What is compound interest and why does it matter?

Compound interest is interest calculated on both the initial principal and previously earned interest. The formula is A = P(1 + r/n)^(nt), where n is the compounding frequency. Daily compounding yields more than annual compounding because interest is added more frequently.

How much should I keep in an emergency fund?

Financial experts generally recommend 3–6 months of essential living expenses in an emergency fund. If you have variable income, a family, or work in an unstable industry, aim for 6–12 months. Keep it in a high-yield savings account, separate from your regular checking.

What is the difference between APY and APR?

APR (Annual Percentage Rate) is the simple annual rate without compounding. APY (Annual Percentage Yield) reflects the actual return when compounding is included. For savings accounts, APY is always higher than or equal to APR — and is the more meaningful rate to compare.

What is the Rule of 72?

The Rule of 72 is a quick mental math shortcut: divide 72 by your annual interest rate to estimate the years needed to double your investment. At 6%, money doubles in roughly 12 years. It's most accurate for rates between 2% and 20%.

9 free calculators

Free Savings Calculators 2026

Grow your money with compound interest, savings goal, CD, and emergency fund calculators.

Browse Calculators How to Use

All Savings Calculators

9 calculators

Cost of Waiting to Invest Calculator

Compare investing now with starting later at the same end date. Separate missed contributions from the difference in compounded growth.

What changes if I start investing later?
Worked example and formula
Adjustable scenario presets

Compare scenariosUse Calculator

Real Return After Inflation Calculator

Convert nominal investment returns into inflation-adjusted returns and purchasing power. Compare future dollars with today's dollars.

Is my money growing faster than prices?
Worked example and formula
Adjustable scenario presets

Compare scenariosUse Calculator

Compound Interest Calculator

Popular

Calculate how your savings grow with compound interest across different compounding frequencies.

Daily/monthly/quarterly/annual compounding
Regular contribution option
Growth line chart
Total contributions vs. interest

$16,288 finalUse Calculator

Savings Goal Calculator

Popular

Find out how much you need to save each month to reach your financial goal on time.

Monthly contribution required
Time to reach goal
Interest rate adjustment
Target date planning

$342/mo neededUse Calculator

Future Value Calculator

Calculate the future value of an investment with optional periodic payments.

Future value with periodic payments
Year-by-year growth table
Multiple compounding frequencies
Present to future value projection

$2,158.93Use Calculator

Present Value Calculator

Determine what a future sum of money is worth in today's dollars using a discount rate.

Present value calculation
Discount factor table
Multiple period analysis
Investment decision support

$743.29 todayUse Calculator

CD Calculator

Calculate your Certificate of Deposit earnings with a month-by-month growth table.

APY and compounding calculation
Ending balance and interest earned
Month-by-month table
Effective APY display

$10,511.62 after 1yrUse Calculator

Emergency Fund Calculator

Popular

Calculate your target emergency fund amount and how long it will take to reach it.

Target fund calculation
Savings gap analysis
Months to reach goal
Coverage period selector

$21,000 targetUse Calculator

Rule of 72 Calculator

Use the Rule of 72 to quickly estimate how long it takes to double your money at any interest rate.

Quick doubling time estimate
Exact doubling time comparison
Rate-to-time or time-to-rate
Visual estimate vs. exact

9 years at 8%Use Calculator

Savings Guides

The Power of Compound Interest

Einstein called it the eighth wonder of the world. See how compounding frequency (daily vs. annual) affects your long-term savings.

5 min read

Building an Emergency Fund: How Much Is Enough?

Most financial experts recommend 3–6 months of essential expenses in a liquid emergency fund. Here's how to calculate your target.

4 min read

CDs vs. High-Yield Savings Accounts

CDs offer higher rates but lock up your money. HYSAs offer flexibility with competitive rates. Learn which is right for your savings goals.

5 min read

Rule of 72: Quick Mental Math for Investors

Divide 72 by your interest rate to estimate how many years it takes to double your money. It's surprisingly accurate for typical rates.

3 min read

Compare Savings Calculators

Name	Best For	Complexity	Key Feature
Compound Interest	General savings/investment growth	Simple	Compounding frequency selector
Savings Goal	Saving toward a specific target	Simple	Required contribution calculator
CD Calculator	Certificate of deposit returns	Simple	Month-by-month table
Future Value	Investment projection with payments	Moderate	Year-by-year growth table

Frequently Asked Questions

Built on trust

Why Use MoneyCalc?

Free tools with explained assumptions

No Account Required

MoneyCalc calculators run entirely in your browser. Some tools save settings locally on your device.

100% Free

All calculators are completely free to use. No subscriptions, no hidden fees, no paywalls.

Transparent Estimates

Read the formula, assumptions and model limitations alongside each calculator.

Works on Any Device

Optimized for mobile, tablet, and desktop. Calculate on the go from any browser.

Related Categories

Retirement

Plan your retirement with 401(k), IRA, nest egg, annuity, and RMD calculators.

Budgeting

Build a better budget with net income, net worth, 50/30/20, inflation, ROI, and investment growth tools.

Other Calculators

Handy financial tools: APR, effective interest rate, car affordability, tip splitter, and more.