---
title: How To Calculate QPS Limit for Campaign Budget Control
description: Implementing QPS Limit Calculation for Campaign Budget Control
---

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# How To Calculate QPS Limit for Campaign Budget Control

## Implementing QPS Limit Calculation for Campaign Budget Control

### Content

- [Overview](https://help.gamoshi.com/knowledge/how-to-calculate-qps-limit#overview)
- [When to use QPS limits](https://help.gamoshi.com/knowledge/how-to-calculate-qps-limit#When_to_use)
- [QPS calculation formula](https://help.gamoshi.com/knowledge/how-to-calculate-qps-limit#QPS_calculation)
- [Practical example](https://help.gamoshi.com/knowledge/how-to-calculate-qps-limit#Practical_example)
- [Implementation guidelines](https://help.gamoshi.com/knowledge/how-to-calculate-qps-limit#Implemetation)
- [Best practices](https://help.gamoshi.com/knowledge/how-to-calculate-qps-limit#best_practices)
- [Troubleshooting](https://help.gamoshi.com/knowledge/how-to-calculate-qps-limit#troubleshooting)
- [Advanced considerations](https://help.gamoshi.com/knowledge/how-to-calculate-qps-limit#advanced_considerations)

---

### Overview

QPS (Queries Per Second) limits help control campaign spending by restricting the number of bid requests your campaign can participate in per second. This is essential for budget management, especially when you have high traffic volume but low hourly or daily budget caps.

---

### When to Use QPS Limits

**QPS limits are typically needed when:**

- **High traffic volume** campaigns receive many bid requests
- **Low hourly or daily caps** require tight budget control
- **Fast spending** campaigns need pacing throughout the hour
- **Budget overrun protection** is critical for campaign success

**Example scenario:** The campaign receives 1,000+ requests per second but has a $50/hour budget cap.

---

### QPS Calculation Formula

#### Required Information:

1. **Bid Price** (CPM in USD)
2. **Fill Rate** (percentage of requests that become impressions)
3. **Desired Hourly Spend** (maximum budget per hour in USD)

#### Step-by-Step Calculation:

**Step 1: Calculate Cost Per Impression** 

```
Cost Per Impression = Bid Price ÷ 1000
```

 

**Step 2: Calculate Effective Cost Per Request**

```
Cost Per Request = Cost Per Impression × Fill Rate
```

 

**Step 3: Calculate Allowed Requests Per Hour**

```
Requests Per Hour = Hourly Spend ÷ Cost Per Request
```

 

**Step 4: Calculate QPS Limit**

```
QPS Limit = Requests Per Hour ÷ 3600
```

---

### Practical Example

**Campaign Details:**

- Bid Price: $1.80 CPM
- Fill Rate: 15% (0.15)
- Hourly Budget: $20

**Calculation:**

**Step 1:** **Cost per impression**

```
$1.80 ÷ 1000 = $0.0018 per impression
```

 

**Step 2:** **Effective cost per request**

```
$0.0018 × 0.15 = $0.00027 per request
```

 

**Step 3:** **Allowed requests per hour**

```
$20 ÷ $0.00027 = 74,074 requests/hour
```

 

**Step 4:** **QPS limit**

```
74,074 ÷ 3600 = 20.6 QPS
```

 

**Result: Set QPS limit to 21 QPS**

---

### Implementation Guidelines

#### Setting QPS in Campaign Capping

1. Calculate QPS using the formula above
2. Round up to the nearest whole number for a safety margin
3. Set QPS limit in the campaign's Capping tab
4. Monitor spend pacing after implementation

#### Monitoring and Adjustment

**Watch for:**

- **Underspend:** QPS too low, increase limit gradually
- **Overspend:** QPS too high, decrease limit
- **Fill rate changes:** Recalculate when performance shifts

#### Common QPS Ranges

- **Low volume campaigns:** 1-10 QPS
- **Medium volume campaigns:** 10-50 QPS
- **High volume campaigns:** 50-200+ QPS
- **Premium campaigns:** May require 500+ QPS

---

### Best Practices

#### Initial Setup

- **Start conservative:** Use calculated QPS or slightly lower
- **Monitor closely:** Watch spend pacing for the first few hours
- **Adjust gradually:** Make small QPS changes (±10-20%)

#### Ongoing Management

- **Recalculate regularly:** When bid prices or fill rates change
- **Consider time zones:** Peak hours may need different limits
- **Account for weekends:** Lower fill rates may require QPS adjustments

---

### Troubleshooting

**The campaign is not spending enough:**

- Increase QPS limit by 25-50%
- Check if the fill rate assumptions are accurate
- Verify the bid price is competitive

**Campaign overspending:**

- Decrease QPS limit by 10-25%
- Consider tighter hourly caps
- Review if the fill rate is higher than expected

---

### Advanced Considerations

#### Multiple Time Zones

For global campaigns, consider peak traffic hours and adjust QPS accordingly.

#### Seasonal Variations

Fill rates and bid competition change seasonally - recalculate QPS quarterly.

#### Campaign Performance

Higher-performing campaigns may achieve better fill rates, requiring QPS recalculation.

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