A Look at Systematic Withdrawals This calculator may help you estimate how long funds may last given regular withdrawals. You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Have A Question About This Topic? Name Email Address Message Thank you! Oops! Related Content When Do You Need a Will? When do you need a will? The answer is easy: Right Now. Inflation and Your Portfolio Even low inflation rates can pose a threat to investment returns. The Long Run: Women and Retirement For women, retirement strategy is a long race. It’s helpful to know the route.