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Calculate ROI percentage from gain and cost.
Quick answer: ROI Calculator
ROI = ((Gain - Cost) / Cost) x 100. Use net gain, not gross revenue, when you want the return percentage to reflect actual profit.
Example: Investing GBP 5,000 and receiving GBP 6,500 back creates GBP 1,500 net gain, which equals 30% ROI.
Calculations follow the documented formula on this page; rounding and input units can change the last digit-treat outputs as educational estimates unless you reconcile with source systems.
* This is an estimate. Actual amounts may vary slightly based on input assumptions.
Time horizon matters: 40% ROI in 3 months beats 40% over a decade. Annualize if you’re comparing strategies with different lengths.
Calculate ROI percentage from gain and cost.
Inputs on this page: Gain, Cost. Assumptions stay visible so you can reproduce the figure elsewhere.
Long-form walkthroughs that pair well with this calculator. When you need narrative context beyond the live fields, start here and return to the tool to plug in your own numbers.
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Read guide →Marketers use this for campaign returns, founders use it for software purchases, investors use it for simple project comparisons, and managers use it in budget proposals. It works best when the cost and gain definitions are agreed before the percentage is quoted.
Continue in the Business category hub, the Business & SaaS tools collection, or the glossary. Related calculators in this session: Break-even Calculator, Profit Margin Calculator, CAC Calculator SaaS, LTV Calculator SaaS, Break-even Calculator Business, Profit Margin Calculator Business.
The Formula
ROI% = (Gain / Cost) × 100| This tool | ROI% = (Gain / Cost) × 100 |
|---|---|
| Related intent: roi calculator | See paired tools for roi calculator-each page documents its own core relationship next to the live form. |
Core relationship for ROI Calculator:
ROI% = (Gain / Cost) × 100
Worked check: Spend $18k on equipment, net $26.5k benefit → gain $8.5k → ROI ≈ 47.2% on that cash.
Keep the same assumptions and open a neighbor calculator when your question branches: Break-even Calculator, Profit Margin Calculator, CAC Calculator SaaS, LTV Calculator SaaS. Each page documents its own formula beside the fields.
Learning links: Methodology · Editorial policy · Glossary
Investing GBP 5,000 and receiving GBP 6,500 back creates GBP 1,500 net gain, which equals 30% ROI.
Re-enter the same numbers in the calculator above to confirm the page math matches the interactive result.
Marketers use this for campaign returns, founders use it for software purchases, investors use it for simple project comparisons, and managers use it in budget proposals. It works best when the cost and gain definitions are agreed before the percentage is quoted.
Instant response
Run ROI Calculator in the browser and read the breakdown beside the form.
Transparent formula
The formula and worked example on this page match what the calculator uses.
Privacy friendly
No account required; inputs stay in your session unless you choose to share them.
Cross-device ready
Layout works on mobile, tablet, and desktop for the same field labels.
Official references for context. Calculator outputs are planning estimates—confirm material decisions with the primary authority or a qualified professional. See our methodology and editorial policy.
Reviewed July 18, 2026 · Content stamp 2026-07-18
Click a question to expand the answer.
Yes, the ROI Calculator is completely free with no hidden limits. For ROI Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is ROI% = (Gain / Cost) × 100, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final roi calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Yes. All tools are optimized for desktop, tablet, and mobile devices. For ROI Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is ROI% = (Gain / Cost) × 100, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final roi calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Return on investment = (gain − cost) ÷ cost, expressed as percent for easy comparison. For ROI Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is ROI% = (Gain / Cost) × 100, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final roi calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Spend $18k on equipment, net $26.5k benefit → gain $8.5k → ROI ≈ 47.2% on that cash. For ROI Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is ROI% = (Gain / Cost) × 100, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final roi calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Sunk costs aren’t in forward ROI - decide on marginal dollars. Opportunity cost of capital should be your hurdle rate, not 0%. Taxes on gains belong in the numerator if comparing after-tax life. For ROI Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is ROI% = (Gain / Cost) × 100, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final roi calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
No. Use it as a transparent planning check, then verify critical outcomes in your own systems or with a qualified professional when stakes are high. For ROI Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is ROI% = (Gain / Cost) × 100, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final roi calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Compare units, rounding, compounding, and tax basis side by side. This page documents: ROI% = (Gain / Cost) × 100 For ROI Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is ROI% = (Gain / Cost) × 100, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final roi calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
Time horizon matters: 40% ROI in 3 months beats 40% over a decade. Annualize if you’re comparing strategies with different lengths. Formula reference: ROI% = (Gain / Cost) × 100 For ROI Calculator, keep the inputs you used beside the result so the number can be checked later. The documented formula is ROI% = (Gain / Cost) × 100, and small changes to rates, rounding, dates, tax rules, regional assumptions, or percentage bases can change the final roi calculator result. Treat the output as a planning reference and confirm high-stakes decisions against official guidance or source systems.
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Reviewed by Toollabz Editorial
Product editor | Last reviewed July 18, 2026
See methodology and editorial policy.