Herbal Tea Calculator
Estimate caffeine, strength, and ideal steep time for any tea. Adjust grams, water, minutes, and temperature. Perfect for herbal, green, black, oolong, white, and rooibos.
Step 1: Choose Tea & Brewing Parameters
☕ Brewing tips
Herbal teas: 100°C, 5‑7 min. Green: 70‑80°C, 2‑3 min. Black: 95°C, 3‑5 min. Adjust to taste. Caffeine estimates are approximate.
Step 2: Display Options
Formulas used
Caffeine = grams × (mg/g) × (time/optimal) × (temp/optimal)
Strength = (time/optimal + temp/optimal) × 2.5 (capped 1‑10)
Tea Brewing Results
Estimated Caffeine
Tea Type Reference
| Tea Type | Caffeine (mg/g) | Optimal °C | Optimal min | Character |
|---|
How To Brew Perfect Tea
Herbal / Tisane
Boiling water (100°C), steep 5‑7 min. Naturally caffeine‑free. Use 1.5‑2g per 250ml.
Green Tea
70‑80°C, steep 2‑3 min. Delicate, vegetal. Caffeine ~15mg/g. Avoid bitterness.
Black Tea
95°C, steep 3‑5 min. Bold, malty. Caffeine ~25mg/g. Common in breakfast blends.
Oolong
85°C, steep 4‑5 min. Semi‑oxidized, floral. Caffeine ~20mg/g.
White Tea
70°C, steep 2‑3 min. Delicate, subtle. Caffeine ~12mg/g.
Rooibos
100°C, steep 5‑6 min. Naturally sweet, caffeine‑free.
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