Sauce Reduction Calculator
Calculate sauce reduction from starting volume and target reduction percent or final volume.
Returns liquid to evaporate and estimated simmer time.
The Science of Sauce Reduction
Reducing a sauce means simmering it until water evaporates, concentrating flavors and thickening the liquid. It’s one of the most fundamental techniques in professional cooking.
What Happens During Reduction
When you simmer a liquid, water molecules escape as steam. The non-water components — sugars, proteins, starches, acids, and fats — stay behind. This concentrates flavor intensity and changes viscosity (thickness).
Common Reduction Targets
| Reduction | Remaining | Use |
|---|---|---|
| By 25% | 75% remains | Light sauce, soups |
| By 33% | 67% remains | Standard wine or stock sauce |
| By half (50%) | 50% remains | Demi-glace, rich pan sauce |
| By two-thirds | 33% remains | Syrup, glaze, balsamic drizzle |
Evaporation Rate
The rate of evaporation depends on:
- Pan surface area: Wider pans evaporate faster than narrow pots
- Heat level: A vigorous simmer evaporates 150–250 ml per minute from a wide sauté pan
- Starting volume: Small volumes reduce faster
Approximate evaporation rate (vigorous simmer, wide pan):
- Wide sauté pan (28–30 cm / 11–12 in): ~200 ml per minute
- Medium saucepan (20 cm / 8 in): ~100 ml per minute
- Small saucepan (16 cm / 6 in): ~50–60 ml per minute
Tips for Perfect Reductions
- Start with cold or room-temperature liquids: add them to the hot pan and bring to a simmer.
- Never add salt until after reduction: the sauce can become over-salted as volume decreases.
- Swirl the pan occasionally to prevent burning on the edges.
- Test thickness by spooning: it should lightly coat the back of a spoon for a sauce consistency.
- Remove from heat just before reaching your target: the sauce continues reducing off-heat.
Metric and Imperial Reference
| Amount | US Cups | Imperial |
|---|---|---|
| 250 ml | 1 cup | ~8.5 fl oz |
| 500 ml | 2 cups | ~17 fl oz |
| 1 liter | 4 cups | ~34 fl oz |
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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