Time-to-buy
Calculate Time-to-buy instantly with the exact formula and a worked example.
Time-to-buy
Purchase price$
Already saved$
Saved per month$
Income per month$
Working hours per monthh
Months to buy
10months
Still to save
100000$
Work hours for the purchase
240h
Share of monthly income
150%
More about: Time-to-buy
What it calculates
The “Time-to-buy” calculator computes Months to buy in months from 5 parameters: purchase price ($), already saved ($), saving per month ($), monthly income ($), working hours per month (h).
Used by investors to estimate returns, project savings, and analyze a portfolio.
Example calculation
With parameters Purchase price = 120,000 $, Already saved = 20,000 $, Saving per month = 10,000 $, Monthly income = 80,000 $, Working hours per month = 160 h the result is 10 months.
How to use
- Enter purchase price, already saved, saving per month, monthly income and working hours per month — each field above is adjustable with a slider.
- Months to buy (months) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
What is compound interest?
Compound interest means you earn returns not only on your original principal but also on previously earned interest. Formula: A = P · (1 + r/n)^(n·t). Over long periods this produces exponential growth.
How much do regular contributions matter?
A lot. Adding a fixed amount every month and reinvesting earnings dramatically increases the final value, especially over 20–30 years, because each contribution compounds for the remaining term.
What is the Rule of 72?
A quick estimate for doubling time: years ≈ 72 / annual return %. At 8% your money doubles in about 9 years; at 12%, in about 6 years.
What return rate should I assume?
Historically the S&P 500 has returned about 10% per year before inflation (around 7% after). Use a conservative figure for planning and remember that past performance does not guarantee future results.
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