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Weekly Compound Interest

Quick answer

A = P(1+r/52)^(52t): 5,000 at 6% compounded weekly grows to ≈5,986 in 3 years — beating annual compounding by ≈15.

  • Results update as you type.

Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.

How the Weekly Compound Interest Calculator Works

A = P × (1 + r ÷ 52)^(52 × t)

Weekly compounding credits interest 52 times a year, so each week's interest starts earning immediately. The calculator projects the balance for any principal, rate and horizon on that basis. Mathematically, the engine applies A = P × (1 + r ÷ 52)^(52 × t). A 5,000 deposit at 6% nominal for 3 years becomes 5,000 × (1 + 0.06/52)^156 ≈ 5,986 — versus 5,955 with annual compounding, a ≈15 advantage purely from frequency. Everything you enter stays in your browser, and the answer appears in the same units as your inputs the moment the figures are complete.

  1. 1

    Step 1

    Fill in each input field with your own data.

  2. 2

    Step 2

    The tool runs the formula A = P × (1 + r ÷ 52)^(52 × t) on your figures.

  3. 3

    Step 3

    Review the result displayed on screen.

  4. 4

    Step 4

    Refine the inputs until the numbers fit your case.

Use Cases

Account comparison

Testing weekly vs monthly quotes on the same balance

Short-term deposit sizing

Projecting a 1–3 year parking place

Rate sensitivity

Seeing the frequency edge at different rates

Teaching compounding

Demonstrating frequency effects with round numbers

Common Mistakes

  • Comparing nominal rates across frequencies

  • Expecting weekly magic

  • Misreading the exponent

FAQs

How much better is weekly than monthly compounding?

Marginally: on 5,000 at 6% over 3 years, weekly pays ≈5,986 vs ≈5,984 monthly — the meaningful jump is from simple to any compounding.

Which products compound weekly?

Some savings accounts and crypto lending platforms; most bank products use daily or monthly — check the stated APY.

Which equation powers the Weekly Compound Interest Calculator?

The underlying equation is A = P × (1 + r ÷ 52)^(52 × t), where r is the nominal annual rate and t the years held.

How do I know the result is right?

The Weekly Compound Interest Calculator uses the standard closed-form formula shown above; the accuracy depends only on the figures you supply.

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