Definition
An email ROI forecast is a projection of the expected return on investment for planned email activity, calculated by estimating future revenue and cost and applying the standard email-roi formula. It extends ROI from a backward-looking report into a forward-looking planning tool. Forecasts are used to justify budget, prioritise campaigns, and set performance expectations before money is spent.
How It Works
A ROI forecast applies the ROI framework to anticipated rather than actual numbers. Because it deals with the future, it relies on assumptions drawn from historical performance and planned changes.
- Revenue projection — expected revenue is estimated from projected send volume, conversion-rate, and average order value.
- Cost projection — expected costs include platform fees, content production, incentives, and staff time.
- Scenario modelling — forecasts typically present a range, such as conservative, expected, and optimistic, to reflect uncertainty.
Forecasts are only as credible as their inputs. Anchoring them to measured historical metrics such as revenue-per-email improves accuracy, while unsupported assumptions undermine the result.
How to Calculate
Build an email ROI forecast in four steps:
- Project revenue — estimate revenue from planned sends using historical conversion data.
- Project cost — total all anticipated costs of the campaign or program.
- Subtract — subtract projected cost from projected revenue to get projected profit.
- Divide — divide projected profit by projected cost and multiply by 100.
ROI Forecast = (Projected Revenue - Projected Cost) / Projected Cost x 100
| Variable | Description |
|---|---|
| Projected Revenue | Expected revenue from the planned email activity |
| Projected Cost | Expected total cost of the planned email activity |
Example
A brand plans a seasonal campaign expected to generate £80,000 in revenue at a projected cost of £12,000. The forecast profit is £68,000, and dividing by £12,000 gives a projected ROI of 567%. The brand uses this forecast to green-light the campaign and set a performance target.
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Frequently Asked Questions
Measured email-roi reflects actual revenue and cost after the fact, while a forecast projects those figures before the activity occurs. A forecast is a plan; measured ROI is a report card.
Credible forecasts are anchored to historical performance and clearly stated assumptions. Presenting a range rather than a single point, and updating the forecast as actuals arrive, also builds confidence.
Overestimating conversion or revenue and underestimating cost are the most common errors. Using conservative historical baselines and scenario ranges mitigates this risk.
Forecasts should be revisited as campaign results and new data arrive, typically monthly or quarterly, so that plans stay aligned with reality rather than drifting from it.