AtlasCalcsUtility Calculation Suite
2026-09-23 6 min read

Project IRR Calculator

Even-flow project IRR vs hurdle.

Calculator

Initial Investment
$
Annual Cash Flow
$
Number of Periods

Results

Optimal

IRR (per period)

21.41%

Live results update as you type — currently showing irr (per period) of 21.41%. Replace the defaults with your own numbers.

Visualizations

IRR

-100,000$Initial
25,000$Annual CF

Formula

Break-even discount rate.

Solve PV(CF) = initial for r

Variables

SymbolNameUnitDescription
CFCash flow$Annual

Explanation

Project yield vs hurdle.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Solve PV(CF) = initial for r (bisection)

Result: 21.41%
Final Answer
21.41%

Worked Examples

See how the calculator works with different scenarios.

Scenario

The project irr calculator run on the values above.

Inputs

initialCost:100000
cashFlow:25000
periods:10

Calculation

1. Solve PV(CF) = initial for r (bisection) → 21.41%

Result

IRR (per period): 21.41%

Interpretation

IRR 21.41% — compare to hurdle/WACC.

Understanding Your Result

Your Result: IRR (per period): 21.41%

What This Means

Project yield vs hurdle.

Why It Matters

IRR 21.41% — compare to hurdle/WACC.

Professional Interpretation

IRR 21.41% — compare to hurdle/WACC.

How this is calculated

Break-even discount rate.

What drives the result

Compounding grows lump sums and streams forward; discounting shrinks them back. The rate is the exchange rate between today and tomorrow.

Recommendations

  • •IRR > hurdle accepts; watch reinvestment assumption.
  • •Multiple sign changes can give multiple IRRs.

Educational Content

Introduction

Money has a time price: a dollar today compounds forward and discounts backward. Annuities package that into streams, NPV/IRR judge projects, and DCF prices whole firms.

Concept Explanation

Compounding grows lump sums and streams forward; discounting shrinks them back. The rate is the exchange rate between today and tomorrow.

Applications

▸Saving and loan decisions
▸Project screening with NPV/IRR
▸Firm valuation with DCF

Benefits

  • •Comparable across timing
  • •Rate-explicit decisions
  • •Value linked to cash, not accounting

Limitations

  • •Constant-rate simplifications
  • •Even-flow shortcuts where noted
  • •Forecasts dominate DCF truth

Best Practices

  • •Match rate frequency to cash frequency
  • •Show ranges for DCF/IRR
  • •Annualize before comparing

Common Misconceptions

Myth: Nominal equals effective
Truth: Compounding gaps them — use EAR.
Myth: IRR alone decides
Truth: Scale and timing need NPV beside it.

Practical Tips

  • •Watch reinvestment flaw.

Common Mistakes

Multiple IRRs
Sign changes cause it.

Assumptions

This calculator makes the following assumptions to provide estimates:

Even flows: Simplified.

Limitations

Be aware of these limitations when using this calculator:

Limitation: Constant-rate simplifications
Limitation: Even-flow shortcuts where noted
Limitation: Forecasts dominate DCF truth

Frequently Asked Questions

Answers to common questions about this calculator.

Vs hurdle?
Above accepts.
How accurate is the project irr calculator?
It follows the stated TVM formula from your inputs. Match rate frequency to cash frequency for exact results.
Ordinary vs due?
Ordinary pays at period-end; due pays at start and is worth (1+r) more.
Nominal vs effective?
Nominal ignores compounding; effective (EAR) includes it — compare EAR.

Related Guides

Deepen your understanding with these educational resources.

Glossary

Technical terms used in mortgage calculations explained in plain language.

IRR
Discount rate that makes NPV zero.

Authoritative References

Trusted sources and standards referenced by this calculator.

Applicable Standards

End-of-period (ordinary) timing unless labeled dueMoney rounded for display only; math at full precisionEven annual flows where labeled; uneven timing needs period detail

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Page Information

Last Updated:

2026-09-23

Version:

2.0.0

License:

Free to use for educational and professional purposes.