Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

401(k) Retirement Calculator

Project your 401(k) value at retirement from your age, salary, contributions, and employer match. Uses your current age and retirement age to set the growth horizon.

Current Age (years)

Retirement Age (years)

Current 401(k) Balance ($)

Annual Salary ($)

Your Contribution (%)

Employer Match (%)

Expected Annual Return (%)

Fill in the required fields to see your result.

Economics

Compound Interest Calculator

Project the future value of a lump-sum investment when interest is reinvested each year using A = P · (1 + r)ᵗ. The simplest compounding model — assumes annual compounding, a constant rate, and no additional contributions or withdrawals.

Principal Amount ($)

Annual Interest Rate (%)

Time Period (years)

Fill in the required fields to see your result.

Key differences

	401(k) Retirement Calculator	Compound Interest Calculator
Category	Personal Finance	Economics
Inputs required	7	3
Result	Projected 401(k) Value ($)	Final Amount ($)
What it does	Project your 401(k) value at retirement from your age, salary, contributions, and employer match. Uses your current age and retirement age to set the growth horizon.	Project the future value of a lump-sum investment when interest is reinvested each year using A = P · (1 + r)ᵗ. The simplest compounding model — assumes annual compounding, a constant rate, and no additional contributions or withdrawals.