Database & Backend Platform · decision tool

What Firebase really costs at your usage

Firebase priced at YOUR usage from verified pricing pages — 1GiB Firestore, 50K reads / 20K writes / 20K deletes per day, 50K auth MAU, 10GiB egress. See the free-tier ceiling, the per-unit overage, and exactly when it starts costing real money.

Prices verified 2026-07-15 against official pricing pages · fit weights are our estimates (see methodology) · share the URL to share your configuration

As of Jul 2026, with 150,000 monthly active users, 15 GB database size, 120 GB monthly egress, 3,000 db operations per user / month, 24 compute active hours / day, a $50 budget for this slot, Firebase (Firestore) ranks first for these inputs at 42% fit and a StackSays-estimated $394.90/month. Fit weights are our estimates; prices trace to official pages. Change any input below and the verdict recomputes.

Your situation

The verdict updates as you move these.

Monthly active userspeople actually hitting the app each monthDatabase size (GB)rows + indexes; a typical early SaaS is 1–10GBMonthly egress (GB)data served out of the DB/API to clientsDB operations per user / month≈100 light · 1,000 normal · 10,000 heavy — only per-operation DBs (Firestore) bill thisBudget for this slot ($/mo)what you'd accept paying for the database layerTeam size1 = solo; bundled platforms save glue time for small teams

Clear pick for your inputs

Firebase (Firestore)fit 42% · est $394.90/mo

Google's document database with realtime sync and a huge mobile ecosystem

Firebase (Firestore)fit 42%

$394.90/mo

Comparing 1 tools head-to-head. Open the full field (7 options) →

The decision, in plain words

For a solo builder at 150,000 monthly active users and a $50.00/mo budget for the database slot, Firebase (Firestore) leads at 42% fit and $394.90/mo. The two rules doing the work: batteries included (Bundles auth, file storage, realtime — fewer services to glue at team size 1); ecosystem maturity (established — our estimate from ecosystem age, docs and hiring pool).

Honest weak spot of the pick: ~$394.9/mo is 790% of your $50/mo budget — over it.

Generated from the calculation above — every number traces to the sourced data; nothing here is written by an AI making things up.

Why Firebase (Firestore) scores 42%

Budget fit (weight 30, our estimate) — ~$394.9/mo is 790% of your $50/mo budget — over it-30

Batteries included (weight 12, our estimate) — Bundles auth, file storage, realtime — fewer services to glue at team size 1+12

Exit cost (weight 4, our estimate) — Proprietary data model — leaving means rewriting the data layer-4

Ecosystem maturity (weight 8, our estimate) — established — our estimate from ecosystem age, docs and hiring pool+8

Free-tier runway (weight 10, our estimate) — Free tier exists (1GiB Firestore, 50K reads / 20K writes / 20K deletes per day, 50K auth MAU, 10GiB egress) — a cheap staging/dev lane even after you outgrow it+4

Total (lines sum exactly)-10

Possible range −64…+64 (sum of active rule weights) · fit % = (total + max) / (2 × max)(-10 + 64) / 128 = 42%

How the $394.90/mo estimate is calculated

Database storage overage — 14GB over 1GB included × $0.18/GB$2.52

Egress overage — 109.2GB over 10.8GB included × $0.15/GB$16.38

Document reads overage — 358.48M over 1.52M included × $0.6/M$215.09

Document writes overage — 89.39M over 0.608M included × $1.8/M$160.91

Note — Firestore nam5 rates: $0.06/100K reads, $0.18/100K writes, $0.18/GiB storage; deletes ($0.02/100K) not modeled. Ops derived from your per-user activity input (80/20 read/write split, our estimate)$0

Monthly total (lines sum exactly)$394.90

What could change this verdict

No single input change within the tested range changes the winner.

Cost risk

Estimated now (StackSays estimate, not your final bill)$394.90/mo · Blaze (pay-as-you-go)

Free-tier statusFree tier exceeded (database storage 15GB > 1GB cap)

Biggest unpriced/uncertain variableFirestore nam5 rates: $0.06/100K reads, $0.18/100K writes, $0.18/GiB storage; deletes ($0.02/100K) not modeled. Ops derived from your per-user activity input (80/20 read/write split, our estimate)

Official prices verified 2026-07-15; calculation is deterministic code over those prices.

At a glance

Tool	Free tier	Paid entry	Verified
Firebase (Firestore)	1GiB Firestore, 50K reads / 20K writes / 20K deletes per day, 50K auth MAU, 10GiB egress	Pay-as-you-go — Firestore nam5 rates: $0.06/100K reads, $0.18/100K writes, $0.18/GiB storage; deletes ($0.02/100K) not modeled. Ops derived from your per-user activity input (80/20 read/write split, our estimate)	2026-07-15

Where did you land?anonymous, one click

Data sources

Tool	Source	Verified
Firebase (Firestore)	Firebase pricing page	2026-07-15

A monitor re-checks these pages for changes; when a vendor moves a price, the date updates and every verdict recomputes.

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