diff --git a/zenno/src/lib/all.ts b/zenno/src/lib/all.ts
index 772088a..0e2c415 100644
--- a/zenno/src/lib/all.ts
+++ b/zenno/src/lib/all.ts
@@ -44,6 +44,11 @@ export const PAGES = {
 			name: 'Gate Calculator',
 			description: 'Calculate the importance of acceleration effects at the starting gate.',
 		},
+		{
+			route: resolve('/race/carryover'),
+			name: 'Carryover Calculator',
+			description: 'Calculate the importance of acceleration and speed carryover at the start of late race.',
+		},
 	] satisfies Page[],
 	career: [
 		{
diff --git a/zenno/src/routes/race/carryover/+page.svelte b/zenno/src/routes/race/carryover/+page.svelte
new file mode 100644
index 0000000..8748ddc
--- /dev/null
+++ b/zenno/src/routes/race/carryover/+page.svelte
@@ -0,0 +1,343 @@
+<script lang="ts">
+	import * as Plot from '@observablehq/plot';
+	import * as race from '$lib/race';
+	import * as accel from '$lib/racelib/accel';
+	import type { Attachment } from 'svelte/attachments';
+	import CalcInfo from '../CalcInfo.svelte';
+
+	let rawSpeed = $state(1200);
+	let rawPower = $state(1200);
+	let rawGuts = $state(1200);
+	let rawWit = $state(1200);
+	let speedBonus = $state(0);
+	let powerBonus = $state(0);
+	let gutsBonus = $state(0);
+	let witBonus = $state(0);
+	let style = $state(race.RunningStyle.FrontRunner);
+	let surfApt = $state(race.AptitudeLevel.A);
+	let distApt = $state(race.AptitudeLevel.A);
+	let styleApt = $state(race.AptitudeLevel.A);
+	let mood = $state(race.Mood.Normal);
+	let isCareer = $state(false);
+
+	let raceLen = $state(2000);
+	let surface = $state(race.Surface.Turf);
+	let conditions = $state(race.GroundConditions.Firm);
+	let slope = $state(0); // TODO(zeph): where does it end?
+	let allowDAM = $state(false);
+	let threshMod = $state(1);
+
+	const phases = $derived(race.phases(raceLen));
+	const distanceType = $derived(race.distance(raceLen));
+
+	let skillCarry = $state(0);
+	let rawAccels: accel.Skill[] = $state([]);
+	let accelToAdd = $state({ x: 0, accel: 0.2, dur: 3 });
+	const quick = [
+		{
+			name: 'Angling/Beyond',
+			skills: [{ x: 0, accel: 0.4, dur: 5 }],
+		},
+		{
+			name: 'Angling/Beyond Inherit',
+			skills: [{ x: 0, accel: 0.2, dur: 3 }],
+		},
+		{
+			name: 'Clear',
+			skills: [],
+		},
+	];
+	function addAccel() {
+		rawAccels.push(accelToAdd);
+		accelToAdd = { x: 0, accel: 0.2, dur: 3 };
+	}
+	function removeAccel(i: number) {
+		rawAccels.splice(i, 1);
+	}
+	function setAccelList(l: accel.Skill[]) {
+		rawAccels = l;
+	}
+
+	const baseSpeed = $derived(race.baseStat(mood, rawSpeed));
+	const basePower = $derived(race.baseStat(mood, rawPower));
+	const baseGuts = $derived(race.baseStat(mood, rawGuts));
+	const baseWit = $derived(race.baseStat(mood, rawWit));
+	const adjSpeed = $derived(race.adjustedStat(race.Stat.Speed, baseSpeed, isCareer, surface, conditions, threshMod));
+	const adjPower = $derived(race.adjustedStat(race.Stat.Power, basePower, isCareer, surface, conditions));
+	const adjGuts = $derived(race.adjustedStat(race.Stat.Guts, baseGuts, isCareer));
+	const adjWit = $derived(race.adjustedStat(race.Stat.Wit, baseWit, isCareer, styleApt));
+	const speed = $derived(race.finalStat(adjSpeed, speedBonus));
+	const power = $derived(race.finalStat(adjPower, powerBonus));
+	const guts = $derived(race.finalStat(adjGuts, gutsBonus));
+	const wit = $derived(race.finalStat(adjWit, witBonus));
+
+	const damCarry = $derived(allowDAM && slope < 0 ? race.downhillAccelMod(slope) : 0);
+	const carry = $derived(skillCarry + damCarry);
+	const midSpeed = $derived.by(() => {
+		const s = race.sectionSpeed(raceLen, baseWit, wit, style, race.Phase.MidRace) satisfies [number, number];
+		const u = slope > 0 ? race.uphillMod(power, slope) : 0;
+		return [s[0] + u, s[1] + u] as const;
+	});
+	const spurtSpeed = $derived(race.spurtSpeed(speed, guts, style, distApt, raceLen));
+	const lateAccel = $derived(race.acceleration(power, style, surfApt, race.Phase.LateRace, distApt, slope > 0));
+
+	function doSeggs(startSpeed: number, accels: accel.Skill[]) {
+		const start: accel.Instant = { x: phases[race.Phase.MidRace], v: startSpeed, t: 0 };
+		return accel.up(start, spurtSpeed, lateAccel, accels).segments;
+	}
+	function last<T>(l: T[]): T {
+		return l[l.length - 1];
+	}
+	const accels = $derived(
+		rawAccels.map((s) => ({ ...s, x: (s.x ?? 0) + phases[race.Phase.MidRace], dur: race.skillDuration(s.dur, raceLen) })),
+	);
+	const seggs = $derived([doSeggs(midSpeed[0] + carry, accels), doSeggs(midSpeed[1] + carry, accels)] as const);
+	const uncarried = $derived([doSeggs(midSpeed[0], accels), doSeggs(midSpeed[1], accels)] as const);
+	const unskilled = $derived([doSeggs(midSpeed[0], []), doSeggs(midSpeed[1], [])] as const);
+
+	const distance = $derived([last(seggs[0]).end.x, last(seggs[1]).end.x] as const);
+	const time = $derived([last(seggs[0]).end.t, last(seggs[1]).end.t] as const);
+	const finishTime = $derived([
+		time[0] + (phases[race.Phase.LateRace] - distance[0]) / spurtSpeed,
+		time[1] + (phases[race.Phase.LateRace] - distance[1]) / spurtSpeed,
+	] as const);
+	function gainLengths(fast: accel.Instant, slow: accel.Instant): number {
+		const m = fast.v * (slow.t - fast.t) + fast.x - slow.x;
+		return m / race.HORSE_LENGTH;
+	}
+	const skillGain = $derived([
+		gainLengths(last(seggs[0]).end, last(unskilled[0]).end),
+		gainLengths(last(seggs[1]).end, last(unskilled[1]).end),
+	]);
+	const carryoverGain = $derived([
+		gainLengths(last(seggs[0]).end, last(uncarried[0]).end),
+		gainLengths(last(seggs[1]).end, last(uncarried[1]).end),
+	]);
+
+	let width = $state(1);
+	let height = $state(1);
+	const plotLines = $derived([
+		{ t: 0, x: phases[race.Phase.MidRace], v: midSpeed[1] + carry, label: 'Fastest Speed' },
+		...seggs[1].map((t) => ({ t: t.end.t, x: t.end.x, v: t.end.v, label: 'Fastest Speed' })),
+		{ t: finishTime[1], x: phases[race.Phase.LateRace], v: spurtSpeed, label: 'Fastest Speed' },
+		{ t: 0, x: phases[race.Phase.MidRace], v: midSpeed[1], label: 'No Carryover' },
+		...uncarried[1].map((t) => ({ t: t.end.t, x: t.end.x, v: t.end.v, label: 'No Carryover' })),
+		{ t: finishTime[1], x: phases[race.Phase.LateRace], v: spurtSpeed, label: 'No Carryover' },
+		{ t: 0, x: phases[race.Phase.MidRace], v: midSpeed[1], label: 'No Skills' },
+		...unskilled[1].map((t) => ({ t: t.end.t, x: t.end.x, v: t.end.v, label: 'No Skills' })),
+		{ t: finishTime[1], x: phases[race.Phase.LateRace], v: spurtSpeed, label: 'No Skills' },
+	]);
+	const makeChart: Attachment = (el) => {
+		$effect(() => {
+			el?.firstChild?.remove();
+			el?.append(
+				Plot.plot({
+					width,
+					height,
+					clip: true,
+					x: {
+						domain: [0, finishTime[1]],
+						label: 'Time (s)',
+						line: true,
+					},
+					y: {
+						domain: [17, 27],
+						label: 'Speed (m/s)',
+						line: true,
+					},
+					color: { legend: true },
+					marks: [Plot.frame(), Plot.line(plotLines, { x: 't', y: 'v', stroke: 'label', strokeWidth: 3 })],
+				}),
+			);
+		});
+	};
+</script>
+
+<h1 class="text-4xl">Carryover Calculator</h1>
+<form class="mx-auto my-4 grid max-w-4xl grid-cols-1 gap-4 rounded-md p-4 shadow-sm md:grid-cols-12">
+	<div class="col-span-full grid rounded-md text-center shadow-md ring md:grid-cols-5">
+		<div class="m-4">
+			<label for="speedStat">Speed</label>
+			<input type="number" id="speedStat" bind:value={rawSpeed} class="w-full" />
+		</div>
+		<div class="m-4">
+			<label for="powerStat">Power</label>
+			<input type="number" id="powerStat" bind:value={rawPower} class="w-full" />
+		</div>
+		<div class="m-4">
+			<label for="gutsStat">Guts</label>
+			<input type="number" id="gutsStat" bind:value={rawGuts} class="w-full" />
+		</div>
+		<div class="m-4">
+			<label for="witStat">Wit</label>
+			<input type="number" id="witStat" bind:value={rawWit} class="w-full" />
+		</div>
+		<div class="col-start-1 m-4">
+			<label for="speedBonus">Speed Greens</label>
+			<input type="number" id="speedBonus" bind:value={speedBonus} class="w-full" />
+		</div>
+		<div class="m-4">
+			<label for="powerBonus">Power Greens</label>
+			<input type="number" id="powerBonus" bind:value={powerBonus} class="w-full" />
+		</div>
+		<div class="m-4">
+			<label for="gutsBonus">Guts Greens</label>
+			<input type="number" id="gutsBonus" bind:value={gutsBonus} class="w-full" />
+		</div>
+		<div class="m-4">
+			<label for="witBonus">Wit Greens</label>
+			<input type="number" id="witBonus" bind:value={witBonus} class="w-full" />
+		</div>
+		<div class="col-start-1 m-4">
+			<label for="style">Style</label>
+			<select id="style" required bind:value={style} class="w-full">
+				{#each race.RUNNING_STYLES as [name, style] (style)}
+					<option value={style}>{name}</option>
+				{/each}
+			</select>
+		</div>
+		<div class="m-4">
+			<label for="distanceApt">{race.Distance[distanceType]}</label>
+			<select id="distanceApt" required bind:value={distApt} class="w-full">
+				{#each race.APTITUDE_LEVELS as apt (apt)}
+					<option value={apt}>{race.AptitudeLevel[apt]}</option>
+				{/each}
+			</select>
+		</div>
+		<div class="m-4">
+			<label for="surfaceApt">{race.Surface[surface]}</label>
+			<select id="surfaceApt" required bind:value={surfApt} class="w-full">
+				{#each race.APTITUDE_LEVELS as apt (apt)}
+					<option value={apt}>{race.AptitudeLevel[apt]}</option>
+				{/each}
+			</select>
+		</div>
+		<div class="m-4">
+			<label for="styleApt">Style</label>
+			<select id="styleApt" required bind:value={styleApt} class="w-full">
+				{#each race.APTITUDE_LEVELS as apt (apt)}
+					<option value={apt}>{race.AptitudeLevel[apt]}</option>
+				{/each}
+			</select>
+		</div>
+		<div class="m-4">
+			<label for="mood">Mood</label>
+			<select id="mood" required bind:value={mood} class="w-full">
+				{#each race.MOODS as mood (mood)}
+					<option value={mood}>{race.Mood[mood]}</option>
+				{/each}
+			</select>
+		</div>
+	</div>
+
+	<div class="mb-auto grid max-w-4xl grid-cols-6 rounded-md text-center shadow-md ring md:col-span-6">
+		<input
+			class="col-span-4 m-4 w-full justify-self-center-safe"
+			type="range"
+			id="raceLen"
+			min="1000"
+			max="3600"
+			step="100"
+			bind:value={raceLen}
+		/>
+		<span class="col-span-2 my-auto mb-4 pl-2 text-sm">{raceLen}m</span>
+		<select id="surface" bind:value={surface} class="col-span-2 mx-2 mb-4">
+			<option value={race.Surface.Turf}>Turf</option>
+			<option value={race.Surface.Dirt}>Dirt</option>
+		</select>
+		<select id="conditions" bind:value={conditions} class="col-span-2 mx-2 mb-4">
+			{#each race.GROUND_CONDITONS as cond (cond)}
+				<option value={cond}>{race.GroundConditions[cond]}</option>
+			{/each}
+		</select>
+		<select id="slope" bind:value={slope} class="col-span-2 mx-2 mb-4">
+			{#each [2, 1.5, 1, 0, -1, -1.5, -2] as per (per)}
+				<option value={per}>{per > 0 ? `Uphill +${per}` : per < 0 ? `Downhill ${per}` : 'Flat'}</option>
+			{/each}
+		</select>
+	</div>
+
+	<div class="mb-auto flex w-full max-w-4xl flex-col rounded-md text-center shadow-md ring md:col-span-6">
+		<div class="mx-4 mt-2 flex flex-row gap-2">
+			<span class="w-24 flex-1">Delay (m)</span>
+			<span class="w-24 flex-1">Duration</span>
+			<span class="w-24 flex-1">Accel</span>
+			<span class="w-8 flex-none"><!-- filler to align other columns --></span>
+		</div>
+		{#each rawAccels as skill, i (i)}
+			<div class="mx-4 mt-2 flex flex-row gap-2">
+				<span class="my-auto w-24 flex-1">{skill.x}m</span>
+				<span class="my-auto w-24 flex-1">{skill.dur}s</span>
+				<span class="my-auto w-24 flex-1">{skill.accel}</span>
+				<button
+					type="button"
+					class="my-auto h-8 w-8 flex-none rounded-full bg-mist-300 text-2xl hover:cursor-pointer dark:bg-mist-900"
+					onclick={() => removeAccel(i)}>&times;</button
+				>
+			</div>
+		{/each}
+		<div class="mx-4 mt-2 flex flex-row gap-2">
+			<input type="number" class="my-auto w-24 flex-1" min="0" max={raceLen} step="1" bind:value={accelToAdd.x} />
+			<input type="number" class="my-auto w-24 flex-1" min="0.9" step="0.3" bind:value={accelToAdd.dur} />
+			<input type="number" class="my-auto w-24 flex-1" min="0" step="0.05" bind:value={accelToAdd.accel} />
+			<button
+				type="button"
+				class="my-auto h-8 w-8 flex-none rounded-full bg-mist-300 text-2xl hover:cursor-pointer dark:bg-mist-900"
+				onclick={addAccel}>+</button
+			>
+		</div>
+		<div class="mt-1 flex flex-row">
+			<span class="my-auto h-0 flex-1 border"></span>
+			<span class="mx-2 flex-none">Quick Setup</span>
+			<span class="my-auto h-0 flex-1 border"></span>
+		</div>
+		<div class="m-2 flex flex-row place-content-center-safe gap-2">
+			{#each quick as q (q.name)}
+				<button
+					type="button"
+					class="rounded-md bg-mist-300 p-2 hover:cursor-pointer dark:bg-mist-900"
+					onclick={() => setAccelList(q.skills)}>{q.name}</button
+				>
+			{/each}
+		</div>
+	</div>
+
+	<div class="flex w-full max-w-4xl rounded-md text-center shadow-md ring md:col-span-8 md:col-start-3">
+		<div class="m-4 flex-1">
+			<label for="carryover">Carryover Speed</label>
+			<input type="number" id="carryover" min="0" step="0.05" bind:value={skillCarry} class="w-full" />
+		</div>
+		<div class="m-4 my-auto flex-1">
+			<input type="checkbox" id="dam" bind:checked={allowDAM} disabled={slope >= 0} class="peer my-auto h-6 w-6 align-middle" />
+			<label for="dam" class="my-auto align-middle peer-disabled:opacity-75">Downhill Mode Carryover</label>
+		</div>
+	</div>
+</form>
+
+{#snippet info(name: string, unit: string, val: number, val2?: number)}
+	<CalcInfo title={name} class="max-w-72 flex-1">
+		{#if val2 == null}
+			<span class="block text-xl">{val.toFixed(3)} {unit}</span>
+		{:else}
+			<span class="block text-xl">{val.toFixed(3)} &ndash; {val2.toFixed(3)} {unit}</span>
+		{/if}
+	</CalcInfo>
+{/snippet}
+
+<div class="mx-auto flex w-full flex-col place-items-center md:flex-row md:justify-center">
+	{@render info('Mid-Race Speed', 'm/s', midSpeed[0], midSpeed[1])}
+	{@render info('Base Acceleration', 'm/s²', lateAccel)}
+	{@render info('Spurt Speed', 'm/s', spurtSpeed)}
+</div>
+<div class="mx-auto flex w-full flex-col place-items-center md:flex-row md:justify-center">
+	{@render info('Accel Distance', 'm', distance[1] - phases[race.Phase.MidRace], distance[0] - phases[race.Phase.MidRace])}
+	{@render info('Accel Time', 's', time[1], time[0])}
+	{@render info('Finish Time', 's', finishTime[1], finishTime[0])}
+</div>
+<div class="mx-auto flex w-full flex-col place-items-center md:flex-row md:justify-center">
+	{@render info('Carryover Gain', 'L', carryoverGain[1], carryoverGain[0])}
+	{@render info('Carryover + Accel Gain', 'L', skillGain[1], skillGain[0])}
+</div>
+<div class="mx-auto mb-12 h-72 max-w-4xl" bind:clientWidth={width} bind:clientHeight={height}>
+	<div role="img" {@attach makeChart}>the chart seems to have didn't</div>
+</div>