Mashed Potato Calculator
Mashed potato pounds, butter, and milk for any guest count.
What it does
Mashed potatoes anchor holiday tables. Raw pounds set the pot, butter sets richness, and milk sets the silk.
The tool above scales all three by appetite. Ten standard guests need 5 lb of raw potatoes with 10 tbsp of butter and 2 cups of milk. The metric match is 2.3 kg with 142 g and 473 ml.
Appetite pounds guide the raw buy. Light thirds suit buffets with many sides, standard halves suit holiday dinners, and hearty three quarters suit potato lovers.
Butter and milk follow guests, not pounds. A tablespoon of butter and a fifth cup of milk each keep ratios steady across party sizes.
Hot technique finishes. Salted boiling water, dry steamed spuds, and warm milk mash smoother than any ratio alone.
How to use
- Pick imperial (lb) or metric (kg, g, ml).
- Enter guests.
- Pick appetite: standard suits holidays.
- Read potatoes first.
- Read butter next, then milk.
- Boil salted, mash hot, serve fast.
Formula
- guests
- Headcount eating potatoes.
- appetite
- Light, standard, or hearty eaters.
Metric runs 0.453592 kg per lb, 14.2 g butter per tbsp, and 236.6 ml milk per cup.
Worked example
Example: 10 guests, standard
Imperial defaults: 10 guests, standard appetite. These are also the default values, so the page opens on this answer.
- Guests: 10, standard appetite.
- Raw: 10 x 0.5 = 5 lb potatoes.
- Butter: 10 x 1 = 10 tbsp.
- Milk: 10 x 0.2 = 2 cups.
- Tool shows 5 lb potatoes, 10 tbsp butter, 2 cups milk.
Reference table
| Guests | Raw | Butter |
|---|---|---|
| 6 | 3 lb | 6 tbsp |
| 10 | 5 lb | 10 tbsp |
| 20 | 10 lb | 20 tbsp |
| 30 | 15 lb | 30 tbsp |
Limits
- Quantity math only. Technique rules texture.
- Potato types mash differently.
- Diets need swaps for dairy.
- Leftovers need fast chilling.
Common mistakes
- Cold milk into hot spuds.
- Overworking into glue.
- No salt in the boil water.
- One pot for forty guests.
- Holding lukewarm for hours.
Try it yourself
Quick checks. Answers sit tucked under each question.
20 guests standard?
Raw is 20 x 0.5 = 10 lb. Butter is 20 tbsp. Milk is 20 x 0.2 = 4 cups.
6 guests hearty?
Raw is 6 x 0.75 = 4.5 lb. Butter is 6 tbsp. Milk is 6 x 0.2 = 1.2 cups.
Questions
Potatoes for 10 guests?
Multiply guests by pounds each. Here 10 x 0.5 = 5 lb raw.
Butter?
One tablespoon per guest. Here 10 tbsp.
Milk?
Two tenths cup per guest. Here 10 x 0.2 = 2 cups.
Per person amounts?
Light third pound, standard half pound, hearty three quarter pound raw each.
Potato type matter?
Yes. Yukon mashes creamier than russets at equal butter.
Lump free guaranteed?
No. Lumps and salt need technique.