ROI Calculator
Measure return on investment as gain or loss versus cost, with percentage ROI and net profit. Runs locally in your browser. Free online tool — no sign-up.
Trust summary Engine tested · Specification checked · v1.1.0
- Input interpretation
- Enter values to calculate.
- Result
- —
- Model
- Profit and ROI percentage from investment cost and final value.
- Scope
- Fixed rates and terms as entered; no fees or taxes unless modeled.
- Verification
- Engine tested · Specification checked · v1.1.0
- Named expert review
- Optional · Not performed
- Specification basis
- SEC Investor.gov — return on investment as (gain − cost) / cost
- CFA / managerial finance — basic ROI identity for evaluating an investment outcome
Formulas
Core equations used by this calculator.
How to use
Enter the known values
Fill in each field with amounts and rates as labeled.
Calculate
Results update as you type; compare scenarios below when available.
Read the outputs
Check the result panel for the primary figure and supporting totals.
Example calculations
Common configurations with formula and result.
Worked example
Cost 10,000 · Gain 12,500 → profit 2,500 · ROI 25%
ROI calculator specification
Version 1.1.0 · Engine tested
- Engine tested 3 published cases
- Named expert review Not performed
- Calculation version 1.1.0
- Definition
- Return on investment (ROI) measures profit relative to cost: ROI = (gain − cost) / cost. Gain is the ending value or total proceeds from the investment.
- What it calculates
- Profit and ROI percentage from investment cost and final value.
- Inputs
- Values shown on the calculator form
- Outputs
- Primary result in the result panel
- Formula
ROI = (gain − cost) / cost- Assumptions
- Fixed rates and terms as entered; no fees or taxes unless modeled.
- Calculation runs locally in the browser.
- Units
- Currency units as entered (dimensionless rates in %)
- Boundary conditions
- Zero or missing required fields yield zero or empty results.
- Negative inputs are treated as zero.
- Example
- Cost 10,000 · Gain 12,500 → profit 2,500 · ROI 25%
- Validation cases
3 published on this page
- 10000 → 12500 → ROI 25%
- 10000 → 10000 → ROI 0%
- 8000 → 6000 → ROI −25%
- Specification basis
- SEC Investor.gov — return on investment as (gain − cost) / cost
- CFA / managerial finance — basic ROI identity for evaluating an investment outcome
- Calculation version
- 1.1.0
Background
Interpretation and common distinctions.
About this calculator
Return on investment (ROI) measures profit relative to cost: ROI = (gain − cost) / cost. Gain is the ending value or total proceeds from the investment.
Example
Cost 10,000 · Gain 12,500 → profit 2,500 · ROI 25%
Related tools
Other calculators in this family: Compound Interest, Simple Interest, ROI Calculator .
Frequently asked questions
Key distinctions behind the calculation.
How does the ROI Calculator work?
It uses ROI = (gain − cost) / cost. All math runs locally in your browser.
Can I share my inputs?
Yes. Use Copy link in the result panel — the URL stores your current inputs.