Home › Compare › Kiwi vs Watermelon

🟢 Watermelon VS 🟡 Kiwi

If you're trying to decide between Kiwi and Watermelon for a kidney stone diet, the numbers tell a clear story. Kiwi has 27 mg oxalate vs Watermelon's 1 mg — that's a 27x difference measured by Harvard's lab.

✓ Medically Reviewed Content reviewed by OxalateWatch editorial team. Based on Harvard T.H. Chan SPH oxalate data (2024) and NKF/AUA dietary guidelines.

⚖️ Head-to-Head Comparison

🟢
Watermelon
Safe — Low Oxalate
1 mg oxalate / serving
Serving: 1 slice (280 g)
Per 100 g: 3 mg oxalate
Sodium: 1 mg/100g | Calcium: 7 mg/100g | Protein: 0.6 g/100g
🟡
Kiwi
Caution — Moderate Oxalate
27 mg oxalate / serving
Serving: 1 medium w (76 g)
Per 100 g: 36 mg oxalate
Sodium: — | Calcium: — | Protein: —

🏆 The Verdict: Choose Watermelon

At 1 mg oxalate per serving (rated Safe), Watermelon is the clear winner over Kiwi (27 mg, Caution). The 27x difference comes from Harvard's 2024 lab measurements — this isn't an estimate or guess. Build your meals around Watermelon and use Kiwi sparingly, if at all.

🔍 Key Takeaways

**Oxalate gap:** 27 mg vs 1 mg per serving — a 27x difference. One of these is significantly easier to fit into a kidney stone diet.
**Verdicts:** Kiwi is rated **Caution (25-99 mg/serving)**; Watermelon is rated **Safe (under 25 mg/serving)**.
**Serving strategy:** If you choose Kiwi, consider a half portion or pair it with a calcium source. Watermelon can be eaten more freely.

❓ Frequently Asked Questions

Which is better for kidney stones — Kiwi or Watermelon?

The numbers leave no doubt: Watermelon (1 mg oxalate/serving, Safe) beats Kiwi (27 mg, Caution) by a factor of 27x. For kidney stone patients, Watermelon is the pick. Kiwi is a food to approach with portion awareness.

Can I eat Kiwi and Watermelon together?

You can, but be aware of the math. Together they'd total about 28 mg oxalate — which is manageable for most people. If both are in one meal, the oxalate load adds up. Better strategy: make Watermelon the main component and use Kiwi sparingly.

How should I prepare Kiwi vs Watermelon differently?

Boil and drain Kiwi to cut oxalate. Watermelon can be prepared any way — it's already in the safe zone regardless of cooking method. If making a dish with both, prepare them separately so you can boil the higher-oxalate one.

What are good substitutes if I want to avoid Kiwi?

The obvious swap is Watermelon — same food category, 27x less oxalate. You can also browse the Fruits category on OxalateWatch for other 🟢 Safe options. The key is sticking with foods rated Safe (under 25 mg/serving).

Browse all Fruits 🟢 Low Oxalate Foods Watermelon page Kiwi page
This is dietary reference information, NOT medical advice. Talk to your doctor or a registered dietitian before changing your diet. Oxalate tolerance varies by person, stone type, and medication.