Tea Brewing Calculator - Steep Time, Temp, and Tea Ratio

A tea brewing calculator is a kitchen tool that turns the tea type and the water volume you plan to use into the exact leaf dose in grams and teaspoons, the right water temperature in Celsius and Fahrenheit, the steep time in minutes and seconds, and an estimated caffeine in milligrams, all from one form.

• • Dial in a single cup: match a teaspoon-and-cup recipe to the per-type leaf mass a small kitchen scale will read in grams.
• • Scale up for a pot: size a 1.5 L pot of black or oolong for a group without over- or under-dosing the leaves.
• • Switch brew styles: compare the same tea in Western, Gongfu, and Cold Brew ratios to find a flavor you like.

The calculator leans on the UK Tea and Infusions Association and Adagio Teas brewing guides for water temperature and steep time, and the Mayo Clinic caffeine table for per-gram caffeine values.

A useful rule of thumb: one rounded teaspoon of dried leaf is about 2 grams, and one 8 fl oz cup is 240 mL, which gives the standard Western 1:120 ratio this calculator uses as its default.

When the rest of the day is built around coffee and the morning brew needs a matching water-to-leaf ratio, Coffee Calculator covers the grams of coffee and water for drip and pour-over so the two drinks stay in step.

Pick a tea type and a water volume, then the calculator returns the leaf dose, the per-type water temperature midpoint, the per-type steep time midpoint, and an estimated caffeine based on the per-type milligrams per gram of leaf.

• teaType: Tea type used to pick the per-type water temperature, steep time, and caffeine per gram.
• waterMl: Water volume in millilitres. The default 240 mL matches one 8 fl oz Western cup.
• brewStyle: Brewing style that switches the leaf-to-water ratio. Western 1:120, Gongfu 1:15, Cold Brew 1:100, Custom uses the customRatio input.
• customRatio: Custom ratio in mL of water per gram of leaf. Used only when 'Custom' brew style is selected.

The per-type temperature and steep time midpoints are derived from the UK Tea and Infusions Association ranges for green, black, and herbal, and the Adagio Teas ranges for white, yellow, oolong, pu-erh, and dark.

The caffeine lookup is the Mayo Clinic per-cup value divided by 2 g of leaf to land on a clean per-gram number, so the formula scales with whatever leaf mass the style ratio produces.

According to UK Tea & Infusions Association, the standard Western measure is 1 rounded teaspoon of leaf per 8 fl oz cup, green tea is brewed at about 80 degrees Celsius, and black tea is brewed at 90 to 98 degrees Celsius for 3 to 5 minutes.

For the cold-brew branch of this tea brewing calculator, Cold Brew Ratio Calculator handles the long-fridge coffee side with the same ratio-then-grams approach so coffee and tea cold brew plans line up.

Four ideas explain why a tea brewing calculator works and where the per-type numbers come from.

These four concepts are the reason the calculator asks for the tea type, the water volume, and the brew style before it returns a result.

If your kitchen scale reads in millilitres first and you want to confirm the leaf mass, ml to Grams Calculator converts mL to grams for dried tea leaves so the 2 g per teaspoon assumption holds up.

Four short steps turn the form into a leaf dose, a temperature, a steep time, and an estimated caffeine in milligrams.

1. 1 Pick a tea type: choose green, white, yellow, oolong, black, pu-erh, dark, or herbal to load the per-type defaults.
2. 2 Set the water volume: enter the millilitres of water you plan to brew, from a 30 mL Gongfu cup to a 3 L pot.
3. 3 Choose a brew style: Western for daily cups, Gongfu for short concentrated steeps, Cold Brew for the fridge, or Custom to set your own mL per gram ratio.
4. 4 Read the leaf dose, temperature, steep time, and caffeine: use grams for precision, teaspoons as a kitchen fallback, the Celsius and Fahrenheit pair for your kettle, the steep time for a timer, and the caffeine row to stay under the 400 mg FDA daily ceiling.

A home brewer wants two cups of black tea for an afternoon. They pick Black tea, set water volume to 480 mL, keep Western style, and the calculator returns 4.0 g of leaf, 2.0 tsp, 98 °C water, a 4 minute steep, and 86 mg of caffeine across the two cups.

When the recipe card lists water in cups or fluid ounces and the kettle is marked in millilitres, Cooking Measurement Converter converts the volume to the mL the calculator expects so the leaf dose matches the actual water.

Using the tea brewing calculator turns a guess-based cup into a per-type recipe with a real caffeine number.

• • Per-type leaf dose: the leafGrams and leafTeaspoons rows give you a single number your kitchen scale or teaspoon measure can read directly.
• • Right water temperature: the temperatureC and temperatureF rows pull the per-type midpoint from the UK Tea and Adagio tables, so green and oolong do not get the same water.
• • Right steep time: the steepTime row is the per-type midpoint in minutes and seconds, or hours and minutes for Cold Brew, so you do not over-steep.
• • Caffeine estimate: the caffeineMg row is leafGrams times the Mayo Clinic per-gram value, so the estimate scales with the actual leaf mass the style ratio produces.
• • Style comparisons: the brewStyle selector lets you compare Western, Gongfu, Cold Brew, and Custom ratios for the same tea without changing the inputs.

When the form returns grams and you only have a teaspoon measure, Grams to Tsp Calculator converts grams of dried leaf back into teaspoons for a quick fallback without a kitchen scale.

Four user-controlled factors and two limitation caveats change what the calculator returns.

• • The temperature, steep time, and caffeine values are midpoints from public brewing tables and do not replace a personal taste test.
• • Caffeine content varies 20 to 30 percent between harvests and brands, so the per-gram numbers are a planning estimate, not a hard lab value.
• • The calculator does not model water alkalinity, leaf grade, or multiple Gongfu steeps, all of which change the actual cup.

According to Adagio Teas, white tea is brewed at 75 to 85 degrees Celsius for 4 to 5 minutes, oolong at 85 to 95 degrees Celsius for 3 to 5 minutes, pu-erh at 95 to 100 degrees Celsius for 3 to 5 minutes, and cold brew is steeped 6 to 12 hours in the refrigerator.

According to Mayo Clinic, an 8 fl oz cup of black tea contains about 47 mg of caffeine, an 8 fl oz cup of green tea contains about 25 mg, an 8 fl oz cup of oolong contains about 38 mg, and an 8 fl oz cup of white tea contains about 15 mg.

For whole-leaf and broken-leaf grades with different packing densities, Ingredient Volume-to-Weight Converter converts a volume of dried leaf into grams so the per-gram caffeine estimate holds up for the specific leaf you bought.