Tools and Calculators
Quick arithmetic for the cellar, the counter, the workshop and the field. Everything runs in your browser; nothing you type is sent anywhere.
Blend calculator
Enter each component’s share and the batch size; get the weight of each.
| Component | % | Weight |
|---|
Weights
Convert between grams, ounces and pounds, the units tins and bulk are sold in.
1 ounce (avoirdupois) = 28.349523125 grams; 1 pound = 16 ounces = 453.59237 grams, the exact legal values set by NIST.
Cost per bowl or per cigar
Weigh a filled bowl once on a kitchen scale for your own grams-per-bowl figure.
Tin age
How long has it rested? Enter the date on the tin or the day you jarred it.
To keep a record of every tin, use My Cellar.
Federal excise tax estimator
For small makers and importers: the federal excise tax on cigars and pipe tobacco at the rates in 26 U.S.C. 5701.
Rates from 26 U.S.C. 5701: small cigars $50.33 per thousand; large cigars 52.75 percent of the sale price, capped at 40.26 cents per cigar; pipe tobacco $2.8311 per pound; roll-your-own $24.78 per pound. An estimate only, not tax advice; how “sale price” is figured for large cigars is defined by TTB rules. Check current rates with TTB.
Plants per acre
For growers: how many transplants you need for your row and plant spacing.
Plants per acre = 43,560 ÷ (row width × in-row spacing ÷ 144), the formula in the University of Kentucky spacing table. More in Grow Your Own Leaf.
These tools give arithmetic, not advice. For adults 21 and older. Page version 1.0, October 2026.