The big decisions in a normal money life
Most people face the same handful of financial choices. How much cash should sit in savings? What will my paycheck actually be after tax? Can I retire, and how much can I take out each year? Should I rent or buy? Do I take the pension or the lump sum?
The eight calculators below are built around those questions. They run in your browser, and nothing you type is stored on our servers.
Know your real paycheck
A salary figure and a deposit are two different things. Federal tax, state tax, Social Security, Medicare and your benefits contributions all come out before the money lands.
There are three take-home pay calculators. The US version handles federal and state tax, FICA and pre-tax benefits for 2026, and shows net pay per check. The UK version uses 2025/26 income tax, National Insurance, pension and student loan repayments. The Pakistan version follows FY 2025-26 FBR slabs with EOBI and provident fund, and has separate salaried and freelancer modes with an effective tax rate.
Use them before you accept a job, ask for a raise, or set a budget. Budget from net pay, never gross.
Build the emergency fund first
An emergency fund stops a car repair from becoming a credit card balance. The calculator multiplies your monthly essentials by the number of months you want covered, subtracts the cash you already have, and lays out a month-by-month plan to close the gap.
Three months of essentials is a common starting point. Six makes sense if your income is irregular or you support others. Essentials means rent or mortgage, utilities, food, insurance, minimum debt payments and transport. It doesn't mean your streaming subscriptions.
Keep the money somewhere boring and reachable, like a high-yield savings account.
Retirement: withdrawing and choosing
The 4 percent rule says you can take 4 percent of your portfolio in the first year of retirement, adjust for inflation after that, and have a good chance of lasting 30 years. It comes from historical US data in what's often called the Trinity study. The calculator shows year-by-year depletion, a Social Security offset and several withdrawal rates side by side.
Treat 4 percent as a starting point, not a law. Long retirements, poor early returns and high fees all push the safe number lower.
The pension versus lump sum calculator compares a monthly payment for life with a lump sum you invest yourself. It finds the break-even age and net present value, with options for cost-of-living increases and return assumptions. A pension is safer. A lump sum is flexible and can be passed on. Your health, other income and the strength of the pension provider all matter.
Housing math
Rent versus buy isn't a feeling, it's a crossover year. The calculator draws a graph from your assumptions about price, rent growth, interest rate and appreciation, and shows when buying pulls ahead. If you might move in three years, buying often loses once closing costs are counted.
The HELOC versus cash-out refinance tool compares total interest and closing costs and finds when a refinance pays back its fees. A HELOC usually has a variable rate and low upfront cost. A cash-out refi replaces your whole mortgage, which is a bad idea if your current rate is far below today's.
Mistakes to avoid
Using optimistic returns. Assume less than you hope for and you'll rarely be disappointed.
Forgetting inflation. A fixed pension loses buying power each year.
Ignoring taxes on withdrawals. Money in a traditional account is taxed when you take it out.
Making one big decision from one number. Run each tool with a good case, a bad case and a middle case.
A note on advice
These tools estimate. They can't see your whole situation. For large choices like a pension decision or a home purchase, a fee-only planner is worth the money.