Prices shown are approximate. Verify current pricing before purchasing.
King size mattresses are expensive. The same Zinus Green Tea that costs $200 in queen costs $400 in king. The same Saatva that costs $1,200 in queen costs $1,600 in king. The under-$500 king segment is genuinely tight, but viable picks exist.
This guide covers the best king mattresses under $500 with realistic expectations about what you can and cannot get at this price.
Why kings cost more
King mattresses are 76″ x 80″ — 27% more material than queen (60″ x 80″). Manufacturers price proportionally, plus shipping costs are higher (a king mattress in a box is heavier and bulkier than queen). The $200-300 budget that gets you queen mattress comfort gets you king mattress acceptance.
Top king picks under $500
1. Zinus Green Tea 12″ King — ~$300-400
Best king under $500 by a wide margin. Same construction as the queen version (12 inches of layered memory foam), just bigger. Comfortable for couples, ships compressed, fits standard king bed frames.
2. Linenspa 10″ Memory Foam Hybrid King — ~$280-380
Best hybrid king under $500. Pocketed coils plus memory foam. Better edge support than the all-foam Zinus — matters more in king-size where you and your partner each use opposite edges.
Check Current Linenspa Price →
3. Lucid 10″ Gel Memory Foam King — ~$350-450
Step up if the room runs warm. Gel infusion provides better cooling than the standard Zinus. Couples generate more heat, so cooling matters more in king than queen.
4. Zinus 8″ Memory Foam King — ~$220-320
Tightest budget king option. Acceptable for short-term or guest-room use. We do not recommend it as a long-term primary king mattress.
5. Linenspa 8″ Memory Foam King — ~$220-300
Same caveat — thinner profile, shorter realistic lifespan. Best for guest rooms or low-clearance situations.
What you give up at the under-$500 king tier
- Premium foam density: Budget kings use lower-density foam that compresses faster under two-person load. Expect 5-7 years rather than 10+.
- Cooling tech: Standard memory foam without phase-change cooling. Cooling cover models start around $500+ in king.
- Edge support: All-foam king edges compress noticeably. Coil construction at this price is rare and budget-tier.
- Long warranties: 10 years standard. No “Forever” warranties at this tier.
- White-glove delivery: All under-$500 kings ship compressed via Amazon. You handle setup yourself.
When to stretch beyond $500
If your budget can stretch to $700-800, the king mattress quality jump is significant:
- Tuft & Needle Original King (~$650-800): Premium adaptive foam, sleeps cool, 10-year warranty.
- Nectar standard King (~$700-900): Memory foam with cooling cover, 365-night trial, Forever Warranty.
- Linenspa 12″ Memory Foam Hybrid King (~$500-650): Premium budget hybrid with thicker comfort layer.
Cheaper alternatives to upgrading to king
If you are tempted by king but the budget makes queen look better, consider:
- Stay queen with cooling sheets: Cooling bamboo sheets address the heat issue couples face.
- Stay queen with memory foam topper: Adds a luxury layer for $50-100.
- Buy two twin XL mattresses pushed together: Approximates king size, lets each partner pick own firmness. Two Linenspa 8″ Twin XL = ~$200 total. Cheaper than queen.
Bed frame considerations
King bed frames cost more than queen frames. Budget for $100-200 frame on top of mattress purchase. Zinus SmartBase king (~$130) and Amazon Basics steel king (~$80-100) are reliable budget options.
How to pick today
Most under-$500 king buyers: Zinus Green Tea 12″ King (~$350). Best balance of size, comfort, and price. Solid for 5-7 years of couples use.
If you want hybrid: Linenspa 10″ Hybrid King (~$320). Better edge support for couples.
Reminder: Confirm current pricing before purchase.