Quick math question.

[NothinG]

If you want me to change the math around, give me a formula to work with.
So far everyone keeps saying my math is wrong.

[1714122712]

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[Elwar]

Looks fine. You just do a $fee / 1000

Which is screwy since you have the decimal specified before the input.

So someone putting in: .60 and someone putting in .6 would end up with
60 / 1000
and
6 / 1000

Two very different numbers.

I am not sure how to add a decimal before a number in php.

[NothinG]

Looks fine. You just do a $fee / 1000

Which is screwy since you have the decimal specified before the input.

So someone putting in: .60 and someone putting in .6 would end up with
60 / 1000
and
6 / 1000

Two very different numbers.

I am not sure how to add a decimal before a number in php.

I forgot I could divide with decimals.
[/fail]
http://zombietoday.com/trade_calculator.php?volume=1&ppb=9.905165356&liveppb=on&bfee=0.3&sfee=0.3
http://zombietoday.com/trade_calculator.php
xD

[Vandroiy]

Profit criterion:

Buy price * (1 - commission fraction)^2 > sell price

Just use Wolfram Alpha when you have a browser around. For simple calculations, it responds quickly in JavaScript.

[Ellen Alemany]

I buy 10 bitcoins at $10 each, cost is $100 plus $0.65 commission.
I sell 10 bitcoins at $10.12 each, I get $101.20 and pay $.55 commission.

It is not reasonable that for a larger transaction the commission is lower, it should be the other way around so there is a mistake here?
---

If f is the fee, B is the buying price and S is the selling price then break even is found when S/B = (1+f)/(1-f) since:
Our income = -B*(1+f) + S*(1-f) > 0 => S/B > (1+f)/(1-f)

In the case 0.003 and 0.0065 we get 1.00601805 and 1.01308505.

In other words, if you buy at $10, you sell at $10*1.01308505 or roughly $10.13.

[phorensic]

What's funny is I have been using the dang Windows calculator do this for weeks and I have been wondering: "I wonder if someone has made an online app for this?"  Prayer answered!  Thank you sir

[NothinG]

What's funny is I have been using the dang Windows calculator do this for weeks and I have been wondering: "I wonder if someone has made an online app for this?"  Prayer answered!  Thank you sir

No problem.
I added JSON
http://zombietoday.com/trade_calculator.php?volume=1&liveppb=on&json=on&bfee=0.3&sfee=0.3

Simple usage for JSON in PHP?

Code:

<?php
echo minSell();

function minSell($volume=1,$ppb="live",$bfee=0.3,$sfee=0.3)
{
	$url = "http://zombietoday.com/trade_calculator.php?";
	$url .= "volume=".$volume;
	if($ppb=="live")
		$url .= "&liveppb=on";
	else
		$url .= "&ppb=".$ppb;
	$url .= "&bfee=".$bfee;
	$url .= "&sfee=".$sfee;
		$json = file_get_contents($url."json=on");
	$obj = json_decode($json);
	return $obj->{'mmsppb'};
}
?>

Like it?
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[Bitcoin Swami]

Thanks alot man, you should put your donate address on the page.

I will donate when I mine a few more.

Glad other people think this was a good idea too!

Mike

[NothinG]

Thanks alot man, you should put your donate address on the page.

I will donate when I mine a few more.

Glad other people think this was a good idea too!

Mike

Thanks, added to the page.

If anyone has something I should add, let me know.

[Tasty Champa]

Thanks alot man, you should put your donate address on the page.

I will donate when I mine a few more.

Glad other people think this was a good idea too!

Mike

Thanks, added to the page.

If anyone has something I should add, let me know.

other way around. like how much money equals bitcoins minus fee.

[NothinG]

Thanks alot man, you should put your donate address on the page.

I will donate when I mine a few more.

Glad other people think this was a good idea too!

Mike

Thanks, added to the page.

If anyone has something I should add, let me know.

other way around. like how much money equals bitcoins minus fee.

I don't understand.

[dub0matic]

doesnt work to good. i just use mtgox calculator. but good job anyways

[NothinG]

doesnt work to good. i just use mtgox calculator. but good job anyways

How does it not work too well?
What's wrong with it?

[dub0matic]

doesnt work to good. i just use mtgox calculator. but good job anyways

How does it not work too well?
What's wrong with it?

you cant change the price

[Elwar]

doesnt work to good. i just use mtgox calculator. but good job anyways

How does it not work too well?
What's wrong with it?

you cant change the price

You can change the price. Just turn off the options to the right of price.

Also, I finally saw on MtGox that they are saying .65% per trade on the trade page.

[GeniuSxBoY]

Mine says Mt Gox charges a small fee (0.43 %) for each trade.


I'm so confused lol

[Elwar]

Bump for a useful tool.

Thank you!