For volunteer HOA & condo boards
HOA Reserve Fund Calculator & Planning Tool
Estimate your recommended annual reserve contribution, monthly per-unit amount, percent funded, and a simple 10–30 year reserve plan. Add your major components for a standards-based estimate, then export the plan to CSV.
Planning tool only. Not a formal reserve study or legal advice.
Reserve fund calculator
Results update as you type. No signup.
Your association
Quick estimate, Use this when you only know your budget, reserve balance, and unit count.
Your 30-year reserve plan
See your reserve trajectory
Add your major components to see your 30-year reserve trajectory
Enter roofs, paving, and other big-ticket components to plot your projected balance against the fully-funded benchmark.
Understanding reserves
What is an HOA reserve fund?
Your reserve fund is the part of your association’s finances set aside for major common-area repair and replacement costs, things like roofs, paving, exterior paint, elevators, HVAC, or pool resurfacing. It is different from your operating budget, which covers routine yearly expenses.
How percent funded works
Percent funded compares your current reserve balance to your fully funded balance, the amount your association would ideally have saved based on the age and replacement cost of its components. A higher percentage usually means lower risk of cash-flow trouble, but it is still only one planning indicator.
What this calculator does
This tool helps volunteer boards estimate reserve contributions, compare current reserves to a fully funded benchmark, and see a simple multi-year plan.
What this calculator does not do
It does not inspect the property, perform engineering analysis, verify hidden conditions, review structural safety, or replace a formal reserve study.
When to bring in a pro
Calculator vs. formal reserve study
Use this planning tool when you need a practical starting point for budgeting, board discussion, or owner communication. Bring in a credentialed reserve professional when your community has complex assets, deferred maintenance, structural or safety concerns, major projects due now, lender review questions, or state-law requirements.
Who to look for
CAI’s Reserve Specialist (RS) designation is built for reserve-study work. APRA’s Professional Reserve Analyst (PRA) credential requires significant full-time reserve-study experience and site-inspection studies.
State requirements vary
Reserve-study and reserve-funding rules can differ significantly by state, by community type, and by your governing documents. Review your state law, your declaration/bylaws, and your most recent reserve study before adopting a reserve budget.
Bring in a reserve professional if…
- your community has multiple buildings or complex systems;
- a major project is already due;
- you suspect deferred maintenance or hidden deterioration;
- structural or safety questions are involved;
- your state law or lender review requires more than a planning estimate.
Lender readiness
A healthier reserve plan also helps with lender questionnaires
Better reserve planning can make it easier for your association to answer condo lender questionnaires and project reviews. Fannie Mae’s 2026 condo-project updates retire Limited Review for loan applications dated on or after August 3, 2026, prohibit baseline funding when lenders use a reserve study to demonstrate sufficient reserves on that path, and raise the minimum budget reserve allocation from 10% to 15% for Full Review applications dated on or after January 4, 2027.
Check your condo’s warrantabilityKeep your plan
Plan early. Revisit it yearly.
Export your plan today, then keep it updated in thorpia as your reserves and components change. We’re building the US product now.
Frequently Asked Questions
Common questions about reserve fund planning and this calculator.
The reserve fund ratio measures how prepared your HOA is for future capital expenses. Calculate it as: (Current Reserve Balance ÷ Fully Funded Balance) × 100. For example, $30,000 in reserves with a $50,000 fully funded balance means you are 60% funded. Most reserve study professionals recommend a minimum of 70% funded. Below 30% is considered critically underfunded and may require a special assessment.