Business & Marketing calculators (17)

Advertising metrics (CPM, CPC, CTR, ROAS, RPM revenue), A/B test significance, CAC/LTV, churn, marketplace and payment fees, burn rate, freelance rates, inventory.

Markdown version: /business.md · JSON: /api/v1/calculators?category=business

• Ad Metrics Calculator (CPM, CPC, CTR, CPA) — Computes the standard paid-advertising metrics cost per mille (CPM), cost per click (CPC), click-through rate (CTR), cost per acquisition (CPA) and click-to-conversion rate from campaign spend, impressions, clicks and conversions. (md · api)
• Ad Revenue Calculator (RPM) — Estimates publisher ad earnings per day, month (365/12 days) and year from page views and RPM (revenue per 1,000 impressions), optionally with several ad units per page and a fill rate, and solves for the page views needed to reach a target monthly revenue. (md · api)
• Conversion Rate Calculator — Computes the conversion rate (conversions / visitors × 100), conversions per 1,000 visitors and visitors per conversion, and the number of visitors required to reach a target number of conversions at the same rate. (md · api)
• A/B Test Significance Calculator — Tests whether a variant's conversion rate differs from the control's using the pooled two-proportion z-test, and reports both rates, absolute and relative lift, z-score, two-sided p-value, a confidence interval for the difference and the sample size needed per variant to detect the observed lift with 80 % power. (md · api)
• CAC and LTV Calculator — Computes customer acquisition cost from marketing spend and new customers, customer lifetime value from monthly revenue per customer, gross margin and monthly churn (lifetime = 1 / churn), plus the LTV:CAC ratio and CAC payback period in months. (md · api)
• Churn Rate Calculator — Computes the customer churn rate for a period from customers at the start and customers lost, the retention rate, the ending customer count and net growth including customers gained, the annualised churn rate and the implied average customer lifetime (1 / churn). (md · api)
• PayPal Fee Calculator — Computes the PayPal fee and net amount for a US sale using the published US merchant rates (as of 2026-09: PayPal Checkout 3.49 % + $0.49, standard card 2.99 % + $0.49, goods & services 2.99 %, QR code 2.29 % + $0.09, +1.50 % international), or the gross amount to charge to net a target; rates can be overridden. (md · api)
• Stripe Fee Calculator — Computes the Stripe processing fee and net payout for a US card payment using Stripe's published standard pricing (as of 2026-09: 2.9 % + $0.30 per successful domestic card charge, +1.5 % international cards, +1 % currency conversion, +0.5 % manually entered cards), or the gross amount to charge to net a target. (md · api)
• eBay Fee Calculator — Computes eBay's final value fee and net proceeds for a US sale in most categories (as of 2026-09: 13.6 % of the total sale amount up to $7,500 per item plus 2.35 % of the portion above, plus $0.40 per order or $0.30 for orders of $10 or less), with optional insertion fee and category-rate overrides. (md · api)
• Etsy Fee Calculator — Computes Etsy's fees and net proceeds for a US sale using the published fee schedule (as of 2026-09: $0.20 listing fee, 6.5 % transaction fee on item price plus shipping, 3 % + $0.25 Etsy Payments processing fee on the total, optional 12–15 % Offsite Ads fee); every rate can be overridden. (md · api)
• Burn Rate and Runway Calculator — Computes gross burn, net burn (expenses minus revenue) and the runway in months from a cash balance, and the projected date the cash runs out when a start date is given. (md · api)
• Freelance Hourly Rate Calculator — Derives the hourly and daily rate a freelancer must bill to reach a target annual income after business overhead and a tax reserve, given billable hours per week and weeks off per year. (md · api)
• Economic Order Quantity (EOQ) Calculator — Computes the economic order quantity that minimises the sum of annual ordering and holding costs (Harris–Wilson formula √(2DS/H)), plus orders per year, days between orders and the resulting annual costs. (md · api)
• Reorder Point Calculator — Computes the inventory level at which to place a new order: average daily demand × lead time plus safety stock, where safety stock is either given directly or derived from a service level and the standard deviation of daily demand (z × σ × √lead time). (md · api)
• ROAS Calculator — Computes return on ad spend (revenue / ad spend) as a ratio and percentage, the advertising cost of sales (ACoS), and, when the gross margin is given, the break-even ROAS (1 / margin) and the gross profit left after ad spend. (md · api)
• Sales Commission Calculator — Computes the commission on a sale at a flat percentage, or with a two-tier plan where a higher rate applies above a threshold, either marginally (only on the amount above the threshold) or retroactively (on the whole amount), plus the effective rate and the net to the company. (md · api)
• MRR Growth Calculator — Projects monthly recurring revenue after n months of compound growth from a starting MRR and a monthly growth rate (given directly or derived from new, expansion and churned MRR), and reports the resulting ARR, total growth, the equivalent annual growth rate and the doubling time. (md · api)