Roth 401(k) vs. Traditional 401(k) This calculator compares employee contributions to a Roth 401(k) and a traditional 401(k). You are viewing this website at a small screen resolution which doesn't support calculators. Click here to view this calculator. Related Content Eight Mistakes That Can Upend Your Retirement There are common mistakes you can avoid when saving for retirement. Starting a Roth IRA for a Teen This early financial decision could prove helpful over time. The Value of Insuring Against Life’s Risks Building wealth requires protection from the forces of wealth destruction.