What XP curve does this use?

It uses the official Old School RuneScape experience table, where the XP to reach a level grows by roughly 10 percent per level. Level 99 requires about 13 million experience, which is why the final levels take so long even at high XP rates.

How is the number of days calculated?

The tool divides the experience remaining by your method's XP per hour to get total play hours, then divides by your hours per day to get calendar days. Both figures are shown so you can plan around your real schedule.

Why do higher levels take so much longer?

The XP curve is exponential. Each level needs about 10 percent more total experience than the one before, so the jump from 90 to 99 is a far larger share of the grind than the jump from 1 to 50, even though both are nine levels.

Are the XP rates exact?

They are realistic mid-to-high efficiency rates for each method, not your guaranteed personal rate. Your actual XP per hour depends on focus, gear, location, and breaks, so treat the forecast as a planning estimate.

Can I use this for any skill?

Yes. The XP curve to level 99 is identical for every skill in Old School RuneScape, so you only need to pick a method whose XP rate matches the skill you are training to get an accurate forecast.

Old School RuneScape Time-to-Max-Level Calculator

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Reaching level 99 in Old School RuneScape is a long grind, and the exponential XP curve means the last few levels dwarf the early ones. This calculator forecasts the total hours and calendar days to max a skill at your chosen pace.

How it works

It reads the genuine Old School RuneScape XP table — where each level needs about 10 percent more experience than the last — to find the experience between your current level and level 99, then divides by your method’s rate:

xp remaining = totalXp(99) − totalXp(current level)
total hours  = xp remaining / xp per hour
days         = total hours / hours per day

Level 99 sits at roughly 13 million total experience, which is why even fast methods can take dozens of hours.

Example and tips

Going from level 80 to 99 leaves the majority of the 13-million-XP grind ahead of you, because most of the curve’s experience lives in the top levels. At a high method rate of around a million XP per hour you might finish in a couple of dozen hours, while a slower 250k-per-hour method stretches it into the hundreds. Pick the highest sustainable XP rate you can focus on, and remember that consistent daily hours finish a skill far sooner than occasional long sessions.