BuildCity.io

Planning Tool

Diagnose your next BuildCity expansion before spending money

Enter your current city numbers to find the strongest bottleneck, choose a practical build order, and estimate how much of your budget should go to utilities, services, roads, or growth.

City inputs

The planner runs locally in your browser. It does not read your account or save these values.

Money you can spend after collecting idle taxes.
Use the income shown by the game, not projected income.
Helps estimate whether services or growth buildings matter more.
The result changes based on what you are trying to unlock.
Percent capacity left after current demand. Negative means shortage.
Percent capacity left before water limits the next district.
Low sewage headroom is a common hidden expansion blocker.
Approximate percent of active districts connected by usable roads.
Use the weakest district, not the best-covered one.
Safety gaps reduce stability as population grows.
Hospitals matter more once density rises.
Education supports stronger long-term value and unlock readiness.
Useful for happiness, land value, and tax efficiency.
Low happiness usually means the next expansion should wait.
Higher value improves tax output from the same population.
How many hours of tax income you usually collect at once.

Expansion diagnosis

Results update when you run the diagnosis. The score favors stable growth over fast but fragile expansion.

0
Not calculated

Use the form to generate a city-specific plan.

Weakest system -
Estimated idle collection -
Service average -
Utility average -

Recommended build order

Budget split

Utilities reserve
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Public services
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Roads and access
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New growth
-

How to use the diagnosis

The tool is designed for practical BuildCity decisions. It does not try to guess the whole map. Instead, it checks the same bottlenecks that usually stop growth: utilities, roads, public services, happiness, land value, and cash flow.

Use conservative inputs. If one neighborhood has weak police coverage, enter that weak value instead of the city average. A city grows from its worst bottleneck, not from its best screenshot.

Fix shortages before expansion Negative or low utility headroom should be solved before opening more residential land.
Service coverage beats random roads More roads do not help if the new district lacks safety, health, and basic access.
Land value improves tax quality Parks, schools, hospitals, and clean planning can make existing population more profitable.
Keep a reserve Spend enough to remove the bottleneck, but keep money available for the next shortage.

Common planning questions

Why does the planner prioritize utilities first?

In BuildCity, unsupported land cannot grow reliably. A new district with roads but weak power, water, or sewage support often creates empty buildings or stalled settlement.

When should I build more roads?

Build roads when they connect a planned district to utilities and services. Roads built far ahead of demand spend money without increasing tax income.

What service coverage should I aim for?

For a stable growing district, keep fire, police, and health coverage above 70 percent before pushing density. Education and parks can follow, but they are important for stronger land value.

Why is land value separate from happiness?

Happiness helps keep citizens stable. Land value improves the long-term quality of tax income. A city can feel stable but still earn poorly if land value is ignored.

Can this tool replace in-game judgment?

No. It is a planning aid. Use it to choose the next action, then confirm the result by checking the actual city after the build finishes.

Does this page collect personal information?

No. The calculator works in the browser and does not submit your city values to the server. For account and privacy details, read the Privacy Policy.