PERSONAL FINANCE & MATH

Money & Everyday Math Tools

A few transparent calculations can clarify monthly loan obligations, dining costs and percentage changes. These tools are designed to show the numbers rather than hide the arithmetic.

4 free tools in this collection

Choose a tool for your task

Choose the appropriate task, enter your values and inspect the supporting notes or formula.

Everyday toolUniversal Unit Converter

Convert length, weight, temperature, area and volume instantly.

Open tool →Everyday toolPercentage Calculator

Find percentages, percent changes and what percent one value represents.

Open tool →Everyday toolLoan Payment & Interest Calculator

Estimate monthly payments, total interest and payoff time.

Open tool →Everyday toolTip & Bill Split Calculator

Split a restaurant bill and tip fairly between people.

Open tool →

A practical way to get started

Plan monthly payments
Estimate fixed-rate installments and compare extra principal repayments.
Split shared expenses
Find tips and taxes separately before dividing the bill.
Check percentages
Use percentage and unit converters for routine comparisons.

Important limitations

Loan outputs exclude fees, taxes and insurance. Interest, tipping and payment rules differ by agreement and location.