Real math for the homestead.
The Rustic Reckoner for the Modern Homesteader — free calculators for farm, forge, and field. Just the numbers you actually need.

Browse by category
8 calculators
Animal Care
Feed rations, dosing, gestation & more
10 calculators
Gardening & Food
Canning, orchards, syrup & garden planning
10 calculators
Off-Grid & Rural
Solar, water, firewood & equipment sizing
5 calculators
Maker Tools
Leather, dye, glass, steel & wool
3 finders
Finders
Which chicken breed, firewood & starter livestock?
5 tools
Converters & Lookups
Fertilizer, lime, soil rate & firewood cords
Start here
Septic Tank Sizing Calculator
Size a septic tank and drainfield from bedroom count, occupants, and soil perc rate — one of the highest-demand searches homeowners run.
Generator Size Calculator
Figure out what size generator covers your must-run appliances during an outage, from starting watts to running watts.
Backyard Chicken Feed Ration Calculator
Work out how much feed your flock needs by bird count, age, and production stage.
Firewood Cord & BTU Comparator
Compare cord cost against heat output across wood species, so you know what you're really paying per BTU.
All HomesteadCalcs tools
Animal Care
Beehive Box & Frame Count Calculator Beekeeping Sugar Syrup Calculator Backyard Chicken Feed Ration Calculator Dairy Goat Feed-to-Milk-Production Calculator Goat/Sheep Dewormer Dosing Calculator Backyard Quail Housing & Feed Calculator Rabbit Gestation & Litter Due-Date Calculator Acres per Animal Calculator Chicken Coop & Run Size Calculator Honey Yield Calculator Egg Hatch Date CalculatorGardening & Food
Canning & Preserving Altitude Calculator Cider Press Yield Calculator Maple Syrup Sap-to-Syrup Yield Estimator Maple Tree Tap Count Calculator Orchard Tree Spacing & Pollination Calculator Root Cellar Sizing & Storage Planner Seed Saving Isolation Distance Calculator Worm Bin Size & Feed Calculator Garden Yield & Space Calculator Planting Date Calculator Raised Bed Soil Calculator Compost Carbon-to-Nitrogen Ratio Calculator Canning Yield Calculator: Produce per JarOff-Grid & Rural
Firewood Cord & BTU Comparator Fur/Pelt Trapping Value Calculator Rain Barrel / Cistern Sizing Calculator Sawmill Log-to-Board-Feet Calculator Septic Tank / Leach Field Sizing Calculator Tractor PTO Horsepower & Implement Sizing Calculator Water Trough De-Icer Sizing Calculator Well Pump Sizing Calculator Solar & Battery Bank Calculator Generator Size CalculatorNo calculators match your search.
What HomesteadCalcs is for
Homesteading runs on small calculations: how much feed a flock needs, how long to process a jar at your altitude, how big a well pump should be, how many acres a pair of goats can graze. HomesteadCalcs turns published extension and manufacturer guidance into free tools you can use in a minute, and shows the method behind every number so you can check it. Read more on the about page and see how we calculate.
How to find the right tool
Start with what you are trying to decide. If you are choosing a breed, a firewood species or your first animal, use a finder. If you already keep animals, open Animal Care for feed, dosing, housing and breeding numbers. For the garden and the harvest, Gardening & Food covers planting dates, canning at altitude, maple syrup and storage. Off-Grid & Rural covers wells, power, septic, firewood and equipment, and Maker Tools covers leather, dye, glass, steel and wool. Use the converters when a recipe or recommendation is written in a different product or unit than you have. For a start-to-finish walkthrough, read one of our guides on chickens, the garden year, preserving food, off-grid water and power, or heating with wood.
Estimates, not advice
These tools are planning aids. Dosing, canning, septic, electrical and structural decisions belong with a veterinarian, a tested recipe, a licensed installer and your local authorities. Our disclaimer and safety notes explain where to draw that line. If you spot a mistake, please tell us, or get in touch.