Depreciation Ross-Heidecke
Compute the depreciation coefficient of improvements by combining age depreciation (Ross) with conservation state (Heidecke). The same formula as Valora's evolutionary method — with a reference table.
Depreciation coefficient (K)
12.0%
Age depreciation (Ross)
9.7%
Residual factor
88.0%
Consumed life
16.7%
K = K_ross + Ec · (1 − K_ross), where K_ross = (t + t²)/2 and t = age/useful life.
FAQ
How does the Ross-Heidecke method work?
It combines Ross depreciation — a function of consumed life, K_ross = (t + t²)/2 — with a Heidecke coefficient penalizing conservation state. The result K_rh is the improvement's depreciation percentage.
What are states A to H?
They are Heidecke's conservation scale, from 'new' (A, no penalty) to 'very poor' (H). Each state has a coefficient that increases depreciation over the portion not yet depreciated by age.
Does this match Valora's report?
Yes. This calculator's formula is identical to Valora's evolutionary engine, so the coefficient here is the same one applied when generating the report.
Educational support tool. It does not replace the qualified professional's judgment nor the full analysis required by NBR 14653. Results are computed from the data you provide.
Other free tools
IBGE · census tract
Income by location (IBGE)
Enter a ZIP (CEP) or address and see the average and median income of the IBGE census tract — the same socioeconomic variable Valora uses to enrich samples.
NBR 14653-2 · regression
NBR 14653-2 grounding degree
Find the degree (I, II or III) your regression model reaches and how many market data points each degree requires. Based on Table 1 of the standard.
This is just a sample of what Valora automates.
Automated market research, bulk IBGE enrichment, AI-assisted regression and an NBR 14653-compliant report — from property to PDF. Create your account and run a full appraisal.