Calculate the minimum return needed from investments to meet financial goals given current savings, timeline, and contributions.
Most goal calculators tell you how much you will have; this one tells you the return you must earn. Enter current savings, a periodic contribution, the number of years until the goal, and the target amount, and the tool works backward to find the annual rate of return that makes the ending balance equal the target exactly. The result is a floor, not a forecast: any realistic plan needs a cushion above it, and the number is nominal, so inflation erodes it unless the goal was already stated in future dollars.
A concrete input and expected output from the current implementation.
Input
Goal: $100,000. Years: 10. Current savings: $10,000. Contributions: $6,000 per year, added at the end of each year.
Expected output
About 6.55% per year (break-even near 6.547%)
At 6.55%, the $10,000 grows to $18,860 (10,000 x 1.0655^10) and the $6,000 year-end contributions grow to $81,157 (6,000 x (1.0655^10 - 1) / 0.0655), totaling $100,017. At 6.54% the same inputs total $99,961, about $39 short, so the break-even rate sits between the two.
Future value equals savings x (1+r)^years plus contributions x ((1+r)^years - 1) / r. The rate r appears both in the exponent and in the annuity factor, so no algebraic rearrangement can isolate it. The tool searches numerically instead: it tries a rate, computes the resulting future value, compares it with the target, and narrows the guess until the two match within a small tolerance.
Three assumptions hidden in the inputs change the answer: whether contributions land monthly or yearly, whether each one is added at the start or the end of the period, and whether the result is quoted per period or as an annual rate. Contributions that enter the account earlier earn longer, so monthly contributions need a slightly lower rate than the same total contributed once a year.
No. The tool computes the minimum return the plan requires; what markets actually deliver is unknowable. The number is best used as a reality check: if it comes out near or above the historical long-run return of the assets you hold, the plan needs larger contributions, more time, or a smaller goal.
Because the math makes every contribution earn from the day it is added. Monthly deposits spend more time in the market than a single year-end lump sum, so a smaller rate closes the same gap. Use whichever frequency matches when the money actually lands in the account, and keep it consistent across runs.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
Calculate gross, operating, and net profit margins from cost and revenue with breakeven analysis.
Convert between annual salary and hourly rate with adjustments for work hours, overtime, and benefits.
Calculate sales tax amounts, tax-inclusive and tax-exclusive prices for any tax rate or jurisdiction.
Calculate return on investment from initial cost and final value with annualized ROI and comparison tables.
Convert between markup and margin percentages, calculate selling price, and compare pricing strategies.
Convert numeric amounts to written words for invoices, checks, and legal documents in multiple currencies.