Marketing ROI Calculator
An interactive web tool that lets marketing teams input campaign costs and revenue data across channels, then instantly visualises ROI, ROAS, payback period, and budget reallocation recommendations.
Data Input
Marketing team enters spend and revenue figures for each active campaign channel into the calculator.
Instant Calculation
Alpine.js calculates ROI, ROAS, CPA, and payback period in real time as values are entered — no page reload needed.
Visual Comparison
Charts display channel-by-channel performance, highlighting top performers and underperforming budget allocations.
Save to Airtable
Results are saved to Airtable for historical tracking, trend analysis, and monthly report generation.
Monthly Report
Make generates and emails a formatted monthly performance summary with trends and recommended adjustments.
Project Scope & Capabilities
Multi-Channel ROI Calculator
Teams enter spend and revenue for each marketing channel; the tool instantly calculates ROI, ROAS, CPA, and payback period with visual comparison charts.
Budget Reallocation Suggestions
Based on channel performance data, the calculator surfaces actionable budget reallocation suggestions to maximise overall marketing ROI.
Automated Monthly Reports
A Make automation pulls the latest Airtable data each month and emails a formatted performance summary to the marketing team and management.
Implementation Timeline
| Phase | Duration | Description |
|---|---|---|
| Discovery & Design | Week 1 | Define tracked channels and metrics, design calculator UI and formula logic, set up Airtable schema, and design report template. |
| Build & Integration | Week 1-2 | Build Astro calculator with Alpine.js logic, Airtable save integration, Make monthly report automation, and email delivery. |
| Testing & Launch | Week 2 | Formula accuracy validation, Airtable sync testing, report generation review, and production launch. |
| Handover | Week 2 | Marketing team walkthrough, channel setup guide, monitoring, and documentation handover. |
Cost Analysis
Development
$2,200
Calculator UI, ROI formula logic, Airtable integration, Make monthly report automation, and email delivery.
Infrastructure
$30/mo
Airtable subscription, Make automation plan, and hosting.
Maintenance
$40/mo
New channel onboarding, formula updates, report template tweaks, and technical support.
Return on Investment
Instant
ROI Calculation Time
Teams see live ROI figures as they type — replacing hours of manual spreadsheet work each month.
100%
Formula Consistency
Standardised formulas eliminate inconsistencies between team members using different spreadsheet versions.
6 hrs/month
Reporting Time Saved
Automated monthly report replaces manual data gathering and formatting by the marketing manager.
+18% ROI
Budget Optimisation
Teams acting on reallocation suggestions achieve measurably higher blended marketing ROI within 90 days.
Testing & Quality Assurance
Automated Testing
- ✓ ROI and ROAS formulas validated against 30 manual reference calculations
- ✓ Airtable save reliability tested under concurrent multi-user input
- ✓ Make report generation accuracy verified for 6 months of historical data
- ✓ Cross-browser and mobile rendering tested across five environments
Manual Validation
- ✓ Marketing manager review of chart clarity and reallocation suggestions
- ✓ Formula logic sign-off by the CFO against existing spreadsheet model
- ✓ Monthly report layout and content approved by management
- ✓ End-to-end workflow acceptance testing with the marketing team
"We used to spend the first week of every month manually compiling ROI spreadsheets. Now the calculator runs live, the report lands in our inboxes automatically, and we spend that time actually optimising campaigns."
Ready to Bring Clarity to Your Marketing ROI?
Let's discuss how an interactive ROI calculator and automated reporting can help your team make faster, data-driven budget decisions.