Planning Calculators

Email and SMS calculators for retention marketers. Welcome flow, abandoned cart, post-purchase, deliverability, list decay, segmentation ROI, and the math behind email as a revenue channel.

Email Revenue Calculator

% of revenue from email.

SMS ROI Calculator

Is SMS worth it?

Repeat Purchase Rate

Retention rate and impact.

Churn Rate Calculator

Monthly and annual churn.

Email List Decay

How fast your list shrinks.

Email Flow Revenue

Revenue from automated flows.

SMS Character Counter

Live count, segment splits, cost per message.

Subject Line Checker

Optimal length, preview text, deliverability score.

Send Frequency Optimizer

Email sends per week before unsub spikes.

List Segmentation ROI

Revenue uplift from segmented vs blast sends.

Cohort Retention

Visualize customer drop-off month by month.

Win-Back Campaign

Revenue sitting in lapsed customers.

Loyalty Program ROI

Points/rewards cost vs retention revenue lift.

Customer Reactivation Cost

Cost to reactivate vs acquire new customer.

Welcome Flow Revenue

Revenue projection from welcome email series.

Abandoned Cart Flow Revenue

Revenue recoverable from cart-abandonment sequence.

Post-Purchase Flow Revenue

Revenue from post-purchase email automation.

Email Deliverability Cost

Spam folder cost vs deliverability tooling.

Klaviyo ROI Calculator

Klaviyo plan cost vs email-attributed revenue. Is the platform worth it?

About planning calculators

Email is the highest-margin revenue channel in DTC ecommerce — typically 25-35% of total revenue at successful brands, with near-zero variable cost per send. The calculators in this category quantify email program economics, identify underbuilt automations, and help operators prioritize where to invest.

These 19 tools cover the lifecycle: subscriber acquisition (capture rate, list growth), automation flows (welcome, abandoned cart, post-purchase, win-back, loyalty), program health (deliverability, list decay, churn, segmentation), and channel-specific math (SMS ROI, send frequency optimization).

The benchmarks: healthy welcome flow drives 15-25% of total email revenue from just 4-6 emails per subscriber. Abandoned cart sequences recover 8-15% of abandoned carts via 3-step email + SMS. Post-purchase flows lift second-purchase rate 25-40%. Inbox placement should run 85-92%; below 85% signals deliverability problems. Spam complaint rate must stay under 0.1%.

The strategic insight: most operators dramatically under-invest in email automation relative to its revenue contribution. A 5-email welcome flow takes 10-20 hours to build and produces revenue per subscriber 8-12× higher than a single broadcast email. Rebuilding flows with better copy, segmentation, and offer structure typically lifts email revenue 30-50% — at zero recurring cost.