About OvenMath
OvenMath exists for one moment: the recipe says gas mark 4, the oven says °C, the tin is the wrong size, and dinner is in an hour. We are home bakers who got tired of conversion tables that disagree with each other silently, so we built the tools we wanted — converters that show their math, name their sources, and admit where the published authorities disagree instead of averaging the disagreement away.
Everything here runs client-side in your browser. No accounts, no server round-trips for the tools, no input stored. The site is funded by ads and a handful of affiliate links (always marked in the disclosure); the numbers have no sponsor.
Editorial standard
- Verify or drop. Every factual table is checked against a named, published source before it goes live; if a source cannot be verified, the claim is not made.
- Show the disagreement. Where credible sources differ (Delia's gas 3 = 170°C vs BBC Good Food's 160°C; fan reductions of 20°C vs Bosch's ~15°C), we publish both and say so inline.
- Methodology on every tool. The converters state their formulas, rounding conventions and units, and are covered by an automated test suite (127 checks) that pins the math to the cited sources.
- Dated honesty. Factual pages carry “Last verified” dates. Oven guidance is stable, but ovens, pans and websites are not.
Verification log
All sources below were fetched live and verified on 2026-11-16
(all outbound source links on this site are rel="nofollow"):
| Source | Used for |
|---|---|
| Delia Online — Oven temperatures and conversions | Gas mark table (°F/°C pairings), fan −20°C advice, oven-thermometer recommendation |
| BBC Good Food — Conversion guides | Gas ¼–9 with fan column (uniform −20°C), quarter-mark rows, zone labels |
| Bosch Home — What is a convection oven? | Equipment-maker fan rule (~−25°F/−15°C) and 10–25% time reduction |
| King Arthur Baking — The essential alternative baking pan sizes | Pan area table (8″ sq = 64 in², 9×13 = 117…), 9″-round ≈ 8″-square swap, Bundt brim-vs-baking note, glass/stoneware substitution note |
| King Arthur Baking — Recipe success guide | Standard pan sizes assumed by US recipes |
| King Arthur Baking — High-altitude baking guide | Altitude thresholds, +15–25°F, time reduction, leavening chart |
| Colorado State University Extension — High Elevation Food Preparation Guide | Classic altitude authority: 3,000 ft threshold, cake adjustment table by elevation band, yeast/cookie/pastry guidance |
| Sally's Baking Addiction — Cake pan sizes & conversions | Published pan capacities in cups (cross-check for our geometry), ⅔-fill rule, cup equivalences |
What we deliberately do not claim
We are not a testing lab. We do not rate appliances, certify moulds, or benchmark ovens. Where the honest answer is “your oven varies and a thermometer is the arbiter”, we say exactly that — Delia's team does too.
Corrections are welcome and credited: contact us.