What This Calculator Does
The Future Inflation Rate Calculator shows how the cost of money grows over time when prices rise at a steady annual rate. Enter a dollar amount today, an expected annual inflation rate, and a number of years, and the tool projects what that same amount will cost in the future. It is useful for anyone planning long-term savings, retirement, education funds, or major purchases, and the dollar sign is just a label — the maths works for any currency.
The Three Inputs
- Present Value ($): the amount of money or cost you are starting with today.
- Annual Inflation Rate (%): the average yearly rate at which prices are expected to increase.
- Time Period (Years): how many whole years into the future you want to project.
The Formula
The calculator uses standard compound growth:
Future Value = Present Value × (1 + Inflation Rate / 100)Years
From that result it also reports three extra figures:
- Total Increase = Future Value − Present Value
- Percentage Increase = (Total Increase ÷ Present Value) × 100
- Average Yearly Increase = Total Increase ÷ Years (a simple dollar average, not a compounded one)
Worked Example
Suppose you enter a Present Value of $10,000, an Annual Inflation Rate of 3%, and a Time Period of 10 years.
- Future Value = 10,000 × (1 + 0.03)10 = 10,000 × 1.3439 = $13,439.16
- Total Increase = 13,439.16 − 10,000 = $3,439.16
- Percentage Increase = (3,439.16 ÷ 10,000) × 100 = 34.39%
- Average Yearly Increase = 3,439.16 ÷ 10 = $343.92 per year
In other words, something costing 10,000 today would cost roughly13,439 in a decade if inflation averages 3%.
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輸入各項數值時請務必確認量綱（例如小時、天數、金額、百分比），避免單位不匹配引發推算偏差。
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所有計算邏輯 100% 在您的終端瀏覽器內完成，資料絕不上傳伺服器，嚴格守護商業與個人隱私。
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演算法嚴格遵循國際通用數學公式與標準計算模型，經多重情境交叉核對，數值嚴密精確。
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支援一鍵複製推算結果字串至剪貼簿，亦可直接點擊列印按鈕輸出純淨 PDF 工作報表。
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建議針對極端值與多組預期情景分別試算，觀察輸出數據的波動區間，輔助做出更穩健的決策。
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本工具運算結果供日常排程、學業研習與事前參考之用，如涉及重大法規或投資決策請諮詢持證專家。