MoneyRules

MLB earned runs props: how many will the starter allow?

An earned runs prop asks whether a starting pitcher allows more or fewer earned runs than a line, such as 2.5. Runs that score because of a fielding error do not count as earned.

Reviewed Oct 15, 2026

Answer first

90s

01Over or under on earned runs.
02Errors can make runs unearned.
03Runners he leaves on base still count to him.

Key numbers

Earned runs props at a glance

2.5Common lineAverage starter

1.5Common lineAce

4.20League ERARough average

-125Typical priceUnder side

In short

Key takeaways

Unearned runs do not count.
Runners he leaves on base are charged to him.
Short outings cap the total.
The listed pitcher must start.

Progress

How earned runs are charged

1
Runner reaches
Hit, walk or error
2
Scorer rules
Earned or unearned
3
Pitcher pulled
Runners stay his
4
Run scores
Charged to him
5
Game ends
Bet graded

The official scorer decides what is earned.

Example earned runs lines

Pitcher type	Line	Over	Under
Ace	1.5	+105	-135
Good starter	2.5	+110	-140
Average starter	2.5	-120	-110
Back-end starter	3.5	-105	-125
Rookie call-up	2.5	-140	+110

Made-up prices for illustration.

Earned vs unearned

A run is unearned when it would not have scored without an error or a passed ball. The official scorer rebuilds the inning as if the error never happened.

If an error extends an inning with two outs, every run after that point is usually unearned, even if the pitcher then allows two home runs.

This is why earned runs props can differ from runs allowed props. Some books offer both, so check which one you are betting.

ERA and expected earned runs

Season ERA	5 innings	6 innings
2.70	1.5	1.8
3.60	2.0	2.4
4.50	2.5	3.0
5.40	3.0	3.6

ERA times innings divided by 9; our own sums.

Inherited runners

If a starter leaves with runners on base, those runners belong to him. If the reliever lets them score, the earned runs go on the starter’s line.

That means the bet is not finished when the starter leaves. A bases-loaded exit can turn a winning under into a loss two batters later.

Bullpen quality matters for this reason. A strong bullpen strands more inherited runners and protects the under.

Sequence

Checking an earned runs prop

Step 01
Check recent starts
Runs and depth.
Step 02
Look at the lineup
Power and patience.
Step 03
Check the park
Hitter or pitcher park.
Step 04
Read the weather
Wind and heat.
Step 05
Know the bullpen
Who inherits runners.

Rules and settlement

Most books need the listed pitcher to start for action. If he is scratched, the bet is usually void.

Many books also need him to record at least one out. Rules differ, so check whether a first-inning injury voids the bet.

Official scoring changes can come a day later. Books usually settle on the stats at the end of the game.

Floor rules

Earned run terms

Know before you sit

Earned run: Run without help from errors.
Unearned run: Run caused by an error.
Inherited runner: On base when he left.
ERA: Earned runs per 9 innings.

A worked example

A starter has an earned runs line of 2.5 at -130 under. He has a 3.40 ERA and usually goes about 6 innings.

He allows one run through five innings, then leaves in the sixth with two men on base and one out. The reliever gives up a double, and both runners score.

Both runs are charged to the starter, so he finishes with 3 earned runs and the under loses. Had the reliever got a double play, the under would have won with 1.

Common mistakes

Mixing up prop types: Earned vs total runs.
Forgetting inherited runners: They stay on his line.
Ignoring the park: Some parks add runs.
Skipping weather: Wind out adds homers.

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After the 90 seconds

Questions before and after you play

A 90-second guide cannot cover every table moment. Tap a group, then a question — answers are short paragraphs, not one-liners.

01Basics

What is an earned runs prop?

A bet on whether the starting pitcher allows more or fewer earned runs than the line set by the sportsbook.

What makes a run unearned?

A run that would not have scored without an error or passed ball, as judged by the official scorer.

Do home runs count?

Yes. A home run is an earned run unless an earlier error should have ended the inning.

02Rules

What if the pitcher is scratched?

The bet is usually void and the stake returned if the listed pitcher does not start.

Do runs after he leaves count?

Yes, if the runners were on base when he left. Those runs are charged to him. Rules differ between licensed sportsbooks, so read the house rules.

What if scoring changes later?

Most books settle on the official stats at the end of the game. Rules differ between licensed sportsbooks, so read the house rules.

03Strategy

Is the under usually favored?

Often yes, because many starters leave before allowing three runs. Rules differ between licensed sportsbooks, so read the house rules.

What helps the under?

A pitcher-friendly park, a weak lineup and a strong bullpen behind him. Rules differ between licensed sportsbooks, so read the house rules.

Where can I get help?

If betting stops being fun, call or text 1-800-GAMBLER for free, private help any time of day.

Sources

MLB — Official rules Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Scoring rules and stat definitions
Baseball Reference — MLB stats Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026League and player statistics
Wizard of Odds — Sports betting Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Sports betting math
National Council on Problem Gambling — Help and resources Not from a registry (Reference source, not an official registry) · accessed Oct 15, 2026Free, confidential help: call or text 1-800-GAMBLER