Gaming and tabletop calculators
Two kinds of maths live here. Some of it is permanent — the Minecraft nether ratio and the CS2 float formula have not changed and are unlikely to. The rest is balance data that a patch can rewrite overnight, and those pages say so and carry the date they were last checked.
Nether portal
Convert coordinates between the Overworld and the Nether at the 8:1 ratio.
D&D HP calculator
Hit points by class, level and Constitution — average, rolled range and feats.
5e point buy
Spend your 27 points across six abilities, with racial bonuses and modifiers live.
CS2 trade-up float
Work out the exact output float from ten inputs — float maths only, no prices.
Rust raid cost
Sulfur cost by wall tier, with every explosive compared so you can pick the cheapest.
Which of these can go stale
The nether portal ratio, the D&D hit dice table and the trade-up float formula are rules rather than settings. They are as true today as they were five years ago.
Rust explosive costs are not. Facepunch rebalances them, and a raid calculator that has not been touched in a year can send you out with half the sulfur you need. That page carries a verification date for exactly that reason, and it is the one worth checking against the game before you rely on it.
Looking for something else?
There are 88 calculators on the site across 11 subjects — tax, benefits, grades, trades, sport and everyday maths.
Browse every calculator