COFFEE BREW CALCULATOR

My journey into “plastic-free” coffee was NOT fun and there was NO manual. Nothing like half asleep sipping on some weak ass coffee gone wrong.

I have documented the tips/hacks and shared my journey so that hopefully others will have it easier. This calculator tells you how much coffee you’ll need and just how many seconds to grind (in a burr grinder) to get that coffee. So the seconds shown should get you the amount of coffee you see calculated.

The calculator assumes you want a strong bold cup of coffee.

Coffee Brew Calculator

Percolator Cheat Sheet

Mark Water (oz) Coffee (tbsp) Grind (sec) Brewed (oz)
42010~13–1514.4
52512.5~20 (max)18.0
6301520 + 521.6
73517.520 + 825.2
7.537.518.7520 + 1027.0
8402020 + 1228.8
94522.520 + 1532.4
10502520 + 1836.0
12603020 + 20 + 543.2
SOURDOUGH STARTER MATH CALCULATOR

Use this calculator to figure out how much and when to feed your starter to make sure you have enough starter for your recipe.

As with all things sourdough, pay attention to your dough first and foremost. These are just guides and may not be accurate for your environment. 

Sourdough Starter Feed Calculator
Fill in times exactly as the sample shows.





Real-world note: You may lose 5–10% of starter weight due to evaporation, CO₂ release, and starter sticking to the jar or tools. If you need an exact amount (e.g., 420g), enter 5–10% more into “Starter needed.”
Leave blank to auto-select best ratio. Ratio table below for reference.
Ratio Hours to Peak
1:1:1 to 1:2:24–6 hr
1:3:36–8 hr
1:4:48–10 hr
1:5:5 to 1:6:610–12 hr
1:7:7 to 1:9:912–14 hr
1:10:10 to 1:12:1214–16 hr
1:13:13 to 1:15:1516–24 hr

Show Sourdough Starter Tips
Starter Ratio: The numbers in “1:X:X” refer to parts starter, flour, and water (by weight, in grams).
Timing: Your starter is usually ready when it's domed on top and has risen significantly. Mark your jar after feeding and check after several hours; if it continues rising, it's not yet peaked.
How to Measure: Always use a digital kitchen scale for accuracy.
Seed Starter: This is the small amount you feed to build the batch you need. Discard or recently fed starter works.
Room Temperature: Warmer temps = faster rise. If not peaking on time, try a warmer spot or adjust your ratio.
Why Tiny Starter: Less flour, less discard, less maintenance, but enough for big bakes.
Rounding: It's fine to round your seed starter/flour/water to the nearest gram.
Baker’s Note: Always save a little starter (10–20g) after mixing for your next feed.
Show Sourdough Starter Tips
Starter Ratio: The numbers in “1:X:X” refer to parts starter, flour, and water (by weight, in grams).

Timing: Your starter is usually ready when it's domed on top and has risen significantly. Mark your jar after feeding and check after several hours; if it continues rising, it's not yet peaked.

How to Measure: Always use a digital kitchen scale for accuracy.

Seed Starter: This is the small amount you feed to build the batch you need. Discard or recently fed starter works.

Room Temperature: Warmer temps = faster rise. If not peaking on time, try a warmer spot or adjust your ratio.

Why Tiny Starter: Less flour, less discard, less maintenance, but enough for big bakes.

Rounding: It's fine to round your seed starter/flour/water to the nearest gram.

Baker’s Note: Always save a little starter (10–20g) after mixing for your next feed.

ESSENTIAL OIL TOOL CALCULATOR

Essential Oil Dilution Calculator

Step 1: Choose container size or enter your own

Preset fills batch size fields below. You can still change them.
Default is 20. Adjust if your dropper is larger/smaller.

Step 2: Choose dilution percentage

1% 2% 3% 5% 6%

Step 3: Calculate

Essential Oil needed: 0.00 tsp (), 0.00 tbsp (), 0.000 fl oz, 0.00 mL, 0 drops
Carrier Oil needed: 0.00 tsp (), 0.00 tbsp (), 0.000 fl oz, 0.00 mL

Optional Tools

Drops ⇄ Volume converter

Volume: 0.00 tsp (), 0.00 tbsp (), 0.000 fl oz, 0.00 mL

Reverse % calculator

Enter your total blend size (carrier + EO together) and the amount of EO you used. This will tell you the % of EO in the blend.
Dilution percent: 0.00%
EO in blend: 0.00 tsp (), 0.00 tbsp (), 0.000 fl oz, 0.00 mL, 0 drops
Carrier oil: 0.00 tsp (), 0.00 tbsp (), 0.000 fl oz, 0.00 mL
Note: Conversions use US measures (1 tsp = 4.92892 mL, 1 tbsp = 14.7868 mL, 1 fl oz = 29.5735 mL). Rounding to the nearest ¼ tsp or tbsp for kitchen use.

Quick Dilution Finder

1% 2% 3% 5% 6%
Selection: 10 mL at 2%
Essential oil: 0 drops • 0.00 tsp () • 0.00 tbsp () • 0.000 fl oz • 0.00 mL
Carrier oil: 0.00 tsp () • 0.00 tbsp () • 0.000 fl oz • 0.00 mL
Tip: adjust “drops per mL” if your dropper gives bigger or smaller drops.