31 posts tagged with calculation.
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How do I calculate combined percentages?

Mathfail: I'm considering supplementing my cat's food with plain meat. I'd like a rough idea of how much it would bump percentage of calories from protein and fat. [more inside]
posted by moira on May 10, 2014 - 6 answers

How do i determine the wall thickness of a Cylinder if it gets expanded.

I would like to use a mathematical formula in Excel to try and determine how much the wall thickness of a Cylinder or tube changes if it is expanded. [more inside]
posted by ndillon on Feb 27, 2014 - 11 answers

Math/Physics Question: Stability of an abruptly stopped object

If you have an object with a given base length and a given CG height, how fast can it travel before you have to worry about it running over an obstacle and falling over? [more inside]
posted by Popular Ethics on Mar 5, 2013 - 16 answers

Can someone explain how IRA early withdrawal penalties are calculated?

Everywhere mentions a 10% penalty, but nobody says whether this is pre or post tax, or whether it's added to your existing tax burden, or how these taxes actually get paid, etc. [more inside]
posted by tylerkaraszewski on Jan 24, 2013 - 7 answers

Perspective drawing calculation

If I want to draw something in one-point perspective, say, like a set of railroad tracks where the vanishing point is on the horizon, and the tracks are represented on the picture plane by an equilateral triangle (they appear that way to the viewer), the apex of the triangle being the vanishing point on the horizon and the base of the triangle is where the tracks meet the picture plane, how do I calculate where the railroad ties would be? (Given that in 3D they are evenly spaced. Also, I'm not really concerned with the thickness of the ties -- we can consider the ties to simply be horizontal lines.) [more inside]
posted by strangeguitars on Jan 8, 2013 - 5 answers

Help me improve the ASA fitness classification system

The ASA physical status classification system is used by anaesthesiologists, surgeons and epidemiologists the world over. It has a major flaw - it makes no odds whether index patients have 1 or 5 systemic diseases: only the leading/worst is counted. This has the advantage of simplicity but is potentially misleading and should be done better in the 21st century. Numbercrunchers with a biomedical background needed ... [more inside]
posted by kairab on Nov 9, 2012 - 4 answers

Math Geeks!! Assistance needed!!

How should a surcharge be calculated? [more inside]
posted by elf27 on Jun 7, 2012 - 11 answers

Calculate Electric Cost

How much does my refrigerator cost to run per month? The info tag on the inside reads; 110-127 VAC, 60 HZ, 11.2 AMPS. It runs 24/7 and my NYC electric is charged at .1999 per KWH. Including the calculation in your answer would be appreciated. Thanks.
posted by mbx on Nov 13, 2011 - 15 answers

What would the check-digit be on this string: K1506235620?

What would the check-digit be on this string: K1506235620? [more inside]
posted by JPigford on Sep 12, 2011 - 6 answers

Tell me I'm not cheap!

Do you calculate your waiter's tip based on the pre-tax or the with-tax total? [more inside]
posted by just_ducky on Dec 5, 2010 - 76 answers

Shipping charges

Online payment system with integrated shipping charges calculator? [more inside]
posted by yoyo_nyc on Nov 2, 2010 - 3 answers

What do you call similarity calculation?

what do you call the science/math for calculating similarity between people based on survey results (like OK Cupid)? [more inside]
posted by lrivers on Sep 14, 2010 - 12 answers

mySql query assistance, please!

mySQL query question about calculating percentages in a table. [more inside]
posted by omnipotentq on Sep 5, 2010 - 3 answers

Figuring interest at a per-month rate, compounded monthly

Mathfilter: How do I figure the total value of interest at a per-month rate, compounded monthly, with monthly contributions? [more inside]
posted by AV on Jun 9, 2010 - 17 answers

Birth year confusion

Can I conclusively determine a birth year from these two data points? [more inside]
posted by activitystory on Apr 5, 2010 - 3 answers

What is a Fair Interest Rate for Money Loved Ones Lent You With No Interest Rate Specified?

Despite the lender explicitly loaning me something interest-free and with no firm repayment date, I would like to offer a fair interest rate when I am able to repay them in the future. I'd like your help in figuring out what that rate would be, and your confirmation that I am applying the concept of compound interest correctly. [more inside]
posted by anonymous on Feb 25, 2010 - 14 answers

"I'll Calcu Later!"

I've seen people compute complex arithmetic off the top of their head. How do they do it? [more inside]
posted by Christ, what an asshole on Apr 30, 2009 - 13 answers

Math question

Math problem with shipping rates. Can a maths whiz point me in the right direction? [more inside]
posted by dydecker on Apr 14, 2009 - 11 answers

Need an instant quote web form that instantly calculates quotes!

Does anyone know of a php script that can be used to easily generate a web form, and that can have a "calculation" box at the bottom, that will calculate a cost based on the previous response fields? [more inside]
posted by thewibbler on Apr 1, 2009 - 6 answers

Yet another excel question!

I have an Excel question that I'm not sure how to search the archives for. [more inside]
posted by pdb on Nov 4, 2008 - 4 answers

What equation should I use to calculate the number of miles in a degree of longitude for a given latitude?

What equation can I use to calculate the number of miles in a degree of longitude for a given latitude? [more inside]
posted by Glendale on Aug 19, 2008 - 9 answers

creating circles from rectangles

Math filter: How many equally sized rectangles will fit into a circle, and how should I arrange them in order to make the best-looking approximation? [more inside]
posted by brandnew on Aug 17, 2008 - 9 answers

Old Car: How to decide on repair vs. replace?

I drive a 1992 Toyota Camry with just over 203,000 miles on it. As far as I know, the car is in good mechanical condition except that the rear struts are in fairly desperate need of replacement. How do you calculate the payback period for repairing an old but paid-off car, and how might you use this information to help decide whether to repair the car or buy a newer used car? [more inside]
posted by Juffo-Wup on Jul 18, 2008 - 20 answers

Using a Database for analysis of temperatures

I've got an interesting question about MS Acess. It involves using lat/long data... Anyone care to help? [more inside]
posted by dance on Nov 2, 2006 - 15 answers

How do I calculate GPP on goods sold?

How do I calculate Gross Profit Percentage (GPP) on goods I sell? [more inside]
posted by tomble on Sep 9, 2006 - 2 answers

Excel master needed...where to find one?

I run a computer service. I have an issue that is a bit outside the bounds. I have a client who has been using an Excel spreadsheet to track his portfolio. It is pre-formatted for him to enter data and the formulas are all there. Just recently, it started calculating some things incorrectly. The person who originally set it up just passed away earlier this year. We need an Excel expert that can look at the file and don't know where to begin to find one. Checked the local community college but no dice. All ideas or pointers are appreciated.
posted by titans13 on Aug 17, 2006 - 11 answers

drill press force multiplier?

Power Tool Filter: Is there some kind of 'force multiplier' in effect when using a drill press? i.e. when you put two pounds of pressure on the handle, is there more pressure applied to the work surface? Perhaps most importantly, how hard would this be to calculate? [more inside]
posted by schwap23 on Jul 18, 2006 - 6 answers

How can the energy cost of an electronic device over a span of time be calculated?

How can the energy cost of an electronic device over a span of time be calculated?
posted by airguitar on Feb 21, 2006 - 6 answers

Calculate ambient light level?

How can I calculate the ambient (natural) light level for a particular location and time? [more inside]
posted by orthogonality on Nov 22, 2005 - 9 answers

calories and acting

Myth or truth?: You burn as many calories playing a major theatrical role (i.e. "Hamlet") as you do running a marathon. And how DO you calculate calories, anyway? [more inside]
posted by grumblebee on Jul 8, 2005 - 20 answers

How does my pocket calculator do this?

How does my pocket calculator do this? [more inside]
posted by Termite on Mar 28, 2004 - 6 answers

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