About IronHearth

A good cast-iron pan outlasts almost everything else in the kitchen, but most of the questions people actually have about it never get a straight numeric answer. How much oil is actually “a thin layer” for seasoning? What oven temperature and how long, really, for a coat to polymerize instead of turning gummy? Will a 10-inch skillet feed the four people coming for dinner, or do you need the 12-inch? How long should a pan sit on the burner before it’s actually hot enough to sear? Is that rust bad enough to need an overnight vinegar soak, or a quick pass with steel wool? And if a recipe was written for a different size pan than the one in your cupboard, how do you scale the ingredients without guessing? None of these are hard questions, but the numbers behind them are scattered across old forums, product inserts, and word of mouth.

IronHearth exists to put real numbers behind cast-iron care instead of folklore. Rather than long articles you have to read end to end, the site is built around a set of small, single-purpose calculators, each aimed at one real task. The Seasoning Oil Amount Calculatorworks out how much oil a thin, even seasoning coat actually needs from your pan’s diameter and wall height. The Seasoning Oven Temp & Time Calculatorpicks an oven temperature from your oil’s smoke point and gives a bake-and-cool schedule for however many coats you’re building. The Skillet Size to Servings Calculatorconverts a skillet’s diameter into a realistic serving count for a skillet meal. The Skillet Preheat Time Calculator estimates how many minutes it takes to bring a pan of a given weight up to searing temperature on gas, electric, or induction. The Rust Removal Plannerturns a rust severity and a method — vinegar soak, salt scrub, or electrolysis — into a soak time, scrub passes, and the number of seasoning coats you’ll need afterward. And the Recipe Scaling Calculator scales ingredient quantities either by desired servings or by the change in cooking-surface area when you move a recipe to a different skillet size.

Beyond the calculators, the blog and learn section cover seasoning, rust care, and cooking technique in plain language, and the Museum of Cast Iron & Hearth Cooking is a browsable collection spanning cast-iron skillets, Dutch ovens, woks, and the history of hearth cooking, with every entry, image, and fact drawn from Wikipedia and Wikimedia Commons.

A few things worth stating plainly. IronHearth is independent and not affiliated with any cookware manufacturer. It is supported by advertising, which is how the tools stay free with no account required. Every result the tools produce — an oil amount, an oven schedule, a serving count, a preheat time, a rust-treatment plan, a scaled quantity — is a general estimate built from standard formulas and the figures you enter, not a guarantee. Cast iron varies by pan, stove, and oil, so treat a result as a solid starting point and adjust from what you observe in your own kitchen. If something looks off in a tool or an article, or you think a calculator is missing that would help, the contact page is the place to say so.