Food safety note
This calculator is arithmetic only. Safe cooking depends on food type, thickness, starting temperature, oven accuracy and verified internal temperature. Do not use a percentage adjustment as a safety guarantee for meat, poultry, seafood or reheated food.
Example
A 40-minute bake adjusted upward by 15% becomes 46 minutes. If the oven temperature also changes, use the result as a check-in time rather than a guaranteed finish time.
Common mistakes
Do not assume a hotter oven always saves time evenly. The outside may brown faster while the center remains undercooked, especially for large roasts, bread or dense casseroles.
Limitations
Use thermometer readings and recipe-specific doneness cues for safety-sensitive foods. The calculator does not model food thickness, pan material, fan ovens or altitude.
Last reviewed: 2026-05-17