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Capex Per Unit Calculator

Capex per unit per year is the standard multifamily reserve benchmark. Class A new construction targets $200-300; Class B 10-25 years runs $300-500; Class C 25+ years often needs $500-1,000. Under-reserving inflates short-term NOI but creates large deferred maintenance liabilities. This calculator computes the reserve and benchmarks it against age-appropriate industry norms.

Reviewed byJulian Germanfor EveryCalcMethodology

Total units

Annual capex spend

Building age (years)

Capex reserve / unit / yr (target)

Industry typical

Capex / unit / yr

$650

Target total reserve

$42,000

Actual − target

$36,000

Age-adjusted benchmark / unit

$350

Industry typical for property age

How the math works

Capex per unit per year is the multifamily industry's standard reserve metric. Class A new build: $200-300/unit; Class B 10-25 years: $300-500/unit; Class C 25+ years: $500-1,000/unit. Underwrite at age-appropriate level — under-reserving inflates NOI temporarily but forces large catch-up spending later.

Lenders increasingly require physical reserve studies and impose minimum capex reserves at acquisition closing to protect collateral value.

Editorial noteReviewed by Julian German - Updated July 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 Capex Per Unit Calculator is built to give a quick, browser-based estimate for capex per unit. Capex per unit per year is the standard multifamily reserve benchmark. Class A new construction targets $200-300; Class B 10-25 years runs $300-500; Class C 25+ years often needs $500-1,000. Under-reserving inflates short-term NOI but creates large deferred maintenance liabilities. This calculator computes the reserve and benchmarks it against age-appropriate industry norms. 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 capex per unit 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 capex per unit 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 total units and annual capex spend.
Enter building age (years) and target capex reserve per unit per year.
Read per-unit capex, target total, and variance against age benchmark.

Frequently Asked Questions

What counts as capex vs maintenance?

Capex extends useful life or adds value (roof, HVAC, kitchen rehab); maintenance preserves current condition (paint, repair, cleaning). Cap rate underwriting deducts capex reserves; opex includes maintenance.

Lender minimum reserves?

Most institutional lenders require $250-400/unit/year reserves for stabilized assets. Bridge and value-add lenders often require front-funded reserves at closing.

Age-based benchmarks?

Under 10 yrs: $200-300; 10-25 yrs: $300-500; 25+ yrs: $500-1,000. Roof, plumbing, and electrical replacement cycles drive the curve.

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