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Expected value math, supplies included.
OSRS GP per Hour Calculator
A boss is only a good money maker if the math says so. Enter your kill speed, supply costs, and the drop table to get your expected GP per kill and profit per hour.
-Expected GP per kill
-Gross GP per hour
-Supply cost per hour
-Net GP per hour
The expected value formula
Each drop contributes its value divided by its rarity to the average kill: a 3,000,000 GP drop at 1/512 is worth 5,859 GP per kill on average. Add up every drop in the table, multiply by your kills per hour, and subtract your supply costs. That is your expected GP per hour: GP/hr = kills/hr x sum(value / rate) - supplies/hr.
Why averages lie (a little)
Expected value is a long-run average. In any single hour, one rare drop can double your profit or its absence can halve it. Use the OSRS drop rate calculator to see how swingy a session can be before you commit to a 10-hour grind.
Worked example
60 kills per hour, supplies 200,000 GP/hr, drops: 1/512 x 3,000,000 GP, 1/128 x 150,000 GP, guaranteed 12,000 GP. Per kill: 3,000,000/512 + 150,000/128 + 12,000 = 19,031 GP. Gross = 60 x 19,031 = 1,141,875 GP/hr. Net after supplies = 941,875 GP/hr.
Check the XP too
Profit is only half the story at most bosses. The OSRS XP calculator tells you how much XP the same grind earns, so you can weigh GP against levels before picking your next money maker.
Planning estimate only. Results use the list prices shown and may differ from your actual bill. Terms
Frequently asked questions
Should I use Grand Exchange or alch values?
Usually the Grand Exchange mid price, which is what the calculator's defaults assume. If you plan to sell instantly, use the low alch or instant-sell price instead, since that is what you will actually receive.
How do supply costs factor in?
Multiply per-kill value by kills per hour, then subtract supplies per hour. Supplies include runes, food, potions, charges, and cannonballs, everything the grind consumes.
Will I actually make this much every hour?
No. Expected value is an average over many hours. Short sessions swing wildly around it, especially when one rare drop dominates the table. Treat the number as a long-run rate, not a promise.
My monster has more than 4 drops. What do I do?
Combine the four most valuable entries by expected value (value divided by rate). Drops worth less than your supply cost per kill barely move the total and can be skipped.