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Calcimator

Float Management

Optimize payment timing to maximize interest earned. Use credit card grace periods and high-yield savings to earn more on your money between paychecks and bill due dates.

Inputs

$
%
days
$
days

Results

Optimized Monthly Interest

$22.45

≈ 4 cups of coffee

Annual Interest Gain

$44.40

≈ 9 cups of coffee

Current Monthly Interest$18.75
Optimal Checking Balance$1,500.00
How to Use This Calculator
  1. Enter your average checking account balance and your savings account interest rate.
  2. Set your credit card grace period in days and total monthly bills.
  3. Input the average number of days bills sit in checking before being paid.
  4. Review Optimized Monthly Interest vs Current Monthly Interest to see the gain from timing payments better.
  5. Check Optimal Checking Balance — keep only this amount in checking and sweep the rest to your savings account.

How the result changes with Savings Account Rate

Savings Account RateOptimized Monthly InterestAnnual Interest Gain
1%$4.99$9.84
3.5%$17.46$34.56
6.5%$32.42$64.08
9%$44.90$88.80

What each input means

Average Checking Balance
Typical balance sitting in your checking account
Savings Account Rate
APY on your high-yield savings account
Credit Card Grace Period
Days between statement close and payment due date
Total Monthly Bills
Total bills you can put on credit card or delay payment
Avg Days Bills Sit in Checking
How many days on average bill money sits idle in checking

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Average Checking Balance = 5000, Savings Account Rate = 4.5, Credit Card Grace Period = 25, Total Monthly Bills = 3000 = 5 input(s) provided
  2. Calculate Optimized Monthly Interest
    Optimized Monthly Interest
    22.45 = $22.45
  3. Calculate Annual Interest Gain
    Annual Interest Gain
    44.4 = $44.4
  4. Calculate Current Monthly Interest
    Current Monthly Interest
    18.75 = $18.75
  5. Calculate Optimal Checking Balance
    Optimal Checking Balance
    1500 = $1,500

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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