The Slayer model

http://puu.sh/1KRkD
The input should be self explanatory. Here you specify which tasks you do, block and cancel and how fast you kill the monsters. The default kills per hour are based on the fastest method to kill monsters, normally this means using a cannon, steel titan, overloads, prayers and abilities.
When changing which tasks are done and cancelled keep an eye on the E(Slayer points) output, this number is how many points you will gain on average per task assigned. If this is negative that means that the task list specified is not sustainable long term and you will lose points. You should aim to have a positive E(Slayer points) value unless you have excess points to get rid of. Players looking to optimise which tasks they block and which they cancel should look at the “Task logs” sheet to see how common each of the tasks that they wish to avoid are and block the most common of those to save points.
Input how many you kill per hour, you cannot simply put in your xp per hour but just use this to know when you have entered the correct kills per hour.

http://puu.sh/39BvT.png

The drops input allows you to choose what you want to do with drops such as charms and bones Outputs related to the drops inputs are shown here.
Options appear in a drop down box. Click the cell you want to change and click the small arrow beside the cell the make the list appear.

http://puu.sh/1KQdn

Choosing which minor drops you want to pick up is explained later.

http://puu.sh/39ByU.png

This interface allows you to choose what weapons you use for monsters of each weakness. The cost for runes, arrows and repairing weapons will be determined by what you put in here. You should note that changing weapon choices and such will not automatically update your kills per hour, these inputs are for calculating the cost of repairing weaons and the cost of ammunition.
Options appear in a drop down box. Click the cell you want to change and then click the small arrow that appears beside it to see the list.

http://puu.sh/1KQdn

Task frequencies are got from the knowledge base/official wiki here http://services.runescape.com/m=rswiki/en/Slayer_Master#Kuradal Those serious about conserving slayer points should look at the 'Task logs' sheet to see how common monsters are and block the most common of the ones you plan to not do.

The effigy drop rate of monsters is simply assumed to be 1/4 of the drop rate prior to the nerf. A formula for the drop rate before the effigy nerf was determined by xp-waste research and it was fairly accurate. Taking effigies to be 1 quarter the previous drop rate is not accurate but effigies are so rare and have little affect now that this isn't a big problem. I will however continue logging effigy drops to improve the accuracy of the formula.

Combat xp shown is based on an average gotten on task. In the combat input you can choose to get Ranged xp or Defence xp or Ranged and defence xp, and likewise for magic and melee. If you select to not use a steel titan this will adjust your ranged xp gain accordingly but it will always assume that you use a cannon (except for monsters in the polypore dungeon where a cannon isn't useful).

The amount of xp gotten from the herbicide is typically based off of a sample of 1000+ kills, more for tasks that drop a lot of herbs (e.g. Spectres), less for tasks that rarely drop herbs (e.g. Wyvern).

Charm drop rates are primarily based on Zarfot's slayer log because I believe he is a reliable source of information. Zarfot's log only shows drop rates of blue, crimson and green charms and so the drop rate of gold charms and the charm drop rates of monsters released after Zarfot quit are gotten from runescape wiki. When calculating the time you spend training summoning the model will check to see if you can complete your summoning goal using only blue charms- then crimson and blue ect and if you do not have enough charms it assumes you barrage dagganoth for the remaining xp at 200k summoning xp/hr.

Perhaps the most important part of the spreadsheet for many players is the predicted profits/losses of their task list. Players can select which drops they want to pick up in the “Drop selection” sheet. Enter either a 1 if you pick up the item or 0 if you don't. To begin with it is assumed that players pick up some but not all of the drops.

http://puu.sh/39BFN Example of the drop selection sheet

I log all drops of reasonable value most tasks, however cheap drops such as death runes from nechryael are based off of a small sample size as I am not bothered picking up every single drop- as are most players.

Each time I log a drop it will automatically update the drop log in your copy. The drop rate of the draconic visage is gotten from a thread on the runescape forums, they have a huge number of kills logged and I believe they are a reliable source of information.
Rare drop table drops can be a number of drops such as tooth half of key, 100 noted runite ore and uncut dragonstones.
Note that the price shown is for 1 of the dropped item but the monster might drop several at once.

For the overall profit figure the cost of cannonballs, scrolls, arrows, runes, repairing weapons and prayer potions are all included.