OSRS calculators
Answers to the questions that come up while you play, worked from the game's own formulas. Nothing to sign in to, nothing to wait for.
Calculators
Worked from the game's own formulas
Experience curves, combat level, drop probability and the Grand Exchange tax are fixed by the game. These work them out exactly, in the browser, with nothing to load.
Max Hit Calculator
Your exact max hit for melee, ranged and magic, using the game's own formula.
Accounts for prayer, attack style, void, potions and the damage multipliers, and floors at every step the way the game does — which is why the answer matches in game rather than being one off.
GE Profit Calculator
Work out net profit on a flip after the 2% Grand Exchange tax.
Enter a buy price, sell price and quantity to see gross profit, tax charged, net profit, ROI and the capital the trade ties up.
GE Tax Calculator
See exactly what the Grand Exchange takes from a sale.
Shows the tax on a single sale, including the per-item cap and the exemptions, plus the break-even price you need to sell at to avoid a loss.
XP Calculator
Experience remaining to your target level, and how many actions that takes.
Works from either level or exact experience, and converts the remainder into actions at whatever rate you enter.
Combat Level Calculator
Calculate combat level and see which stat raises it next.
Uses the standard Old School combat formula and tells you the cheapest single stat increase that would push you into the next combat level.
Drop Rate Calculator
The real odds of seeing a drop across a number of kills.
Calculates the probability of at least one drop over N attempts, the odds of going dry, and the kill counts at which you pass 50%, 90% and 99%.
Prayer Calculator
Bones needed and GP cost to reach your Prayer goal, at live prices.
Compares every bone against every altar multiplier, so you can see how many you actually need before committing to a route.
Herblore Calculator
Every potion ranked by cost per experience point.
Prices each potion and herb against the live market, including what the finished product sells back for.
Crafting Calculator
Battlestaves, dragonhide, glass and jewellery, costed per XP.
Smithing Calculator
Bar and item smithing costs at current ore and coal prices.
Cooking Calculator
Raw against cooked prices for every food worth training on.
Fletching Calculator
Bows, bolts and darts ranked by cost per experience point.
Construction Calculator
What each plank method costs, at today's plank prices.
In development
What we are building next
Listed honestly as unfinished rather than shown as working features.
DPS Calculator
Compare weapon and gear setups against a specific monster.
How these calculators work
Every calculator here shows its working. Where a result depends on a game formula — the experience curve, the combat level equation, drop probability — the formula is written out on the page, so you can check the result rather than trust it.
Where a result depends on prices, those prices come from recent Grand Exchange trades and carry a timestamp. A high alchemy ranking calculated an hour ago is not the same as one calculated now, and we would rather tell you when the numbers were gathered than describe them vaguely as live.
Nothing here requires an account, and nothing is held back behind a signup. If a calculator gives you the answer you needed, that is the page having done its job.