Monster Rancher 1 Combining Calculator & Guide

Check out the Tutorial! This Monster Rancher 1 combination calculator will help you get the strongest baby possible in addition to helping you find the correct date to combine on for the result you want. Alternatively you can use this app just to see what your already-raised monsters will produce.

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Monster 1

Monster 2

Main

Compatibility:

Bad

Sub

Total

Boost

Lif

Pow

Def

Ski

Spd

Int

Target Main

Target Sub

Stat

Base Stats

Starting Stats

Lif

Pow

Def

Ski

Spd

Int

Combination is not possible for the selected target monster

Combining weeks

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Remaining lifespan
of Monster 1 on
Green weeks

Any

Remaining lifespan
of Monster 1 on
Green weeks

40-79

100-139

160-199

220-259

280-339

360-379

Remaining lifespan
of Monster 1 on
Green weeks

1-39

80-99

140-159

200-219

260-279

340-359

380-400

Remaining lifespan
of Monster 1 on
Yellow weeks

Any

Remaining lifespan
of Monster 1 on
Yellow weeks

40-79

100-139

160-199

220-259

280-339

360-379

Remaining lifespan
of Monster 1 on
Yellow weeks

1-39

80-99

140-159

200-219

260-279

340-359

380-400

Remaining lifespan
of Monster 2 on
Red weeks

Any

Remaining lifespan
of Monster 2 on
Red weeks

1-19

40-139

180-219

240-359

380-400

Remaining lifespan
of Monster 2 on
Red weeks

20-39

140-179

220-239

360-379

Remaining lifespan
of Monster 2 on
Blue weeks

Any

Remaining lifespan
of Monster 2 on
Blue weeks

1-19

40-139

180-219

240-359

380-400

Remaining lifespan
of Monster 2 on
Blue weeks

20-39

140-179

220-239

360-379

Explanations & Demonstrations

If you want to do Combining calculations by hand, or understand how the above calculator gets the results

Tutorial: How to use Combining Calculator

Monster Rancher 1 Combination Calculator explanation

Explanation of Combining Basics

The Type of combination (Good/OK/Bad) is set by the parent main breeds. This can't be adjusted.
- "Good" has a much higher chance that some inheritance will occur but the % of stats passed down may not be high.
- "Bad" has the lowest chance inheritance will occur but has the highest % of stats passed down.
- "OK is in the middle.. decent chance stat inheritance will occur, and a decent % of stat passed down.
Stats Boosts are calculated individually per each stat. (Parent 1 stat + Parent 2 stat)/16 = some number with a Remainder. This remainder determines the row in the Compatibility chart which contains the Boost % the baby will get.
The boost determined by (Parent 1 stat + Parent 2 stat)* Boost %
The final boost % is added to the baby monster's baseline stats for the final starting monster stats
Breed outcome is determined by a static chance of paired outcomes on a given time of year, a check for exceptions, then a final determination based on remaining weeks of life.

Hidden Potential

Potential is one of several hidden value that determines how high your stat gains can become. Most monsters are born with 100 potential, meaning their stat gains are at face value. Going over 100 potential can make the same stat gain begin to receive higher stats from Work and Training than previous generations.

Fusion between 2 parents averages their current potential (rounded down to nearest whole number).
Additionally, "Good" fusions get +10, "OK" fusions get +5, "Bad" fusions get +3 potential added to the averaged parent's potential.
Fusion caps at 150.
There is a bug in the Playstation version if you reach 128 seriousness or higher causing peak/prime training and work to fail, regardless of Seriousness value.
The bug is fixed in DX and you can safely reach 150 Potential.

Explanation of Tech Inheritance

Basic Inheritance:

If the Main breed of the Baby matches one of the Parent main breeds, it can inherit techs from the parent it matches.
If the Main breed of the Baby matches BOTH of the parent main breeds, then it defaults to inherit techs only from the first parent.
If the combination is "Good" there is a 70% chance (rolled for each tech), to inherit the tech.
If the combination is "OK" there is a 50% chance (rolled for each tech), to inherit the tech.
If the combination is "Bad" there is a 30% chance (rolled for each tech), to inherit the tech.

Notations:

It is possible to avoid low level techs if it fails the roll/check when it attempts to inherit the tech.
Tech inheritance can be re-rolled until you are happy with the results.

Exceptions:
There are very rare exceptions involving Dino breed, but understanding the translation from the JP Wiki has been difficult. If it is appropriately translated it will be added here.

Explanation of Stat Inheritance

Determine from the chart below if the compatibility is Good, OK or Bad by matching up the 2 monsters you plan to combine.
For each Stat (LIF, POW etc.), Add both parent's Stats and then divide by 16, and Note the Remainder (as in long division remainder) for each Stat.
- Add both Parents LIF together, then divide by 16 and note the remainder.
- Add both Parents POW together, then divide by 16 and note the remainder.
- And so on, until you've done this for each stat.
For each stat, use the Combination chart to match the Remainder (0 to 15) and the Compatibility Column (Good/OK/Bad) to determine how much of each combined parent's Stat value will carry over to the baby.

Compatibility Chart

Breed Type	Type	A	B	C	D	E	F
Dino, Magic, Doodle	A	×	O	O	O	O	O
Worm, Plant, Ape	B	O	×	O	△	△	△
Golem, Hare, Naga, Dragon	C	O	O	×	△	△	△
Jell, Monol, Disk	D	O	△	△	×	△	×
Tiger, Henger, Nya, Ghost	E	O	△	△	△	×	×
Pixie, Suezo, Gali	F	O	O	△	×	×	×

Choose Horizontally first, then vertically

Compatibility Explanation

△ is Good
O is OK
× is Bad

Examples:
Types B with Types E are Good
Types F with Types A are OK
Types A with Types A are Bad

Combination Bonuses

Each parent's individual stat are
added together, then ÷ by 16.
The remainder determines the
bonus % of stats passed to the baby.

Remainder Compatibility

Good OK Bad

0 0% 0% 0%

1 1% 0% 0%

2 2% 0% 0%

3 3% 0% 0%

4 4% 0% 0%

5 4% 0% 0%

6 5% 2% 0%

7 5% 2% 0%

8 5% 4% 0%

9 5% 4% 0%

10 6% 6% 0%

11 6% 6% 0%

12 7% 10% 0%

13 8% 10% 0%

14 9% 10% 10%

15 10% 10% 30%

Remainder	Compatibility
0	0%	0%	0%
1	1%	0%	0%
2	2%	0%	0%
3	3%	0%	0%
4	4%	0%	0%
5	4%	0%	0%
6	5%	2%	0%
7	5%	2%	0%
8	5%	4%	0%
9	5%	4%	0%
10	6%	6%	0%
11	6%	6%	0%
12	7%	10%	0%
13	8%	10%	0%
14	9%	10%	10%
15	10%	10%	30%

Example Calculating a stat

Let's say you have a Jell (Type D) with 483 LIF, and a Gali (Type F) with 300 LIF
Line these up on the Compatibility Chart and this looks to be a "Bad" combination.
Next add the LIF stat together of both monsters, which is 783
Next Divide 783 by 16 with long division, and you'll have a remainder of 15.
Using the Combination chart, Match "Bad" with Remainder 15 and you'll land on 30%

- 30% of the combined 783 LIF of the parents is 234.
- The Baby's LIF will start with an additional 234 LIF onto the base stat.

Explanation of Baby Monster Breed outcome

This section explains why you get a certain result from combination. It is the result of several factors like the Week, the month, remaining lifespan, unlockable breeds, and combination items.
We'll use the following steps to make the determination:

A: Narrow down all combination possibilities to 2 possibilities, by Month and Week.
B: Factor in exceptions.
C: Determine final result based on remaining Lifespan.

Step A: Use the table to line up the Month to the Week to the current Month/Week you are combining on. That intersection indicates 2 possible combination results.

Monster 1 is AB: (Main: A, Sub: B)
Monster 2 is CD: (Main: C, Sub: D)
The intersect narrows it down to two possibilities from Main/Subs of the parents.

Week	1	2	3	4
Month	1	2	3	4
Jan	CA/CB	AC/AD	AC/AD	AC/AD
Feb	CA/CB	AC/AD	DA/DB	BC/BD
Mar	CA/CB	AC/AD	CA/CB	CA/CB
Apr	AC/AD	AC/AD	AC/AD	DA/DB
May	AC/AD	CA/CB	AC/AD	CA/CB
Jun	DA/DB	BC/BD	AC/AD	BC/BD
Jul	CA/CB	CA/CB	AC/AD	BC/BD
Aug	CA/CB	AC/AD	CA/CB	BC/BD
Sep	DA/DB	AC/AD	BC/BD	BC/BD
Oct	AC/AD	AC/AD	CA/CB	CA/CB
Nov	AC/AD	BC/BD	AC/AD	DA/DB
Dec	CA/CB	AC/AD	AC/AD	DA/DB

If Monster 1 is Pixie(A)/Hare(B) and Monster 2 is Worm(C)/Tiger(D), and it's July week 4, the result will be either: Hare/Worm(BC) or Hare/Tiger(BD).

Step B: Exceptions and Unlocks.

Special combination using items or events monsters will override typical combining results (Ape, Doodle, Dragon, Ghost, Henger, Magic, Nya) etc.
If the results from Step A is a special breed (the ones that have to be unlocked), the remaining lifespan will be used only if this main breed has both subs in Step A.
If one of the subs is invalid, the combination result is the remaining option.
If the main has neither sub (including pure breeds):
- AC/AD is AB
- CA/CB is CD
- BC/BD is BB
- DA/DB is DD

Example 1:
- Tiger(A)/Gali(B) combined with Dragon(C)/???(D) (Moo) on Jan 1
- The result is CA/CB (Dragon/Tiger or Dragon/Gali)
- Dragon/Tiger is invalid, but Dragon/Gali is valid, so the result is Dragon/Gali by default

Example 2:
- Dragon(A)/Monol(B) combined with Disk(C)/Disk(D) on Jan 1
- The result is CA/CB (Disk/Dragon or Disk/Monol)
- There's no Disk/Dragon or Disk/Monol. The result can't be CA or CB, so this triggers the last condition in the 4th bullet: "CA/CB is CD", so the result is Disk(C)/Disk(D).

In Step B, if the exception applies for your combination, then you would not need to refer to Step C since your monster will already be determined.

Step C: Final Results

The remaining life of "CD (Monster 2)" affects the "AC/AD" or "BC/BD" patterns.
The remaining life of "AB (Monster 1)" affects the "CA/CB" or "DA/DB" patterns.

Remaining Lifespan		Monster 2 (CD)				Monster 1 (AB)
Remaining Lifespan		AC/AD		BC/BD		CA/CB		DA/DB
Range 1	Range 2	CD		CD		AB		AB
1-19	200-219	AC	AC	BC	BC	CB	CB	DB	DB
20-39	220-239	AD	AD	BD	BD	CB	CA	DB	DA
40-59	240-259	AC	AC	BC	BC	CA	CA	DA	DA
60-79	260-279	AC	AC	BC	BC	CA	CB	DA	DB
80-99	280-299	AC	AC	BC	BC	CB	CA	DB	DA
100-119	300-319	AC	AC	BC	BC	CA	CA	DA	DA
120-139	320-339	AC	AC	BC	BC	CA	CA	DA	DA
140-159	340-359	AD	AC	BD	BC	CB	CB	DB	DB
160-179	360-379	AD	AD	BD	BD	CA	CA	DA	DA
180-199	380-400	AC	AC	BC	BC	CA	CB	DA	DB

Continuing the example from Step A; Our results are either Hare/Worm(BC) or Hare/Tiger(BD), which means using the Second column and "CD" (Parent Monster 2)'s remaining lifespan.
- If the remaining lifespan of Monster 2 was 140-159 weeks, the Baby monster will be Hare/Tiger(BD)
- If the remaining lifespan of Monster 2 was 340-359 weeks, the Baby monster will be Hare/Worm(BC)

Credits to JP Wiki, Teawch, MonsterFenrick

This page was last modified: January 13 2024

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Remainder	Compatibility
Remainder	Good	OK	Bad
0	0%	0%	0%
1	1%	0%	0%
2	2%	0%	0%
3	3%	0%	0%
4	4%	0%	0%
5	4%	0%	0%
6	5%	2%	0%
7	5%	2%	0%
8	5%	4%	0%
9	5%	4%	0%
10	6%	6%	0%
11	6%	6%	0%
12	7%	10%	0%
13	8%	10%	0%
14	9%	10%	10%
15	10%	10%	30%