Cold Brew Tea Calculator: Ratios, Recipes & Steep Times
Ratios, steep times, and brewing tips for green, black, oolong, white, and herbal teas
The standard cold brew tea ratio is 1–2 tea bags (or 1–2 teaspoons of loose leaf) per 8 oz (240ml) of cold water. Lighter teas like green and white need less and a shorter steep — around 2–4 hours. Darker teas like black and herbal need more and a longer steep — 8–12 hours. All cold brew tea is made in the fridge, or at room temperature for a faster result.
What Is Cold Brew Tea?
Cold brew tea is made by steeping tea leaves or bags in cold or room-temperature water for an extended period — typically anywhere from 2 to 12 hours depending on the tea type. No hot water is used at any point.
Cold water extracts tea more slowly and selectively than hot water. The result is a noticeably smoother, sweeter cup with less bitterness and astringency. Many of the sharp tannins and bitter compounds that hot water rapidly releases stay behind when you brew cold, which makes cold brew tea gentler and more forgiving — especially for green teas that are prone to bitterness when brewed hot.
The same basic logic that applies to cold brew coffee applies here: slow extraction, time instead of heat, and a cleaner final flavor profile.
Cold Brew Tea Ratio by Tea Type
Different teas have different densities, flavor intensities, and extraction rates. A ratio that works perfectly for green tea will produce a weak cup of black tea. Use this chart as a starting point, then adjust to your preference.
Naturally sweet and smooth when cold brewed. Don’t over-steep — green tea becomes slightly astringent after 6+ hours.
Very delicate flavor. Cold brewing brings out its subtle floral and fruity notes better than hot water does.
Wide flavor range depending on oxidation level. Light oolongs behave like green tea; darker oolongs behave closer to black tea.
Bolder, more robust flavor. Cold brewing removes the harsh bite that hot-brewed black tea can have. Overnight in the fridge is ideal.
Herbal blends vary widely. Fruity herbals (hibiscus, berry) are forgiving. More delicate blends benefit from a shorter steep.
Matcha doesn’t steep — it dissolves. Whisk with a small amount of cold water first, then add remaining water. Best served immediately.
Tea Bags vs. Loose Leaf for Cold Brew
Tea Bags
Convenient and consistent. Each bag contains a pre-measured amount of tea, making ratio control straightforward.
- Easy to remove after steeping
- No extra equipment needed
- Consistent results batch to batch
- Standard bags: ~2–3g of tea each
Best for: beginners, everyday brewing, convenience
Loose Leaf
More control over quantity and often higher quality tea. Requires a strainer or infuser to remove after steeping.
- More precise measurement by weight
- Often produces more complex flavor
- Better for premium or single-origin teas
- Use 1–2 tsp (2–4g) per 8oz as a starting point
Best for: flavor-focused brewing, experimenting with ratios
Cold Brew Tea Ratio Reference Chart
This table gives a practical at-a-glance reference for the most common cold brew tea setups. Ratios are shown in bags per volume and approximate grams per volume for loose leaf.
| Tea Type | Bags per 8oz (240ml) | Loose Leaf per 8oz | Steep Time (fridge) |
|---|---|---|---|
| Green Tea | 1–2 bags | 1–2 tsp (2–4g) | 2–4 hours |
| White Tea | 1–2 bags | 1–2 tsp (2–4g) | 2–6 hours |
| Oolong Tea Versatile | 2 bags | 2 tsp (3–4g) | 4–8 hours |
| Black Tea Most popular | 2–3 bags | 2–3 tsp (4–6g) | 8–12 hours |
| Herbal Tea | 2–3 bags | 2–3 tsp (4–6g) | 6–12 hours |
Need to scale up for a full pitcher or jar? Use the ratio calculator to convert any tea ratio into exact amounts for your container size.
Open the CalculatorHow to Cold Brew Tea
The process is simple. No special equipment needed beyond a jar or pitcher and your fridge.
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1
Choose your tea and measure your ratio
Use the chart above as a starting point. For your first batch, try black tea at 2 bags per 8oz or green tea at 1–2 bags per 8oz.
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2
Add tea to cold, filtered water
Place tea bags or a loose leaf infuser into a jar or pitcher. Pour cold or room-temperature filtered water over the tea. Give it a gentle stir.
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3
Steep in the fridge
Cover and refrigerate for the time recommended for your tea type — 2–4 hours for green and white, 8–12 hours for black and herbal. Overnight works well for black tea.
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4
Remove the tea and serve
Take out the bags or strain out loose leaf. Serve over ice, or store sealed in the fridge for up to 5 days. Do not leave the tea in the water after steeping — it will continue to extract and can become bitter.
How Long to Cold Brew Tea
Steep time is the second variable after ratio. Unlike ratio, steep time affects extraction depth — how much flavor is pulled from the leaves — rather than concentration.
The good news with cold brew tea is that it’s very forgiving. Because cold water extracts slowly, even leaving most teas an hour or two longer than recommended won’t ruin the batch the way over-steeping in hot water would. Green tea is the main exception — it’s the most delicate and can develop mild astringency if left longer than 6 hours.
As a general rule: shorter steeps produce lighter, more delicate flavors. Longer steeps produce fuller, more complex flavor with slightly more caffeine and tannins. If your cold brew tea tastes too light, steep longer next time before adjusting the ratio.
Fridge vs. Room Temperature
You can cold brew tea either in the fridge or at room temperature. The method affects how long the steep takes.
In the Fridge
The most common approach. Slower extraction means a gentler, cleaner flavor with very low risk of over-steeping. Requires 2–12 hours depending on tea type.
Best for batches you set up before bed and want ready in the morning.
Room Temperature
Faster extraction — roughly 30–50% quicker than fridge steeping. A black tea that takes 10 hours in the fridge may be ready in 5–6 hours at room temp.
Monitor more closely and move to the fridge once it reaches your preferred strength.
Adjusting Cold Brew Tea to Your Taste
Make one batch, taste it, and use these adjustments for the next.
Reduce steep time first. If that doesn’t help, use fewer tea bags or less loose leaf. For green tea specifically, try not exceeding 4 hours.
Steep longer before reducing ratio. Most under-strength cold brew tea is under-steeped, not under-measured. Add another 1–2 hours before changing amounts.
Dilute with cold water at pour time rather than changing the batch. Cold brew tea dilutes cleanly — a splash of water or ice quickly adjusts strength.
Try a slightly higher ratio — one extra bag per batch — and consider using higher-quality loose leaf tea rather than standard tea bags.
How Long Does Cold Brew Tea Last?
Once the tea has been removed, cold brew tea keeps well in the fridge for up to 4–5 days in a sealed container. Flavor is best within the first 2–3 days. After that it stays safe to drink but the more delicate aromatic notes begin to fade.
Unlike cold brew coffee, cold brew tea is generally not made as a concentrate — it’s brewed at drinking strength and served straight. If you want a stronger base to dilute, increase the ratio by 50% and add water or a milk alternative at pour time.
Cold Brew Tea: Common Questions
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What is the cold brew tea ratio?
The standard cold brew tea ratio is 1–2 tea bags (or 1–2 teaspoons of loose leaf) per 8oz (240ml) of cold water. Lighter teas like green and white use the lower end of that range; darker teas like black and herbal use the higher end. Start with 1 bag per 8oz for green tea, and 2 bags per 8oz for black.
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How long do you cold brew tea?
Steep time varies by tea type. Green and white teas: 2–4 hours. Oolong: 4–8 hours. Black and herbal teas: 8–12 hours. Overnight in the fridge (8–10 hours) works well for black tea. Green tea should not steep longer than 6 hours or it can develop astringency.
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Can you cold brew tea?
Yes — cold brewing works with almost all tea types. Cold water extracts more slowly and gently than hot water, producing a naturally smoother, sweeter flavor with less bitterness. It’s particularly effective with green tea, which can taste bitter when brewed hot but becomes very smooth when cold brewed.
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How do you cold brew green tea?
Add 1–2 green tea bags (or 1–2 tsp loose leaf) to 8oz of cold filtered water. Steep in the fridge for 2–4 hours, then remove the tea and serve over ice. Green tea cold brews faster than other types and develops a naturally sweet, clean flavor. Don’t leave it longer than 6 hours.
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Can you use tea bags or does it have to be loose leaf?
Both work well. Tea bags are convenient and easy to remove. Loose leaf often produces a more nuanced flavor and gives you more control over the exact ratio — especially useful if you want to fine-tune by weight. For most batches, tea bags produce a perfectly good result.
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Does cold brew tea have less caffeine than hot-brewed tea?
Cold brew tea generally has a similar or slightly lower caffeine content because cold water extracts caffeine more slowly. The longer steep times used for cold brewing partially compensate for this. Green tea cold brew tends to be moderate in caffeine; black tea cold brew can still be fairly caffeinated depending on steep time and ratio.
More Cold Brew Guides
If you’re also brewing cold brew coffee, the ratio logic is similar — more on that in the cold brew coffee ratio guide. For full brewing instructions including equipment and step-by-step process, see how to make cold brew coffee. For quick answers on common questions, visit the cold brew FAQ page.
Brewing coffee too? Use the cold brew ratio calculator to dial in exact measurements for any jar size or strength preference.
Try the Cold Brew Ratio Calculator Free. Works for any container size or batch amount.