Finance Notebook Templates — Interest, Loans, ROI

These finance notebook templates are designed for repeatable, auditable calculations. Each template opens in GetCalcMaster Notebook so you can adjust assumptions (rates, terms, fees) next to the math.

Finance templates

• APR vs Effective Annual Rate (EAR) — Notebook Template — Convert nominal APR to effective annual rate (EAR) given compounding frequency. Useful for apples-to-apples comparisons.
• CAGR Calculator (Compound Annual Growth Rate) — Notebook Template — Compute CAGR between two values over time. Includes a quick check for negative growth and edge cases.
• Compound Interest Calculator (Notebook Template) — Compute compound interest with adjustable principal, rate, compounding frequency, and time. Includes sanity checks and what to verify.
• Loan Payment Calculator (Amortized) — Notebook Template — Compute fixed monthly payment for an amortized loan (mortgage/auto). Includes total paid and total interest.
• ROI Calculator (Return on Investment) — Notebook Template — Compute ROI from gain and cost, and compare multiple scenarios side-by-side in a reproducible notebook.
• Simple Interest Calculator (Notebook Template) — Compute simple interest (I = P·r·t) and total amount. Good for quick estimates and verification baselines.

Browse all templates or start with the Mortgage Calculator for monthly payment and amortization.