17 calculators: interest and a SIP, a lump sum, a fixed or recurring deposit, a loan payment, dates and working days, a percentage, a tip, a split check, and an adult BMI. Type a number and the result updates on the page. Nothing covers the form: no account, no popup, no extra step between the input and the figure.
Each money tool says whether a deposit lands at the start of the month or the end. Those rules are in how the math works.
Opening balance
$10,000.00
What is already there
Interest this month
$58.33
Rate ÷ 12, on the opening balance
Deposit
$200.00
Arrives at the end, so it does not earn yet
Closing balance
$10,258.33
The next month starts here
Interest, installments, and targets.
Distances on the calendar.
Percents, and splitting a bill.
A metric body mass index for adults.
The directory lists every calculator. A hub puts a few of them in the order a question is usually asked.
Five calculators, in the order you would actually use them. Each one keeps its own assumption. This page does not blend them into a single forecast.
5 stepsTip first if the bill is already one number. Use the split when tax and the tip base are separate lines.
2 stepsThe calendar difference and the working-day count are different questions. They stay on different pages so the headline is not doing two jobs.
4 stepsA monthly amount is not one calculation. Where the money lands in the month changes the result, and these pages do not hide that.
$10,000.00 to start, then $200.00 at the end of each month, at 7% for 10 years, finishes at $54,713.58. Interest is $20,713.58. That is the compound-interest page. A loan payment uses the same end-of-month timing, in the other direction.
Open compound interest$5,000.00 invested at the start of each month, at 12% for 10 years, finishes at $1,161,695.38. You invested $600,000.00. Growth is $561,695.38. A withdrawal plan takes money out on that same first-of-month clock.
Open the SIP calculatorDays from today starts at one date and walks forward or back. Use it for “what day is 90 days from 1 March?”
Days between dates only counts the gap. The order of the two dates does not change the number of days.
Age stops on a birthday. A 29 February birthday moves to 28 February in a year that is not a leap year.
A tip calculator takes one amount. A printed check has three: food, tax, and tip. On $86.00 of food, 8.875% tax is $7.63 and a 20% tip on the food is $17.20. Four people pay $27.71 each. The total is $110.83, which does not divide evenly, so rounding every share up to the next cent collects 1 cent.
Total
$110.83
÷ 4 = $27.71 each