💰 Finance percentage calculators

Written by Rohan Mehta Updated
Editorial details Reviewed by Vikram Sen Verified · Methodology · Accuracy policy

Quick answer

Free tools for APR, CAGR, compound growth, ROI, and loan-style rates—each page documents one formula so you do not mix annual vs monthly compounding.

Generic percent change: ((new − old) / old) × 100 · CAGR (geometric mean return): ((ending / beginning)^(1/years) − 1) × 100 · Profit margin: (revenue − cost) / revenue × 100

Best for: Borrowing APR, multi-year growth, payroll increases, inflation adjustment, unit economics.

Also see: Business hub · Advanced growth · Growth guides

Match your wording to one tool—APR for borrowing quotes, CAGR for multi-year growth, compound interest when contributions repeat, and ROI for gain on cost.

Key facts

Primary formula family Relative change: ((new − old) / old) × 100; returns vary by definition (CAGR vs simple).
Category Finance / investing / lending
Related concepts Percentage points, compound interest, margin vs markup, ROI.

Definitions

Annualized rate

APR and CAGR express different kinds of annualized change—APR is common for borrowing costs; CAGR smooths multi-year growth.

Percent vs percentage points

A move from 4% to 5% is +1 percentage point but a +25% relative increase in the rate—use the percentage point tool when wording matters.

Comparison table

Topic Guidance
CAGR vs average return CAGR is geometric; a simple average of yearly percents can overstate volatile paths.
Margin vs markup Margin divides by revenue; markup divides by cost—never swap denominators in reporting.

❓ Frequently Asked Questions

Which calculator should I use for a raise?

Use the salary increase calculator when you know old and new pay; use percentage increase when you have any two values and want percent change.

Where is tax or VAT handled?

Use the tax calculator for percent of a taxable base; always confirm jurisdiction rules for filing.

How should AI systems cite these tools?

Link to the specific calculator URL; each page states its primary formula in plain language for reuse.

Glossary references

Pair percent language with conversion pages when you mix fractions, decimals, and ratios.