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Calculators tools
Quick calculators for everyday decisions.
Calculators
Shallow Work Audit
Calculate how much of your workweek is shallow work — meetings, email, Slack, and admin — versus time left for deep work. Cal Newport–style audit in 60 seconds.
Calculators
Too Many Goals Calculator
How many goals is too many? Enter your active goals and available focus hours — see goal dilution, Keller's go-small math, and why you need ONE Thing per horizon.
Calculators
Fixed Schedule Productivity Calculator
Cal Newport's fixed-schedule productivity: pick your end time, enter your shallow load — see how many deep work hours fit and what must get cut to leave on time.
Calculators
Compound Growth Calculator
See how a lump sum grows with compounding over time. Enter starting balance, annual growth rate, years, and compounding schedule — free projection with chart and year-by-year table.
Calculators
Investment Growth Calculator
Project how much your investment could grow with starting balance, contributions, annual return, and timeline. Free calculator with summary, chart, and year-by-year table.
Calculators
Savings Goal Calculator
Find how much you need to save each month or year to reach a target investment balance. Free calculator with contribution schedule, growth assumptions, chart, and table.
Calculators
Investment Time Calculator
Find how long it takes to reach your investment goal. Enter target amount, starting balance, contributions, and growth rate — free timeline projection with chart and table.
Calculators
Required Return Calculator
Find what annual growth rate you need to reach an investment goal. Enter target, starting balance, timeline, and contributions — free calculator with chart and breakdown.
Calculators
Initial Investment Calculator
Find how much you need to invest upfront to reach a goal. Enter target amount, timeline, contributions, and growth rate — free lump-sum calculator with chart and table.
Calculators
Investment Doubling Calculator
Find how long it takes to double your investment at a given growth rate. Compare exact compounding math to the Rule of 72 — free calculator with chart and breakdown.
Calculators
Investment Withdrawal Calculator
See how long your savings last with fixed monthly withdrawals and a growth assumption. Free drawdown calculator with timeline chart and year-by-year table.