Everyday-money toolbox
Quick math for life's money moments.
Five tiny calculators. Type a number, get an answer. Nothing leaves your device.
First time here? This is the whole app:
- Five tiny tools — plan a month, split a bill, aim at a savings goal, size up a loan, split a paycheck. Pick one from the row of tabs below.
- Live math — answers update as you type. No calculate button, no sign-up, nothing to install.
- Private by design — your numbers stay in this browser (localStorage only). Nothing is uploaded, ever.
Estimates only — not financial advice. These tools do simple math on the numbers you type; everything here is the opinion of the author, for general information. It isn't financial, tax, or investment advice and doesn't account for taxes, fees, or your full picture. Any result here is illustrative, not a promise — outcomes vary. Verify before you act, and talk to a qualified professional. Read the full disclaimer.
Monthly plan
Give every dollar of the month a job — a simple envelope plan.
Enter your income, then give each category a slice. When "Left to assign" hits $0.00, every dollar has a job.
Tip & split
What's the bill, how much tip, and how many people?
Enter the bill amount to see each person's share.
Savings goal
How long until you hit your goal?
Loan / payoff estimator
Rough monthly payment and what the interest adds up to.
Enter the loan amount and term to see an estimate.
Assumes a fixed rate, equal monthly payments, and interest compounded monthly. An estimate to explore with, not a quote — your real loan may differ.
Paycheck splitter
The 50 / 30 / 20 rule of thumb — needs, wants, savings. Edit the percentages to fit you.
A classic rule of thumb, not a rule — tune the splits to match your real life.