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Reserve Burn Rate Calculator

Reserve burn measures capex runway. This calculator reveals months of coverage.

Current reserve

YTD capex deployed

Months elapsed

Contracted remaining

Burn months remaining

1 yr

Monthly burn

$16,000

Effective reserve

$193,000

How the math works

Burn = YTD capex ÷ months elapsed. Effective reserve = balance − contracted. Months remaining = effective ÷ burn.

Recalculate burn against the trailing 12 months rather than YTD. Early-year projects skew YTD metrics high (work orders pile up in Q1-Q2); trailing-12 captures real deployment pace across seasonality.

Editorial noteMaintained by EveryCalc - Reviewed June 2026

EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.

Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.

Learn more about our review process on the EveryCalc methodology page.

How this calculator works

What this page estimates

This Reserve Burn Rate Calculator is built to give a quick, browser-based estimate for reserve burn rate. Reserve burn measures capex runway. This calculator reveals months of coverage. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.

Calculation approach

The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.

Example workflow

For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.

Practical checks

Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
Run a low, base, and high case when the inputs are estimates.
Check the related calculators below when the next decision depends on a different assumption.

How to interpret the reserve burn rate result

Best use

Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.

Cross-check

Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.

Watch for

Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.

This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.

Before relying on this reserve burn rate estimate

Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.

Confirm source numbers

Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.

Separate cash flow from total cost

A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.

Run conservative cases

Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.

Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.

How to Use

Enter current reserve balance.
Enter YTD capex deployed.
Enter months elapsed.
Enter contracted remaining capex.
Read burn months remaining.

Frequently Asked Questions

Interpretation?

6+ months = healthy. 3-6 months = watch. <3 months = urgent capital call or contribution increase. Trailing 12 months best view (smooths seasonality); YTD can be noisy in Q1.

Contracted vs discretionary?

Contracted capex (signed with GC) must be paid. Discretionary (planned but uncontracted) can be deferred. Separate the two to know actual runway vs wishlist runway — very different numbers.

Recovery mechanism?

Annual reserve contribution increase (cleanest). Owner capital call (HOA/MF syndication). Capex loan (bridges to refi). Sell off underperformer (portfolio-level). Each has cost; most expensive path is emergency funding after reserves hit zero.

How does this interact with the rest of the capital stack?

Each tier of the stack affects the next. Senior debt constrains LTC and DSCR. Mezz and pref consume equity spread. Interest rate hedges protect DSCR but cost premium. Always model the full stack holistically — optimizing one tier alone often degrades another. Institutional underwriters run three or four scenarios across the stack before committing capital.