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A Damage per Round calculator for use in comparing the relative strengths of different Pathfinder 2e characters.
<!DOCTYPE html>
<html lang="en-US">
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Copyright 2020 serialhex <serialhex@gmail.com>
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<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>DPR-ism</title>
<script>
var rows = 0;
var all_rows = [];
function calc_all_rows() {
all_rows.forEach(fn => {
fn();
});
}
function calculate_damage(min_roll, dmg, atks, matkp, res) {
if (atks == 0) {
return res;
}
console.log("min roll: " + min_roll + " matkp: " + matkp);
if (min_roll > 30) {
// can't hit even on a natural 20
console.log("complete fail");
res.tohit.push("nil");
res.dpr += 0;
} else if (min_roll > 20) {
console.log("only hit on a nat 20");
// only hit on a natural 20
res.tohit.push(20);
res.dpr += dmg * 0.05;
} else if (min_roll <= 20 && min_roll > 10) {
// a single crit
console.log("single crit");
res.tohit.push(Math.max(2, min_roll));
var hits = 20 - Math.max(2, min_roll);
res.dpr += dmg * 0.05 * (hits + 1);
} else if (min_roll <= 10 && min_roll >= -9) {
// multiple crits
console.log("multi crits");
res.tohit.push(Math.max(2, min_roll));
var hits = 20 - Math.max(2, min_roll);
var crits = hits - 10;
console.log("# hits: " + hits + " # crits: " + crits);
res.dpr += dmg * 0.05 * (hits + crits);
} else {
// all crits & 1 hit
console.log("all crits");
var hits = 1;
var crits = 19;
res.tohit.push(1)
res.dpr += dmg * 0.05; // the hit
res.dpr += dmg * 0.05 * 19 * 2; // the crits
}
return calculate_damage(min_roll + matkp, dmg, atks - 1, matkp, res);
}
</script>
</head>
<body>
This is a nifty tool to figure out about how much damage a character can output per round against a target AC. This doesn't (yet) take into account things like resistances or weakness.
<br>
<br>
<br>
Target AC: <input type="number" id="ac" value="18" onchange="calc_all_rows()"/>
<table id="dprism">
<thead>
<tr>
<th>Attack Bonus</th>
<th>Damage</th>
<th>Number of Attacks per Round</th>
<th>Multiple Attack Penalty</th>
<th>To-hit</th>
<th>DPR</th>
</tr>
</thead>
<tbody></tbody>
</table>
<script>
function addrow() {
var tableRef = document.getElementById('dprism').getElementsByTagName('tbody')[0];
// Insert a row in the table at the last row
var newRow = tableRef.insertRow();
rows++;
// Attack Bonus
var atk = document.createElement('input');
atk.type = "number";
atk.id = "atk" + rows;
atk.value = 10;
atk.style = "width:100px";
// Number and size of dice
var ndice = document.createElement('input');
ndice.type = "number";
ndice.id = "ndice" + rows;
ndice.value = 1;
ndice.style = "width:50px";
var sdice = document.createElement('input');
sdice.type = "number";
sdice.id = "sdice" + rows;
sdice.value = 8;
sdice.style = "width:50px";
// Number of attacks
var natk = document.createElement('input');
natk.type = "number";
natk.id = "natk" + rows;
natk.value = 2;
// Multiple attack penalty
var matkp = document.createElement('input');
matkp.type = "number";
matkp.id = "matkp" + rows;
matkp.value = -5;
var tohit = document.createTextNode("");
var dpr = document.createTextNode("");
function calculate() {
var s = sdice.value * 1.0;
var n = ndice.value * 1.0;
var damage = n * (1 + s) * 0.5;
var target = document.getElementById('ac').value;
// natural 1 is always a fail... maybe
var min_roll = target - atk.value;
console.log("------------------------");
var res = calculate_damage(
min_roll, damage, natk.value, -1.0 * matkp.value, {tohit: [], dpr: 0});
tohit.textContent = res.tohit;
dpr.textContent = res.dpr;
}
atk.addEventListener("input", function () {calculate()});
ndice.addEventListener("input", function () {
if (this.value < 1) {
this.value = 1;
alert("Can't have fewer than one die!");
return;
}
calculate()
});
sdice.addEventListener("input", function () {
if (this.value < 1) {
this.value = 1;
alert("Dice can't have fewer than one side!");
return;
}
calculate()
});
natk.addEventListener("input", function () {
if (this.value < 0) {
this.value = 1;
alert("Number of attacks should always be greater than 0!");
return;
}
calculate()
});
matkp.addEventListener("input", function () {
if (this.value < 0) {
this.value = -1;
alert("Multiple Attack Penalty should always be less than 0!");
return;
}
calculate()
});
all_rows.push(calculate);
// Insert a cell in the row
newRow.insertCell().appendChild(atk);
var dam = newRow.insertCell();
dam.appendChild(ndice);
dam.appendChild(document.createTextNode("d"));
dam.appendChild(sdice);
newRow.insertCell().appendChild(natk);
newRow.insertCell().appendChild(matkp);
newRow.insertCell().appendChild(tohit);
newRow.insertCell().appendChild(dpr);
}
// seed with the first row
addrow();
</script>
<input type=button onclick="addrow()" value="Add a row"/>
<br>
<input type=button onclick="calc_all_rows()" value="Recalculate all"/>
</body>
</html>
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