Practical guides
CalcBix Blog
Original guides that explain formulas, common mistakes, and how to use free calculators for smarter finance, business, SaaS, and marketing decisions. Each post links to the relevant CalcBix tool so you can practice with real numbers.
How to Calculate Loan EMI Step by Step
Calculate your loan EMI using the standard formula. Understand monthly payments, total interest, and how extra payments reduce borrowing cost.
Read guideMortgage Calculator Guide for First-Time Buyers
Plan your first mortgage with confidence. See how down payment size, rate, and term affect monthly payments and total interest cost over 15 or 30 years.
Read guideHow Amortization Works
Understand why early loan payments are mostly interest and how extra principal payments save money. Includes a step-by-step amortization schedule walkthrough.
Read guideHow to Pay Off Credit Card Debt Faster
See how minimum payments extend credit card debt for years — and how increasing your monthly payment by a small amount cuts total interest dramatically.
Read guideDebt Snowball vs Debt Avalanche
Compare two debt payoff strategies: snowball targets the smallest balance first; avalanche targets the highest rate. Understand the trade-offs with a worked example.
Read guideCompound Interest Explained
See how interest on interest builds over time. Step-by-step formula walkthrough, practical examples, and a comparison of daily vs monthly vs annual compounding.
Read guideHow to Calculate Profit Margin
Learn the difference between gross margin, operating margin, and net margin — with formulas, a worked example, and the markup vs margin distinction explained clearly.
Read guideGross Profit vs Net Profit
Gross profit and net profit measure different things. Learn what each reveals about business health and how to calculate both from a profit and loss statement.
Read guideHow to Calculate ROI
Calculate return on investment correctly. Includes the annualised ROI formula for comparing investments of different durations and the most common calculation errors.
Read guideHow to Calculate Break-even Point
Find the sales volume needed to cover all costs. Understand contribution margin and use break-even analysis to guide pricing, hiring, and expansion decisions.
Read guideImport Duty Calculator Guide
Import duty is charged on item value plus shipping, and import tax is then charged on top of that. Learn landed cost calculation and de minimis threshold pitfalls.
Read guideStartup Cost Planning Guide
Estimate the real cost of launching a business: one-time setup costs, monthly operating expenses, runway targets, and how to calculate how much capital you need.
Read guideHow to Calculate Customer Acquisition Cost
Calculate CAC by including all sales and marketing costs — not just ad spend. Understand blended vs channel-specific CAC and how to compare it against LTV.
Read guideCost Per Lead Explained
A low CPL only matters if lead quality is high. Learn to calculate CPL, qualified CPL, and effective CAC — and why conversion rate connects them all.
Read guideConversion Rate Optimization Basics
Understand how conversion rate is calculated and how a 0.5% improvement in CVR can increase revenue significantly without spending more on traffic.
Read guideROAS vs ROI Explained
A high ROAS does not always mean profit. Learn how ROAS and ROI differ and why you need gross margin alongside both metrics to evaluate ad campaign performance.
Read guideSaaS MRR Explained
Monthly Recurring Revenue is the foundation of SaaS reporting. Learn the five MRR components, how to calculate net new MRR, and how to avoid common errors.
Read guideSaaS ARR Explained
ARR is an annualisation of current MRR — not last year's revenue. Learn what ARR measures, how to project it, and how to present it alongside churn and growth rate.
Read guideHow to Calculate Churn Rate
3% monthly churn equals roughly 30% annual churn. Learn how to calculate customer churn, revenue churn, and net revenue churn — and why the difference matters.
Read guideLTV to CAC Ratio Explained
LTV:CAC ratio measures whether acquisition spending is economically sustainable. Learn the formula, what a 3:1 ratio means in practice, and how churn affects it.
Read guideLooking for a calculator?
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