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All 8 saving and investing calculators
Asset Allocation Rebalancing Calculator
Works out what to trade to bring a portfolio back to its target weights, and answers two further questions: whether the drift is far enough past your tolerance band to be worth trading on at all, and how much of the job a contribution directed at the underweight holdings can do without selling anything. Use it before placing trades, to see what a sale would cost you and whether new money can spare you one.
Saving and InvestingCompound Interest Growth Calculator
Projects a balance forward at a rate you quote, adding the interest as often as the account really adds it, from once a year to continuously, and reports the effective annual rate that frequency actually pays. It also compares the answer against the same money at simple interest, so the part of the balance that is compounding rather than deposits is a figure rather than a feeling, and puts the whole projection on a grid of rates and horizons.
Saving and InvestingCrypto DCA Cost Basis Calculator
Enter your crypto purchases and the price today, and see your average cost, the units you hold, your gain or loss and how much of it is on purchases held more than one year, and compare selling a share of your units first in, first out, last in, first out or highest cost first. Then simulate a fixed purchase every 1, 2 or 4 weeks across 100 weekly price paths inside a seeded, reproducible workbook, and see the range of the plan's value by week and the chance that it ends below what it put in. Gains and holding periods, not the tax on them. Estimates for education, not advice.
Saving and InvestingDollar Cost Averaging vs Lump Sum Calculator
Compares investing a sum all at once against feeding it in over several months, on a return you supply, and reports what each is worth at the end, how much the waiting costs and what it saves if the market falls instead. It also runs the comparison across a band of returns you are unsure about and reports how often each way comes out ahead.
Saving and InvestingInvestment Fees Drag Calculator
Prices an investment fee as what it costs rather than as what it is billed: the same plan is run twice, once with no fee and once with the fees you pay, and the gap between the two balances is split into the fees charged and the growth those fees never made. A one percent annual charge over thirty years costs about two and a half times the fees actually taken and a quarter of the final pot, and it also prices a second fee against yours so an active fund and a tracker can be compared in one place.
Saving and InvestingReal vs Nominal Return Calculator
Turns a nominal return into what it is actually worth once inflation and, optionally, tax have taken their share, using the Fisher relation rather than the usual shortcut of subtracting inflation from the return. It reports the exact real return beside the shortcut and the gap between them, the return needed merely to keep pace after tax, what a starting amount becomes on a statement against what it will buy, and a weighted grid of both rates that says how often the money gains purchasing power at all.
Saving and InvestingRule of 72 Doubling Time Calculator
Puts the rule of 72 beside the exact doubling time for your rate and compounding frequency, and reports how far the rule is off in years and as a share, the numerator that would be exact at your rate, and the range of rates over which the rule stays within a quarter of a year. It also gives the exact time to triple and to grow tenfold, and tabulates the error across a grid of rates and numerators so the safe region can be seen rather than assumed.
Saving and InvestingSavings Goal Calculator
Works out what you must put aside each month to reach a savings goal by a deadline, given what you have already saved and the return you expect. It then does the two things a single division cannot: it restates the goal at the deadline when the thing you are saving for gets more expensive, and it runs the whole plan again across a spread of returns, so the answer arrives as a chance of getting there and a range of outcomes rather than as one confident number.