# Banana Bread Kilojoules: The Cafe Slice in kJ | OzCal

> A cafe slice of banana bread is about 1,700 to 2,130 kJ; toasted with two pats of butter about 2,750 kJ. Every serve in kilojoules, and what moves it.

Source: https://ozcal.com.au/kilojoules/banana-bread · Published by OzCal, an Australian nutrition tracking app · Last updated 2026-10-09
Data: FSANZ Australian Food Composition Database (CC BY-SA 3.0 AU), Open Food Facts (ODbL), published chain nutrition panels.
Energy conversion: 1 dietary calorie = 4.184 kilojoules.

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Australian kilojoule guide
# How many kilojoules are in banana bread?
A **thick cafe slice** of banana bread (about 150 g) is about **2,130 kJ (509 Cal)**, and a standard cafe slice about **1,700 kJ**. Toast it and add the **two pats of butter** it usually comes with and you're near **2,750 kJ (657 Cal)**. Australian banana bread runs about **1,300 to 1,470 kJ per 100 g** - closer to cake than to bread. It's the size of the slice and the butter that decide the number, and it's right there in kilojoules on the label.
Key numbers
- Banana bread ~1,300 to 1,470 kJ/100 g (typical ~1,420)
- Thick cafe slice ~2,130 kJ
- Each 10 g pat of butter ~310 kJ
- Toasted thick slice + 2 butters ~2,750 kJ
- Thin supermarket-loaf slice ~1,000 kJ

## Banana bread by the slice

| Serve | Energy | Calories |
|---|---|---|
| Thin supermarket-loaf slice (~70 g) | ~1,000 kJ | 239 Cal |
| Standard cafe slice (~120 g) | ~1,700 kJ | 406 Cal |
| Thick cafe slice (~150 g) | ~2,130 kJ | 509 Cal |
| Thick slice, toasted, 2 pats of butter | ~2,750 kJ | 657 Cal |
| Banana muffin, commercial (~130 g) | ~1,840 kJ | 440 Cal |
| Friand, commercial (~80 g) | ~1,310 kJ | 313 Cal |

## What moves the number

| Add or swap | Change |
|---|---|
| 1 pat of butter (10 g) | ~+310 kJ |
| 2 pats of butter (20 g) | ~+615 kJ |
| Toasting it | about the same kJ |
| Thick slice to a thin one (150 g to 70 g) | ~-1,130 kJ |
| Protein-style loaf vs bakery loaf, per 100 g | ~-300 to -380 kJ |
| Add a large full cream flat white | ~+724 kJ |

## The cafe classic, minus the lecture

- **It's cake wearing a bread name.** Bakery and supermarket banana breads sit around 1,420 kJ per 100 g, about the same as a commercial banana muffin (1,412) or banana cake (1,456). The name just sounds lighter.

- **The slice is the variable.** A thin slice off a supermarket loaf is about 70 g; a cafe slice is often 120 to 150 g, double the size. Same bread, twice the number.

- **The butter is the quiet one.** Butter is about 3,070 kJ per 100 g, so each 10 g pat is about 310 kJ. Two pats add nearly a third again on top of a thick slice.

- **Toasting changes nothing.** It drives off a little water and adds crunch, not kilojoules.

- **Brunch is meant to be nice.** A toasted slice and a large flat white is about 3,470 kJ. Knowing that just means you choose it on purpose, then enjoy it.

### Stop guessing the number

OzCal logs a cafe order in about five seconds: snap it, scan the barcode or search it - or just say "toasted banana bread with butter and a large flat white". Kilojoules the way the label shows them, on 86,832 verified Australian foods.

[See how OzCal works](https://ozcal.com.au/kilojoule-counter-app)
## Common questions
How many kilojoules in a slice of banana bread?A thick cafe slice (~150 g) is about 2,130 kJ; a standard cafe slice (~120 g) about 1,700 kJ; a thin supermarket-loaf slice near 1,000 kJ.
How much does butter add?About 310 kJ a 10 g pat, so two pats is about 615 kJ. Toasted thick slice with two pats: near 2,750 kJ.
Is banana bread lighter than a muffin?About the same per 100 g (both ~1,410 to 1,420 kJ). A 130 g banana muffin is about 1,840 kJ, between a standard and a thick slice.
Does toasting change the kilojoules?No. Toasting removes a little water, not energy. Slice size and the butter move the number.
Is there a lower-kJ banana bread?Protein-style loaves sit near 1,000 to 1,120 kJ per 100 g, against ~1,420 for a bakery loaf. A thinner slice and one pat of butter moves it more.

## Keep reading
[Kilojoules in a flat white](https://ozcal.com.au/kilojoules/flat-white)[Kilojoules in Vegemite toast](https://ozcal.com.au/kilojoules/vegemite-toast)[Kilojoules in a Tim Tam](https://ozcal.com.au/kilojoules/tim-tam)[Kilojoules in a sausage roll](https://ozcal.com.au/kilojoules/sausage-roll)[Kilojoule guides index](https://ozcal.com.au/kilojoules)Citing this page. OzCal (2026). "Banana Bread Kilojoules: The Cafe Slice in kJ | OzCal". Retrieved from [https://ozcal.com.au/kilojoules/banana-bread](https://ozcal.com.au/kilojoules/banana-bread). Last updated 2026-10-09. Figures are per the serve stated in each row, converted at 1 Cal = 4.184 kJ.

**Where these numbers come from:** Banana bread per 100 g is from published Australian bakery and supermarket nutrition panels held in OzCal's catalogue (Coles, Woolworths Bakery, The Country Chef Bakery, 7-Eleven: about 1,300 to 1,470 kJ per 100 g) and the FSANZ AUSNUT entries for commercial banana cake (1,456 kJ), banana muffin (1,412 kJ) and friand (1,635 kJ); butter is the FSANZ entry for salted butter (3,069 kJ per 100 g). Slice weights are typical cafe and supermarket sizes, so serve totals are estimates. Real slices vary a lot by shop, so check the maker's own panel where there is one. Energy converted at 1 Cal = 4.184 kJ. Last updated 2026-10-09.