Budgeting & Personal Finance
Calculators for budgeting, salary forecasting, and debt reduction.
Budget Planner
Plan your monthly budget and track expenses.
Salary Calculator
Convert annual salary to hourly, monthly, and after-tax pay.
ADP Paycheck Calculator
Estimate net take-home pay from hourly or salary wages.
Debt Snowball
Calculate the fastest way to pay off multiple debts.
Auto Loan Payoff
Calculate interest savings from extra car loan payments.
Rule of 72
Estimate how long it takes to double your money with compound interest.
CD vs HYSA
Compare interest yields between locked CDs and liquid savings.
Percentage Calc
Calculate increases, decreases, and reverse percentages.
ROI Calculator
Calculate Return on Investment and annualized yield.
Percentage Increase
Calculate exact percentage growth instantly.
Percent Change
Calculate percent change between two values.
The Simple Toolbox's free finance calculators cover compound interest, debt payoff, retirement planning, and investment analysis. Every tool runs in your browser — no account, no data uploaded, no subscription.
Frequently Asked Questions
What finance calculators are available?
Compound interest, debt snowball, CD vs HYSA comparison, ROI calculator, rule of 72, rate calculator, and percentage calculator — all free, all browser-based.
Are these calculators accurate?
All use standard financial formulas validated against published sources. Results are estimates for planning purposes — consult a financial advisor for personalized advice.
Do I need to create an account?
No. Every calculator works instantly with no sign-up, no email, and no subscription required.
Is my financial data private?
Yes. Every calculation runs locally in your browser. No numbers you enter are ever sent to a server or stored anywhere.