Rate

Rate or rates may be:

 Rate (mathematics), a specific kind of ratio, in which two measurements are related to each other
 Rate of travel, or velocity
 Naval rating or rate, terms used to designate specialty or seniority of enlisted naval personnel.
 Rate of a ship, a term for a sail ship's firepower in the British Royal Navy
 Bit rate, number of bits that are processed per unit of time
 Rates, a Portuguese parish and town located in the municipality of Póvoa de Varzim
 Rates (tax) a type of property tax  in the United Kingdom

In science and finance
 Rate function, a function used to put a number to the probabilities of a rare event
 Rates (tax), a type of taxation system used to fund local government
 Reaction rate  in Chemistry
 Exchange rate, how much one currency is worth in terms of the other

In human growth
 Birth rate, the childbirths per 1,000 people per year
 Mortality rate, a measure of the number of deaths in some population

As an initialism
 Radioisotopes and the Age of the Earth, a project of creation geophysics