Dictionary
Plain-English definitions of the finance, trading, SEO, developer, and health terms behind our tools. Every entry links to the calculator or generator that puts it to work — and the same definitions power the site's search, so you can find a tool even if you only know the concept.
59 terms and counting.
Finance
Average number of days to collect payment after a credit sale.
DPOAverage number of days a business takes to pay its suppliers.
NPVToday's value of a project's future cash flows minus its upfront cost.
ROIThe gain or loss on an investment relative to its cost.
Gross MarginPercentage of revenue left after subtracting direct costs of goods sold.
Break-even PointSales level at which total revenue exactly covers total costs.
Working CapitalCurrent assets minus current liabilities; short-term financial cushion.
MarkupAmount added to a product's cost to set its selling price.
EMIA fixed monthly payment that repays a loan over its term.
Compound InterestInterest earned on both the principal and previously accrued interest.
SIPInvesting a fixed amount into a fund at regular intervals.
SaaS & Startup Metrics
Average cost to acquire one new customer.
LTVTotal revenue a business expects from a customer over the relationship.
Churn RatePercentage of customers or revenue lost over a given period.
MRRPredictable subscription revenue a business earns each month.
ARRPredictable subscription revenue a business earns over a year.
Burn RateRate at which a company spends its cash reserves each month.
RunwayHow long a company can operate before it runs out of cash.
Net Promoter ScoreA customer loyalty metric based on likelihood to recommend.
Cohort RetentionHow many users from a starting group stay active over time.
Trading & Investing
The smallest standard price move in a currency pair.
LeverageUsing borrowed funds to control a position larger than your own capital.
Margin (Trading)The deposit a broker requires to open and hold a leveraged position.
DrawdownThe peak-to-trough decline of an account or investment.
Sharpe RatioA measure of return earned per unit of risk taken.
Black-ScholesA mathematical model for pricing European-style options.
Kelly CriterionA formula for the bet or position size that maximizes long-term growth.
Risk-Reward RatioHow much you risk on a trade compared with the potential gain.
Position SizingDeciding how large a trade to place based on your risk.
Dollar-Cost AveragingInvesting a fixed amount at regular intervals regardless of price.
Marketing
SEO
An HTML attribute telling Google which language/region a page targets.
Title TagThe HTML element that sets a page's clickable headline in search results.
Meta DescriptionA short HTML summary of a page shown beneath its title in search results.
Keyword DensityThe percentage of times a keyword appears relative to total word count.
CTR (Click-Through Rate)The share of people who click a result after seeing it in search.
SERPThe page of results a search engine returns for a query.
Anchor TextThe visible, clickable words that make up a hyperlink.
JSON-LD (Structured Data)A JSON format for adding structured data that search engines read.
Robots.txtA text file telling crawlers which parts of a site they may access.
XML SitemapAn XML file listing a site's URLs to help search engines crawl them.
Readability (Flesch-Kincaid)A measure of how easy text is to read, often via Flesch-Kincaid.
Developer
A way to encode binary data as plain ASCII text.
JWTA signed token that carries user or session claims between systems.
Regular Expression (Regex)A pattern language for finding and matching text.
Cron ExpressionA text schedule that tells a system when to run a task.
UUIDA 128-bit identifier that is practically guaranteed to be unique.
Hash (SHA/MD5)A fixed-length fingerprint computed from any data.