A generic tag to understand the calculations in a specific case. Please give out a sample illustration and ask a specific question. Ideally should also be accompanied by specific subject tags like "credit-cards", "savings-account", "index-funds" etc.

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3
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2answers
2k views

Calculating Profit Ratio (Gross Margin)

When looking at a company's income statement to calculate the Profit Ratio (Gross Margin) PM = Net Profit / Sales Do you include "other" revenue in the equation? Example: XYZ Ltd Income Statement ...
2
votes
1answer
237 views

How do I calculate the interest on my deposits to my landlord?

I was renting from this company called harbor house builders. I started renting from them in 2009 and at that time I was renting an apartment at 650 a month so I put 650 for rent and 650 for deposit. ...
7
votes
3answers
1k views

How do you do inflation calculations and estimates?

I'm an engineer, not an accountant so I have no idea what formulas to use (or even the proper terms to google for). I've looked around on a couple of google results, but most of the explanations just ...
10
votes
1answer
9k views

“Out of Pocket Maximum” and health insurance plan terminology & calculation?

I'm trying to understand the terminology on my health plan. I've read numerous websites, which have only confused me more, as they fail to use examples (more than one should be required) for people ...
2
votes
2answers
961 views

What is the effective interest rate on a credit card that offers 0% interest with a 4% balance transfer fee?

I'm about to do a balance transfer that has a fee of 4%. It gives me 0% interest for 14 months. Is it just a straight calculation of 4% for the year or is there another calculation that I need to ...
4
votes
1answer
3k views

Calculating the profit earned from a leveraged futures contract

How do we calculate the profit/loss of Futures contract? For example, If I had a Futures contract that had $10 000 as the underlying, it had $1000 margin and the Futures contract itself was worth $3. ...
5
votes
3answers
349 views

Dealing with fractions of a penny

If my car insurance was £1200.01 per year, I could end up being charged £100 + 1/12p per month. I know that's not how it works, the extra penny is kept whole and goes on a specific month instead. ...
9
votes
4answers
404 views

How do you go about calculating how much you need after retirement?

I am posting this question after reading this article on WSJ, where it says: Just 42% of working-age Americans have even tried to calculate what they will need in retirement, according to the ...
7
votes
2answers
1k views

Continuous compounding in practice

A common explanation for the mathematical constant e (2.71828...) is that it is the factor by which an investment would grow at 100% interest rate over a period if it is continuously compounded. In ...
1
vote
1answer
208 views

Find monthly interest rate from principal, monthly payment, and loan's term?

Is there a formula to find the monthly interest rate required on a compounded interest fixed-rate mortgage loan, given the principal, the monthly payment, and the loan's term?
1
vote
1answer
481 views

Rate of return of stock index

One can always see on the news for example, the movement of stock indexes. Say for example: S&P +5.15 (0.05%) or S&P -0.57 (0.001%) But how would I calculate the 2 numbers above? (+5.15 and ...
4
votes
1answer
2k views

What does the “SEC 30-Day Yield” mean for a Bond ETF?

I'm currently a student awaiting admission into grad school and have about $10,000 in a Scott Trade account ready to invest. Because I'll be using the money to pay for moving expenses and anything ...
2
votes
3answers
416 views

Rules of thumb for present value of retirement funds given current age and income?

I know the general rule of thumb is you should save 15% of income to retirement, but I'm playing catch-up after years of neglect and contributing 25% until I catch up again. But how will I know when ...
6
votes
2answers
197 views

Help understanding credit card interest

I have a credit card with an outstanding balance and I am trying to work out when I will complete paying it off. It is a UK credit card (where I am based) and I do not spend on it. I pay 150 per ...
4
votes
1answer
434 views

How to determine the interest rate?

I'm really not good at math. So please forgive me for this noob question that I have.. Just trying to learn basic percentage calculation with money lending.. Here's an example of how the APR ...
1
vote
2answers
305 views

Having trouble with APR calculation

I am using the formula listed on the following site to try to calculate APR: http://www.fdic.gov/regulations/laws/rules/6500-1950.html#fdic6500appendixjtopart226 go to appendix J, if it doesn't auto ...
2
votes
4answers
9k views

Is there a mathematical formula to determine a stock's price at a given time?

I have been trying to find exact information on how stock prices are determined but still I haven't found any exact mathematical formulas how it happens. Wikipedia states: When prospective buyers ...
3
votes
2answers
464 views

How are minimum payments calculated for auto loans, education loans, etc.

I'm working on a calculator and I have a good handle on Mortgages (amortization) and Credit Cards (daily average, apr, multiply between 3-5%), but I'm not sure how to calculate minimum payments for ...
4
votes
2answers
4k views

What is the equation for an inflation adjusted annuity held in perpetuity?

What is the equation relating an initial investment, a fixed rate of return, an inflation rate, and a perpetual payment adjusted for that inflation rate?
-1
votes
1answer
164 views

fixed income calculator

where can I find a fixed income investment calculator? How much income can I expect monthly if I try to live off the interest alone? Are there any penalties for switching investment strategies?
1
vote
1answer
191 views

Calculate APR for under 1 year loan

I was talking with a friend about Payday loans (neither of us is getting one, just merely curious) and the APRs they state aren't really true. So, I was trying to figure out an APR based on the ...
1
vote
1answer
603 views

How to calculate lump sum required to generate desired monthly income?

Suppose my monthly expenses are $500. I want to ask a charity foundation to finance my scientific research by one-time payment intended to cover all my monthly expenses during my lifetime. How to ...
4
votes
2answers
395 views

Formula to decide when to break a Certificate of Deposit (CD)?

I'm trying to create a certificate of deposit (CD) comparison tool and have been working on a formula to compare a CD with a higher interest rate to a CD I might own with a penalty period. I believe ...
2
votes
4answers
2k views

How to calculate money needed for a retirement based on an hypothetical death date & expenses?

I would like to know what formula or tool I need to use to calculate the capital needed for a hypothetical retirement that will start at date X and end at date Y. Here is an example: Variable1 = ...
2
votes
1answer
153 views

How to calculate outstanding Graduate Plus Loan balance currently in deferment?

Can someone tell me what I'm doing wrong here? If I have a $56,500 loan and the interest rate is 7.9% how much will I owe after 8 months? I thought this would be fairly simple. I would ...
3
votes
3answers
10k views

How to calculate stock price (value) based on given values for equity and debt?

If a company has $80 million in equity and $20 million in debt, this means that total firm value = D + E = $100 million. Am I then right to assume that if there are 1 million shares outstanding, then ...
7
votes
5answers
45k views

How do I calculate net monthly salary (after taxes) in Germany?

If I were to say that my yearly, gross salary was 50,000 euros, then what would be my monthly net after-tax income? For example, this calculator looks OK to me: ...
4
votes
2answers
789 views

How does the Dow Jones Industrial Average (DJIA) divisor change to account for dividends?

The DJIA is a price-weighted index tracking of 30 companies chosen by the Dow Jones Company. It takes the current share price of these 30 stocks and divides by a specific number called the divisor. ...
7
votes
3answers
2k views

Is interest of credit cards caculated based on the amount unpaid within the grace period?

From Wikipedia if a user had a $1,000 transaction and repaid it in full within this grace period, there would be no interest charged. If, however, even $1.00 of the total amount remained ...
0
votes
2answers
461 views

Formula for recalculation of a bad loan, i.e. where payments were missed?

I need to know if exists any formula to calculate interest rate, principal interest, total amount to be paid, in the case of a bad loan. Ex: In a bank exists a 20 year home - loan. The client was ...
2
votes
3answers
4k views

How is interest in my bank account calculated?

I am a software professional. I have one question. How do banks calculate interest on money deposited, if I get, say, 10 % per annum? Say I deposit say RS.1000 on the 1st day of the month; then I ...
-1
votes
1answer
237 views

What's the Effective Interest formula used by this loan calculator?

I used a loan calculator which gives an effective rate of 80.781 whereas wikipedia http://en.wikipedia.org/wiki/Annual_percentage_rate gives a rate of 49% for these parameters: borrowed: 100 fees: ...
11
votes
2answers
25k views

How to determine contractor hourly rate and employee salary equivalents?

I am aware of the general differences between being an employee and being an independent contractor. However, I am unable to easily compare the two when it comes to after-tax compensation. Company ...
0
votes
2answers
1k views

How much is my annuity worth? Calculating present (commuted) value of an annuity or pension?

I have a lifetime annuity which adjusts with cost of living increases in my state. Is it possible to compute the present value of this annuity? If so, how might I go about that? Perhaps I am ...
4
votes
1answer
66 views

Should you work out the yield on property or shares against the purchase price, or the current market price?

In What is a good rental yield?, there's some discussion about whether you should calculate yield by dividing the original purchase price, or the current market price. Which is the correct ...
7
votes
2answers
421 views

Correct calculation for determining real business book value per share?

I'm trying to calculate the real value of a business and, as an example, I picked Netflix. From their latest financial statements I can see that: Assets value is: $3,065,709,000 Liabilities value ...
4
votes
2answers
3k views

How is my 'Personal Investment Performance' on my 401(k) calculated?

My 401(k) shows the following: my starting value at the beginning of the year personal contributions employer contributions investment gains/losses Closing value from Yesterday Total Change ...
4
votes
1answer
2k views

How can I calculate a “running” return using XIRR in a spreadsheet?

I should say that I'm not married to XIRR, I just want to calculate the return on a running basis in a column next to dates, deposits and balances. Here's a screenshot of a simplified spreadsheet in ...
9
votes
3answers
2k views

Buying a more expensive house as a tax shelter (larger interest deduction)?

I've heard that some people buy a more expensive house as a tax shelter. In my simple mind I imaging the scenario: Pay 10,000 annual interest on the mortgage 50,000 annual income = 40,000 ...
1
vote
2answers
2k views

How to determine duration of a common stock whose dividends grow in perpetuity?

What is the duration of a common stock whose dividends are expected to grow at a constant rate in perpetuity? Specifically, how can I compute this, since the dividends will grow forever? Update: ...
2
votes
6answers
2k views

Help me understand the oddity of percentage gains and losses?

If you start with $100K, and you get a 50% gain, it's $150K. Then, you get a 50% loss: now it's $75K. Reverse the order (i.e. lose 50%, gain 50%), it's the same thing (a 25% loss). So, 50% up then ...
0
votes
1answer
30 views

Understanding company pension plan monthly purchase of funds

A pension based on funds. What does it mean to add £500 a month to a pension based on funds? Does that mean, I will own an additional £500 worth of that fund each month based on how much of the fund ...
2
votes
2answers
111 views

Calculating the cost of waiting longer for money

I'm trying to calculate the cost of waiting 30 extra days to receive money from a customer. Here's the situation: How much would this cost a company per year if a customer pays us in 60 days vs. ...
5
votes
2answers
602 views

Is there a dollar amount that, when adding Massachusetts Sales Tax, precisely equals $200?

I am confused about calculating Massachusetts Sales Tax (6.25%). Is there such an amount, that when added to its sales tax, equals $200? The reason I ask is because my business has been charging ...
0
votes
2answers
166 views

How many stocks will I own in n years if I reinvest my dividends?

Let's say that I own 1000 shares of a stock at 20$. Every quarter, I get a dividend of 0.20$ which is reinvested (buy more of the same stock). Considering that the stock grows 5% annually, how many ...
9
votes
5answers
928 views

For net worth, should I value physical property at my cost to replace it, or the amount I could get for selling it?

I recently was a good little consumer and picked up a relatively expensive set of new home furnishings, some furniture, a TV, some other electronics ... items of that nature (don't worry, been ...
5
votes
2answers
645 views

Calculating savings from mortgage interest deduction vs. standard deduction?

I've read just about anything I can find on comparing cash-flow between owning a house versus renting. One new thing popped into my head yesterday, and I can't shake the feeling that it's an obvious ...
12
votes
2answers
16k views

Daily interest calculation combined with monthly compounding: Why do banks do this, and how-to in Excel?

I often see banks advertise (for accounts with fixed yearly interest, let's say 1.5%) – "interested is calculated daily, and compounded monthly". I have 2 questions: Why are they calculating ...
8
votes
2answers
273 views

How do I account for newly added money when computing my rate of return?

I have a simple spreadsheet where I track the balance in my investment account. What should I do to handle new deposits in the account? For example: End of Day 1: balance = $100 End of Day 2: ...
2
votes
1answer
285 views

What does “average revenue growth” over multiple periods of time mean?

In particular, given 10 years of revenue data, what is "average revenue growth" understood to mean? The arithmetic average of the 9 yearly growth rates The geometric rate of return Something else No ...