Yes, that is fine for your own use - but I like to share. It become troublesome to explain why my statblocks are different from standard and that it was on purpose!
Why would you have to explain it?
PS - care to share your work. I had a thread on these forums about doing that based on creating and "average" PC - but I never finished
It's fluctuating, but here's the gist.
Standard monsters.
AC follows the DMG chart, except level 9 is fixed to 17. They either got their math wrong or intentionally changed it to verify if someone copied their chart.
HP is 8 at 1st level and +4 per level thereafter.
Modifier is +5 at 1st level and +1 every odd level, so +6 at 3rd, +7 at 5th, etc. Use this for all their checks...attacks, skills, abilities, etc.
Standard monsters get 1 attack each.
Average damage is 3 at 1st level and +2 every level thereafter. I roll 1d5 at 1st level, 1d5+1 at 2nd, then 2d6+X from 3rd. This gives your damage more consistency over time and so is less spiky except for crits. High modifier, low variability.
Save DCs are the attack bonus +7, so 12 at 1st and 2nd, 13 at 3rd and 4th, etc.
Clocks are 2. Clocks are like clocks and countdowns from BitD. Two successful checks to overcome that obstacle whether it's bribery, persuasion, intimidation, etc. This opens up encounters to more than just combat.
A medium encounter is 1 standard monster per PC. An easy encounter is 1 standard monster per 2 PCs. A hard encounter is 3 standard monsters per 2 PCs. A deadly encounter is 2 monsters per 1 PC.
You can also combine these to make a solo. Add together the HP, number of attacks, and clocks.
Use this like you would 4E monster math for encounter design. Only have 2 players show up or have a full table of 9 players tonight, do some quick math and you have an appropriate encounter. No more worrying about it.
Most of that comes from Blog of Holding's 5E MM on a business card. I started there and tweaked it to allow more flexibility, i.e. 4E monster design.