Cooking & Kitchen Calculators

Recipe scaling, cooking times, serving sizes, and ingredient substitution calculators for everyday cooking.

Everyday cooking involves more calculation than most recipes acknowledge. Scaling a recipe from four servings to twelve sounds like simple multiplication, but spices do not scale linearly — doubling cayenne does not produce a dish that tastes twice as spiced. Converting between butter and oil requires adjusting for their different fat and moisture contents. Swapping fresh herbs for dried means using a herb-specific ratio, not a universal rule.

The tools in this section handle these kitchen calculations with the nuance they require. The recipe scaler adjusts ingredient quantities with automatic spice dampening and cooking-friendly fraction rounding. The cooking time scaler recalculates cook times across methods — oven, slow cooker, instant pot, and air fryer — accounting for the different heat transfer characteristics of each appliance.

Substitution calculators cover egg replacements (flax, chia, banana, aquafaba) with guidance on whether each substitute works for binding, leavening, or moisture, and butter-to-oil conversions with fat-percentage adjustments. Ratio tools for grains, pasta, and herbs round out the set with per-variety data rather than one-size-fits-all estimates.

All formulas, ratios, and conversion factors are sourced from published references and tested against known values. Details are on the methodology page.