all sciences

A central revision page is most useful when it also tracks symbols and units that repeatedly trip students up. Add a short note beside each formula for:

• Common symbol alternatives: for example, voltage may be written as V, volume may also be V, so context matters
• Standard units: seconds, meters, kilograms, moles, mol/dm³, joules, newtons
• Conversions: cm to m, g to kg, cm³ to dm³, minutes to seconds
• Question type: graph, experiment, word problem, calculation table, practical analysis

This turns a plain formula list into a working science study guide that supports exam decisions.

Cadence and checkpoints

The value of a formula sheet comes from repeated use. A tracker-style revision page should be reviewed on a simple schedule, with small checkpoints that show whether your recall is improving.

Weekly checkpoint

Once a week, spend 10 to 15 minutes on active recall. Cover the right side of your notes and try to write:

• The formula from memory
• What each symbol means
• The standard unit for each quantity
• One sample context where the formula is used

Mark each formula with one of three labels: secure, shaky, or forgotten. Your personal revision list should mostly contain the shaky and forgotten formulas.

Monthly or topic-end checkpoint

At the end of a topic or roughly once a month, test whether you can apply the formulas rather than just recite them. Pick a few mixed questions from biology, chemistry, and physics. Do not organize them by topic. Mixed practice better reflects real exam conditions, where you must identify the method yourself.

At this stage, track:

• How often you choose the wrong formula
• How often you forget a unit conversion
• How often algebraic rearrangement slows you down
• Which subjects produce the most avoidable marks lost

Pre-exam checkpoint

In the final days before a quiz or exam, your formula review should become more selective. Do not reread everything equally. Return to:

• Formulas that link to common exam topics
• Formulas you still need to rearrange carefully
• Any equation with unit conversions built into the question style
• Any biology calculation you tend to overlook because it seems easy

This is also the best time to use linked practice pages and worked examples rather than reading notes alone.

How to interpret changes

If you revisit this page over time, you should notice patterns in what gets easier and what still causes friction. Interpreting those patterns correctly will help you revise more efficiently.

If recall improves but scores do not

This usually means the problem is not memorization. It is application. You may know the formula but still struggle to:

• Identify which equation fits a worded question
• Convert units correctly
• Rearrange the equation
• Read values from a graph or diagram

In that case, spend less time copying formulas and more time solving short mixed problems.

If one subject keeps slipping

That often means your review cycle is uneven. Students sometimes review physics formulas often because they look difficult, while neglecting chemistry concentration equations or biology percentage calculations. If one subject repeatedly falls into the forgotten category, add it to your weekly active-recall set until it becomes stable.

If errors are mostly unit-based

You do not need more formulas. You need a unit routine. Before every substitution, write the quantity and unit beside the value. Then convert all units before doing the arithmetic. This single habit can improve accuracy quickly.

If the formula list feels too long

That is a sign to separate your reference sheet from your memory sheet. Keep this article as the full reference. Then make a shorter page with only the items you are currently expected to know and the ones you repeatedly miss. A formula sheet should reduce cognitive load, not add to it.

When to revisit

This page works best when you return to it at predictable moments. Do not wait until the night before an exam. Revisit your science formula sheet when any of the following happens:

• You start a new topic with unfamiliar symbols
• You notice repeated mistakes in homework or quizzes
• You move from learning examples to timed exam practice
• Your teacher introduces a formula list, data sheet, or equation booklet
• You have not reviewed a topic for several weeks

To make this article practical, use the following five-step routine each time you come back:

1. Scan: read only the subject section you currently need
2. Recall: write the formula from memory before checking it
3. Annotate: add a note about symbols, units, or common mistakes
4. Apply: complete two or three mixed questions immediately
5. Update: move weak formulas onto your personal short list

If you are preparing for GCSE science revision, AP science courses, or general school exams, the exact syllabus may differ, but the habit is the same: revisit formulas on a regular cadence, connect them to question types, and keep refining the list of what still needs work.

As a final action step, build your own bookmark system. Save this page as your master science equations sheet, then pair it with one topic guide from the subject you find hardest. That way, each review session includes both the formula and a worked explanation. Over time, that is what turns a formula page from a static note into a dependable exam-prep tool.