ROI Calculator & Budget Planner·E-commerce

Turn E-commerce Spend Into Predictable Profit

Model ROAS, CAC, AOV, and LTV in one place. Build a channel budget that protects margin, prevents stockouts, and scales what actually converts.

Why it matters

Why E-commerce businesses choose ROI Calculator & Budget Planner.

E-commerce growth lives and dies by unit economics. Between paid social volatility, Google Shopping competition, promo-driven demand, and rising fulfillment costs, a “good” ROAS can still produce negative contribution margin. An ROI Calculator & Budget Planner helps you forecast profit – not just revenue – by tying spend to CAC, AOV, gross margin, shipping, returns, and platform fees. With multiple acquisition channels (Meta, Google, TikTok, affiliates, email, marketplaces) and different attribution windows, it’s easy to overfund the loudest channel and underfund the most profitable one. A dedicated planner lets you compare scenarios side by side – prospecting vs retargeting, new vs returning customers, full-price vs discount – and allocate budget based on incremental ROI. When paired with inventory and cash-flow realities, budgeting becomes a control system. You can set spend caps based on stock levels, project break-even ROAS by SKU or collection, and decide when to push bundles, subscriptions, or upsells to lift AOV and LTV without eroding margin.
2.5x
Break-even ROAS
Example target for a store with ~60% gross margin, 8% discounts, 12% returns, and ~$8 fulfillment and fees – illustrates why profit-based ROAS matters.

Benefits

Built for E-commerce.

Profit-first forecasting beyond ROAS

Calculate contribution margin after COGS, shipping, returns, payment processing, and marketplace fees so you don’t scale campaigns that look efficient but lose money.

Channel budget allocation tied to CAC and LTV

Plan spend by channel using blended vs incremental CAC, payback period, and cohort LTV – ideal for balancing prospecting, retargeting, email/SMS, and affiliates.

Break-even ROAS and promo impact modeling

Model how discounts, free shipping thresholds, and bundles change AOV and margin. Set break-even ROAS targets per campaign and protect profitability during peak sales.

Inventory-aware scaling and cash planning

Align budget with stock on hand, lead times, and reorder points. Avoid overspending into stockouts or tying up cash in inventory that can’t support demand.

Use cases

E-commerce use cases.

Scaling paid social without killing margin

Challenge

Meta performance improves, but higher CPMs and discounting shrink contribution margin. The team can’t tell if they’re buying profitable customers or just revenue.

Solution

The ROI Calculator & Budget Planner models CAC, AOV, gross margin, and return rate by campaign. It outputs a profit-based target ROAS and spend tiers that keep margin positive as budgets increase.

Choosing between Google Shopping and marketplaces

Challenge

Sales are split between Google Shopping and Amazon/Walmart. Marketplace fees and returns are higher, but conversion is stronger. Budget decisions are made on top-line revenue.

Solution

Plan ROI per channel with fee stacks, refund rates, and shipping costs. Compare true net profit per order and reallocate budget to the channel with the best incremental contribution margin.

Planning Q4 and promo calendar spend

Challenge

BFCM and holiday promos drive volume, but discounts, higher return rates, and fulfillment surcharges make results unpredictable. Stockouts risk wasted spend.

Solution

Run scenarios for promo depth, free-shipping thresholds, and expected return rates. Set spend caps based on inventory coverage and forecast cash needs for reorders while protecting payback period targets.

More industries

ROI Calculator & Budget Planner for other industries.

Accounting & FinanceRetailFashion & ApparelBeauty & CosmeticsJewelryFood & BeverageHome & GardenSaaS

FAQ

Frequently asked questions.

How is an E-commerce ROI Calculator different from a simple ROAS calculator?

A ROAS calculator focuses on revenue divided by ad spend. An E-commerce ROI Calculator & Budget Planner goes deeper – it includes COGS, shipping and fulfillment, payment processing, platform fees, discounts, and returns to estimate contribution margin and profit. It can also incorporate CAC, LTV, and payback period so you can budget for customer acquisition sustainably, not just chase revenue.

What inputs should I include for the most accurate ROI model?

At minimum: AOV, gross margin (or COGS), blended conversion rate, return/refund rate, shipping and fulfillment cost per order, payment processing fees, and ad spend by channel. For more precision: new vs returning customer mix, cohort LTV, discount rate, subscription attach rate, and channel-specific fee structures (e.g., Amazon referral fees).

Can this help me set a break-even ROAS target per product or collection?

Yes. By using product-level margin, average discounting, shipping cost, and expected return rate, the planner can calculate break-even ROAS (and break-even CAC) per SKU, collection, or bundle. That makes it easier to scale high-margin items, set bid targets in Shopping, and avoid over-investing in low-margin products unless LTV justifies it.

How do I budget across prospecting and retargeting without double-counting conversions?

Use the planner to separate assumptions for prospecting vs retargeting – different CAC, conversion rates, and incremental lift. Allocate budget based on incremental ROI and payback period rather than last-click attribution. Many teams set guardrails like a minimum new-customer share, a target blended CAC, and a cap on retargeting spend once frequency rises or marginal ROAS declines.

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