| Subject | English | Icelandic |
| comp., MS | fixed asset | eign (An accounting classifier used to classify any long-term asset whose cost expiration is recognized over more than one year) |
| comp., MS | fixed asset group | eignaflokkur (A set of characteristics that are assigned to a fixed asset. The fixed asset inherits the characteristics (such as type, number sequences, and default value models) from the group) |
| math. | fixed base index | föstu grunngildi vísitölu |
| comp., MS | fixed compensation | föst laun (Compensation, independent of performance, that is awarded to an employee by an organization) |
| comp., MS | fixed compensation plan | launafyrirkomulag fastra launa (A compensation structure that is used to determine fixed compensation levels (bands, grades, or steps) and the compensation ranges associated with each level. This plan is often used for employees of the same employee type that are within a specific geographical area) |
| comp., MS | fixed cost | fastur kostnaður (A cost that does not vary with changes in product delivery throughput or output) |
| stat. | fixed effects constants model | bundið líkan |
| stat. | fixed effects constants model | líkan með bundnum hrifum |
| math. | fixed effects constants model | bundið líkan |
| math. | fixed effects constants model | líkan með bundnum hrifum |
| comp., MS | fixed exchange rate | fast gengi (An exchange rate that pegs one currency's value to another currency's value) |
| comp., MS | fixed percentage allocation method | úthlutunaraðferðin Samningsframvinda (A method for calculating allocations based on a specified percentage) |
| comp., MS | fixed-price project | verkefni á föstu verði, fastverðsverk (A type of project in which the customer pays a predetermined amount for the entire project) |
| comp., MS | fixed-price project estimate | mat fastverðsverks (The estimated total cost to complete a fixed-price project) |
| comp., MS | fixed quantity kanban | kanban í föstu magni (A type of kanban that is used when the number of kanbans that are assigned to a kanban rule is constant) |
| comp., MS | fixed-rate agreement | fastgengissamningur (An exchange rate that is frozen for the entire project period) |
| math. | fixed sample | föstum sýnishorn |
| math. | fixed variable | skýribreyta |
| math. | fixed variable | óháð breyta |
| math. | fixed variable | frumbreyta |
| math. | fixed variable | forsagnarbreyta |
| math. | fixed variable | hjábreyta |
| comp., MS | fixed weight allocation method | úthlutunaraðferðin Föst þyngd (A method for calculating allocations by using weighted values) |
| comp., MS | intangible fixed asset | óefnisleg eign (A non-physical fixed asset that a company uses to conduct its business) |