THE NUMORIX GUIDE
How to use the ROIC Calculator
Last reviewed September 14, 2026
What this calculator does
The engine calculates net operating profit after tax as NOPAT = netOperatingProfit x (1 - taxRate/100).
Formula and method
The engine calculates net operating profit after tax as NOPAT = netOperatingProfit x (1 - taxRate/100). ROIC is NOPAT divided by total invested capital times 100. It therefore measures the return on the entered capital base after the simple tax adjustment, not the return on the owner's equity alone.
Variables and inputs
Enter net operating profit, total invested capital, and tax rate. Profit and capital are dollars; tax and ROIC are percentages. The engine returns NOPAT and ROIC, with a zero result when invested capital is not positive.
Worked example
With $50,000 net operating profit, $250,000 invested capital, and a 25% tax rate, NOPAT is 50,000 x (1 - 0.25) = $37,500. ROIC is 37,500 / 250,000 x 100 = 15%.
How to interpret the result
ROIC compares after-tax operating profit with the capital used to generate it. Compare it with a consistent cost-of-capital measure and use consistent accounting definitions for operating profit and invested capital; a high percentage alone does not prove that a project is valuable.
Common mistakes to avoid
Do not use net income if the intended numerator is operating profit after tax. Match the period of profit to the period of invested capital. Do not mix a tax rate applied to operating profit with a capital figure measured under a different accounting basis.
Assumptions and limitations
The route applies one tax percentage and does not adjust for interest, deferred taxes, goodwill, leases, operating leases, invested-capital averaging, or accounting classification. It is not a substitute for a company's financial statement analysis or a standardized research definition.