THE FREE CALCULATOR LIBRARY
Find the numbers.
Make better decisions.
Explore free calculators with instant results, clear formulas, and practical examples.
BROWSE BY TOPIC
Calculator categories
POPULAR TOOLS
Explore calculators
LEARN THE MATH
Latest Articles
LTV to CAC: Align the Definitions and Check Payback
Build a margin-based lifetime value estimate, compare it with CAC and see why an attractive ratio can still create a cash-flow problem.
Read guide ↗October 15, 2026Customer Churn: Cohorts, Retention and the Annualization Trap
Measure churn from a starting cohort, distinguish it from net customer growth and calculate annual cohort loss from monthly churn.
Read guide ↗October 15, 2026MRR vs ARR: Normalize Subscriptions Without Confusing Cash and Revenue
Calculate MRR and ARR for monthly and annual plans, and distinguish recurring run rate from cash collection and accounting revenue.
Read guide ↗October 15, 2026Free Shipping Thresholds: Cover Shipping Without Hiding the Cost
Estimate a free-shipping threshold from margin and fulfillment costs, then test mixed baskets, fees and customer behavior.
Read guide ↗October 15, 2026Economic Order Quantity: Use EOQ Without Ignoring Real Constraints
Calculate EOQ, compare nearby pack sizes and understand the assumptions behind annual ordering and holding-cost estimates.
Read guide ↗October 15, 2026Reorder Point vs Safety Stock: Know When to Replenish
Distinguish reorder point from safety stock and order quantity, with demand, lead-time and inventory-position examples.
Read guide ↗