Finnish is famous for its cases, and the number quoted — around fifteen — sounds intimidating until you see them laid out together. This page does exactly that: it shows all fifteen as one system, built from a single word, talo ("house"), so you can watch the endings stack onto one stem. The goal here is orientation, not mastery. Each case gets its own page for the details; this is the map you'll come back to. Treat it as the table of contents for the whole Cases chapter.
The four families
The fifteen cases fall into four natural groups. Learn the groups and the system stops feeling like a random list:
- Grammatical (4): nominative, genitive, partitive, accusative — the cases that mark who does what to whom.
- Interior locative (3): inessive, elative, illative — in, out of, into an enclosed space.
- Exterior locative (3): adessive, ablative, allative — on/at, from, onto/to a surface or person.
- Marginal (5): essive, translative, abessive, comitative, instructive — specialized meanings, some rare in speech.
The whole paradigm on one word
Here is talo in all fifteen cases (singular). Read down the "ending" column and you'll see the logic: everything after the stem talo- is an added suffix.
| Group | Case | talo form | Ending | Rough gloss |
|---|---|---|---|---|
| Grammatical | Nominative | talo | — | house (subject) |
| Genitive | talon | -n | of the house | |
| Partitive | taloa | -a / -ä | (some) house | |
| Accusative | talo / talon | — / -n | house (whole object) | |
| Interior locative | Inessive | talossa | -ssa / -ssä | in the house |
| Elative | talosta | -sta / -stä | out of the house | |
| Illative | taloon | -Vn | into the house | |
| Exterior locative | Adessive | talolla | -lla / -llä | at / on the house |
| Ablative | talolta | -lta / -ltä | from the house | |
| Allative | talolle | -lle | onto / to the house | |
| Marginal | Essive | talona | -na / -nä | as a house |
| Translative | taloksi | -ksi | into (becoming) a house | |
| Abessive | talotta | -tta / -ttä | without a house | |
| Comitative | taloineen | -ine- + poss. | with its houses | |
| Instructive | taloin | -in | by means of houses |
The grammatical four
These mark grammatical roles. The nominative is the subject; the genitive shows possession (and doubles as the whole-object shape); the partitive marks partial or ongoing objects and amounts; the accusative marks a complete object and, for nouns, simply borrows the nominative or genitive shape (only personal pronouns have a distinct accusative, minut, hänet).
Naapurin talo on myynnissä.
The neighbor's house is for sale.
Ostin talon viime keväänä.
I bought the house last spring.
The nominative and partitive each have their own page; the partitive in particular does a great deal of work.
The six locative cases
Finnish splits location into an interior series (things inside a space) and an exterior series (things on a surface or associated with a person). Each series has three members — a place, a source, and a goal — giving the famous six-way locative grid.
Talossa on kolme huonetta ja pieni sauna.
There are three rooms and a small sauna in the house.
Tulen kohta talosta ulos, odota hetki.
I'll come out of the house in a moment, wait a second.
Juostiin taloon, kun alkoi sataa.
We ran into the house when it started to rain.
Odotan sinua talolla kello viisi.
I'll wait for you at the house at five o'clock.
Kävelin talolta suoraan asemalle.
I walked from the house straight to the station.
The interior-versus-exterior choice is one of the first real decisions Finnish forces on you; it has its own interior vs exterior page.
The five marginal cases
These are specialized. The essive ("as, in the role of") and translative ("becoming, into") are alive and common; the abessive ("without"), comitative ("together with"), and instructive ("by means of") are largely (formal) or (literary), replaced in everyday speech by ilman + partitive, kanssa, and ordinary phrases.
Vanha varasto muutettiin taloksi muutamassa kuukaudessa.
The old warehouse was turned into a house in a few months.
Rakennus toimi ennen kouluna, nyt se on museo.
The building used to serve as a school; now it's a museum.
Two things every ending does
Two processes run across the entire table, so build them into your expectations now.
Vowel harmony. Every ending with an a/o/u has a front twin with ä/ö/y. Talo (back) takes -ssa, but kylä (front) takes -ssä: talossa but kylässä. See vowel harmony.
Gradation. Attaching an ending can change a k/p/t in the stem. Katto ("roof") has a strong tt, but in the genitive it weakens: katon. So the endings are regular, but the stem underneath may shift.
Katon reunalla istui kissa ja katseli pihalle.
A cat sat on the edge of the roof, watching the yard.
Kylässä on vain yksi kauppa ja pieni koulu.
There's only one shop and a small school in the village.
Common Mistakes
❌ Asun talo.
Incorrect — 'in the house' needs the inessive ending: talossa.
✅ Asun talossa.
I live in the house.
❌ Menen talolle sisään sateen takia.
Incorrect — 'into' an enclosed space is the illative taloon, not the exterior talolle.
✅ Menen taloon sateen takia.
I'm going into the house because of the rain.
❌ Kissa istuu kattossa.
Incorrect — 'on the roof' is the adessive katolla, and katto gradates to kato-.
✅ Kissa istuu katolla.
The cat is sitting on the roof.
❌ Asun kylässa.
Incorrect — kylä is a front-vowel word, so the inessive ending is -ssä: kylässä.
✅ Asun kylässä.
I live in the village.
Key Takeaways
- Finnish has about fifteen cases in four families: grammatical, interior locative, exterior locative, marginal.
- Every case is a suffix on one stem — talo- never changes across the whole paradigm.
- The locative six split in/out/into (interior -ssa/-sta/-Vn) from on/from/onto (exterior -lla/-lta/-lle).
- The marginal five are specialized and often replaced in speech by prepositional phrases.
- Every ending harmonizes (talossa vs kylässä) and can trigger gradation (katto → katon).
Now practice Finnish
Reading grammar gets you part of the way. The exercises are where it sticks — free, no signup needed.
Start learning Finnish→Related Topics
- What Cases Replace: English PrepositionsA1 — The mental shift for English speakers: a case ending does the job of a preposition or possessive 's, and Finnish splits 'to' and 'from' in two.
- Nominative: Subject and Basic PredicateA1 — The endingless nominative marks the subject and the predicate noun after olla — and, surprisingly, the total object after imperatives, passives and necessives.
- The Partitive: Finland's Most Important CaseA1 — The partitive marks unbounded quantity and unfinished events — after numbers, under negation, with mass nouns, and as a partial object; the hub for the whole partitive.
- Interior vs Exterior: -ssa vs -llaA2 — Finnish has six local cases in a 3×2 grid — interior (in/out-of/into) vs exterior (on/off/onto) — and the choice hinges on whether a place is enclosed or open.