# OmniCalc


## Posts

- [LTV to CAC: Align the Definitions and Check Payback](https://omnicalc.info/ltv-cac-ratio-payback-guide/): Build a margin-based lifetime value estimate, compare it with CAC and see why an attractive ratio can still create a cash-flow problem.
- [Customer Churn: Cohorts, Retention and the Annualization Trap](https://omnicalc.info/customer-churn-cohort-retention-guide/): Measure churn from a starting cohort, distinguish it from net customer growth and calculate annual cohort loss from monthly churn.
- [MRR vs ARR: Normalize Subscriptions Without Confusing Cash and Revenue](https://omnicalc.info/mrr-arr-subscription-revenue-guide/): Calculate MRR and ARR for monthly and annual plans, and distinguish recurring run rate from cash collection and accounting revenue.
- [Free Shipping Thresholds: Cover Shipping Without Hiding the Cost](https://omnicalc.info/free-shipping-threshold-profit-guide/): Estimate a free-shipping threshold from margin and fulfillment costs, then test mixed baskets, fees and customer behavior.
- [Economic Order Quantity: Use EOQ Without Ignoring Real Constraints](https://omnicalc.info/economic-order-quantity-practical-guide/): Calculate EOQ, compare nearby pack sizes and understand the assumptions behind annual ordering and holding-cost estimates.
- [Reorder Point vs Safety Stock: Know When to Replenish](https://omnicalc.info/reorder-point-safety-stock-difference/): Distinguish reorder point from safety stock and order quantity, with demand, lead-time and inventory-position examples.
- [Inventory Turnover and Inventory Days: Handle Seasonality Correctly](https://omnicalc.info/inventory-turnover-days-seasonality/): Calculate inventory turnover and days on hand, understand the 365-day assumption and avoid misleading averages in seasonal businesses.
- [COGS and Inventory: Reconcile Opening Stock, Purchases and Closing Stock](https://omnicalc.info/cogs-inventory-reconciliation-guide/): Reconcile cost of goods sold from inventory balances, identify valuation mistakes and understand how a stock-count error affects gross profit.
- [Revenue Growth: Compare Periods and Avoid Percentage Traps](https://omnicalc.info/revenue-growth-period-comparison-guide/): Measure revenue growth using comparable periods, understand percentage reversals and combine segment growth without averaging errors.
- [Average Order Value: Calculate It Without Misreading Growth](https://omnicalc.info/average-order-value-weighted-average-guide/): Calculate AOV across segments correctly, account for refunds and distinguish a bigger basket from better profit per customer.
- [CPA vs CAC: Measure the Cost of Acquiring a Customer Correctly](https://omnicalc.info/cpa-vs-cac-acquisition-cost/): Distinguish advertising CPA from fully loaded CAC, with a lead-to-customer example and guidance on cost scope and timing.
- [Build an Ad Budget from Clicks, Conversion Rate and Order Value](https://omnicalc.info/ad-budget-clicks-conversions-order-value/): Model advertising revenue from budget, CPC, conversion rate and order value, then stress-test the assumptions before spending.
- [CPC, CPM and CTR: How the Three Advertising Metrics Connect](https://omnicalc.info/cpc-cpm-ctr-formula-relationship/): Connect CPC, CPM and CTR with one campaign example, identify denominator mistakes and understand why cheaper traffic may not convert.
- [ROAS Is Not Profit: Calculate Your Advertising Break-Even Point](https://omnicalc.info/roas-profit-break-even-advertising/): Learn why a high ROAS can still lose money, and calculate a break-even threshold using pre-ad contribution margin and fixed costs.
- [Discounts and Profit: How Much Extra Volume Makes a Sale Worthwhile?](https://omnicalc.info/discount-profit-extra-sales-volume/): Calculate how a discount changes unit contribution and the extra sales needed to preserve profit, with a worked promotion example.
- [Target Profit Planning: How Many Units Must You Sell?](https://omnicalc.info/target-profit-sales-units-planning/): Turn a desired profit into a unit-sales target, then test price changes, capacity constraints and the margin of safety.
- [Contribution Margin and Break-Even: From One Sale to Fixed-Cost Coverage](https://omnicalc.info/contribution-margin-break-even-guide/): Connect unit contribution to break-even sales, with whole-unit rounding, revenue calculations and a two-product sales-mix example.
- [Gross, Operating and Net Profit: Read the Three Layers Correctly](https://omnicalc.info/gross-operating-net-profit-differences/): Compare gross, operating and net profit using one income-statement example, and learn why the three margins answer different questions.
- [Ecommerce Profit: Build a Complete Cost Model for Each Order](https://omnicalc.info/ecommerce-profit-cost-per-order-guide/): Build an ecommerce order-profit model that separates unit costs, campaign totals and overhead, with a detailed 100-order example.
- [Wholesale Pricing: Set a Price That Works for You and the Retailer](https://omnicalc.info/wholesale-pricing-retailer-margin-guide/): Learn how wholesale and retail margins interact, with a worked pricing example, volume-discount checks and common costing mistakes.
- [Compound Interest Calculator: How Savings Grow Over Time](https://omnicalc.info/compound-interest-calculator-guide/): Learn the compound interest formula, compounding frequency, worked examples and the impact of regular contributions.
- [Percentage Calculator Guide: Percentage Increase, Decrease and Reverse Percentages](https://omnicalc.info/percentage-calculator-guide/): Understand percentage calculations with practical formulas and worked examples for discounts, growth and original prices.
- [How to Calculate Profit Margin: Formula, Examples and Common Mistakes](https://omnicalc.info/how-to-calculate-profit-margin/): Learn the difference between profit margin and markup, calculate gross margin step by step, and avoid common pricing mistakes.

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