APR
Annual Percentage Rate. A yearly rate used to describe borrowing cost. Calculator payment formulas may use APR as a periodic interest rate.
TutorCalc Glossary
Plain-English definitions for terms that appear across TutorCalc calculators.
Amortization
The process of paying a loan down through scheduled payments that include principal and interest.
Debt-to-Income (DTI)
Recurring monthly debt payments divided by gross monthly income, usually expressed as a percentage.
Equity
The value remaining after subtracting an associated debt or liability from an asset's estimated value.
PUE
Power Usage Effectiveness: total data center facility energy divided by IT equipment energy.
Optical Loss Budget
The amount of signal loss a fiber link can tolerate while still meeting the optical requirements of the transceivers and design.
Contribution Margin
Selling price per unit minus variable cost per unit. It indicates how much each unit contributes toward fixed costs and profit.
Net Worth
Total assets minus total liabilities at a point in time.
Resale Value
An estimate of what an asset may be worth when sold at a future point in time.
Token
A unit used by many AI systems to process text or other content. API pricing may distinguish input and output tokens.