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Clear, concise definitions of 100+ financial, health, math, and engineering terms — each linked to related free calculators.
The process of spreading loan payments over time so each payment covers both principal and interest.
A financial product that pays out a fixed stream of income, typically used for retirement planning.
The yearly cost of borrowing money expressed as a percentage, including fees and interest.
The profit earned when an investment or asset is sold for more than its purchase price.
Interest calculated on both the initial principal and the accumulated interest from previous periods.
A three-digit number (300–850) that represents your creditworthiness based on your credit history.
The percentage of gross monthly income that goes toward paying debts, used by lenders to assess borrowing capacity.
The gradual decrease in the value of an asset over time due to wear, age, or obsolescence.
An investment strategy that spreads money across different assets to reduce overall risk.
An upfront cash payment made when purchasing a large asset, representing a percentage of the total price.
A fixed monthly payment made by a borrower to a lender on a specified date, covering both principal and interest.
The ownership value in an asset after subtracting any debts owed against it.
A financial arrangement where a third party holds funds until contractual conditions are met.
A savings product offered by banks where money is deposited for a fixed tenure at a guaranteed interest rate.
A value-added consumption tax levied on most goods and services sold in India, replacing multiple indirect taxes.
The rate at which the general level of prices for goods and services rises, decreasing purchasing power.
The percentage charged by a lender for the use of borrowed money, or the percentage earned on deposited funds.
How quickly and easily an asset can be converted into cash without significantly affecting its market price.
A loan secured by real property that the borrower repays with interest over a set term, typically 15 or 30 years.
The total value of all assets minus all liabilities, representing overall financial health.
Insurance required when a borrower puts down less than 20% on a conventional home loan, protecting the lender against default.
The original amount of money borrowed or invested, excluding interest or earnings.
A ratio measuring the gain or loss from an investment relative to its cost, expressed as a percentage.
An investment strategy where a fixed amount is regularly invested in a mutual fund at set intervals.
A range of income that is taxed at a specific rate in a progressive tax system.
The percentage of alcohol in a person's bloodstream, used to measure intoxication level.
The force of blood pushing against artery walls, measured as systolic over diastolic pressure.
A numerical value calculated from height and weight, used as a screening tool for body fat categories.
The number of calories your body burns at complete rest to maintain basic life functions.
The proportion of total body weight that is composed of fat tissue.
The measured or calculated surface area of the human body in square meters, used in medicine for drug dosing and burn assessment.
Consuming fewer calories than your body burns, which is required for weight loss.
The projected date a pregnant person is expected to give birth, calculated as 280 days (40 weeks) from the first day of the last menstrual period.
A ranking system (0–100) that measures how quickly a carbohydrate-containing food raises blood glucose levels.
Ranges of heart rate intensity used to target specific fitness goals during exercise.
Total body weight minus all body fat — includes muscle, bone, organs, water, and other non-fat tissue.
The three main nutrients the body needs in large amounts: protein, carbohydrates, and fats.
The maximum weight an individual can lift for a single repetition of a given exercise with proper form.
The release of a mature egg from the ovary, typically occurring mid-cycle (around day 14 of a 28-day menstrual cycle).
The amount of dietary protein consumed daily, essential for muscle repair, immune function, and cell growth.
The number of calories your body burns at rest to maintain basic life functions like breathing, circulation, and cell production.
A recurring pattern of sleep stages (light, deep, REM) that repeats approximately every 90 minutes throughout the night.
The total number of calories burned per day, including exercise and daily activities on top of BMR.
The maximum rate of oxygen consumption during exercise, measured in mL/kg/min, indicating cardiovascular fitness.
The ratio of waist circumference to hip circumference, used as an indicator of health risk related to body fat distribution.
Area measures the surface inside a shape (in square units); perimeter measures the distance around it.
A number expressed in base-2 using only the digits 0 and 1, fundamental to computer science and digital electronics.
The distance around the outside of a circle, calculated as C = 2πr or C = πd.
A number that indicates how many times a base number is multiplied by itself (e.g., 2³ = 2×2×2 = 8).
The product of all positive integers up to n, written as n! (e.g., 5! = 5×4×3×2×1 = 120).
A number representing a part of a whole, written as a numerator over a denominator.
The inverse of exponentiation — the logarithm of a number tells you the exponent needed to produce that number from a given base.
A rectangular array of numbers arranged in rows and columns, used in linear algebra, computer graphics, and data science.
Three measures of central tendency used to describe the center of a data set.
A number expressed as a fraction of 100, used to describe proportions and rates of change.
Methods of counting arrangements: permutations count ordered arrangements, combinations count unordered selections.
The mathematical constant representing the ratio of a circle's circumference to its diameter, approximately 3.14159.
A natural number greater than 1 that has no positive divisors other than 1 and itself.
A measure of how likely an event is to occur, expressed as a number between 0 (impossible) and 1 (certain).
A fundamental relation in geometry: the square of the hypotenuse equals the sum of squares of the other two sides.
A second-degree polynomial equation of the form ax² + bx + c = 0, where a ≠ 0.
A measure of the spread or dispersion of a data set from its mean (average).
The amount of three-dimensional space enclosed by a surface, measured in cubic units.
A unit of heat energy equal to the amount needed to raise one pound of water by one degree Fahrenheit.
The time required for half of a radioactive substance to decay, or more generally, for a quantity to reduce to half its initial value.
A unit of energy equal to using 1,000 watts of power for one hour.
The energy an object possesses due to its motion, calculated as KE = ½mv².
The mass of one mole (6.022×10²³ particles) of a substance, expressed in grams per mole (g/mol).
The relationship between voltage, current, and resistance in an electrical circuit: V = I × R.
The stored energy an object has due to its position or state, such as gravitational potential energy (PE = mgh).
Force applied per unit area, measured in pascals (Pa), psi, atm, or bar.
A dimensionless quantity that predicts whether fluid flow will be laminar (smooth) or turbulent.
The amount of heat energy required to raise the temperature of one unit mass of a substance by one degree.
Stress is the internal force per unit area in a material; strain is the resulting deformation (change in shape or size).
A material property that measures how well it conducts heat, expressed in watts per meter-kelvin (W/m·K).
A rotational force that causes an object to rotate around an axis, measured in newton-meters or foot-pounds.
Wavelength is the distance between successive wave peaks; frequency is the number of complete wave cycles per second.
A unit of lumber volume equal to a piece 1 foot long, 1 foot wide, and 1 inch thick (144 cubic inches).
The amount of concrete needed for a project, typically measured in cubic yards or cubic meters.
A construction panel made of gypsum plaster pressed between two sheets of paper, used for interior walls and ceilings.
The total volume of earth to be removed from a site, calculated from dimensions and depth of the dig.
Temporary molds or frames used to hold wet concrete in shape until it hardens to the desired form.
The lowest structural element of a building that transfers loads from the structure to the ground.
A paste of cement, sand, and water used to bind bricks, blocks, or stones in masonry construction.
Steel bars embedded in concrete to increase tensile strength, since concrete is strong in compression but weak in tension.
A structure designed to hold back soil at different elevations, preventing erosion and landslides.
A unit of measurement equal to 100 square feet, used in the roofing industry to estimate materials.
The process of mechanically densifying soil to increase its strength and reduce future settling.
A measurement of area in square feet, commonly used for rooms, homes, and land in the United States.
Rise is the vertical height of each stair step; run is the horizontal depth. Together they determine stair comfort and safety.
Standardized volume and weight units used in recipes, including teaspoons, tablespoons, cups, ounces, and grams.
The surface material used to create outdoor decks, available in wood (pressure-treated, cedar, redwood) or composite materials.
A measure of how far a vehicle can travel on a unit of fuel, typically expressed as miles per gallon (MPG) or liters per 100 km.
Small stones and rock fragments used for driveways, drainage, landscaping, and construction bases.
A six-character alphanumeric code representing a color in RGB format, widely used in web design.
A layer of material (wood chips, bark, straw, or rubber) spread over soil to retain moisture, suppress weeds, and regulate temperature.
A numerical system indicating footwear size, varying by country (US, UK, EU, CM/JP) with no universal standard.
A geographic region that observes a uniform standard time, typically offset from UTC (Coordinated Universal Time).
An optional payment given to service workers (servers, bartenders, delivery drivers) as thanks for good service, typically 15–25% of the bill.
The number of seconds elapsed since January 1, 1970 (Unix epoch), used universally in computing.