# Get Supply Rate

#### Get Supply Rate <a href="#get-supply-rate" id="get-supply-rate"></a>

This function returns the per second supply rate as the decimal representation of a percentage scaled up by `10 ^ 18`. The formula for producing the supply rate is:

```ini
## If the Utilization is less than or equal to the Kink parameter

SupplyRate = supplyPerSecondInterestRateBase + supplyPerSecondInterestRateSlopeLow * utilization

## Else

SupplyRate = supplyPerSecondInterestRateBase + supplyPerSecondInterestRateSlopeLow * supplyKink + supplyPerSecondInterestRateSlopeHigh * (utilization - supplyKink)
```

To calculate the supply APR as a percentage, pass the current utilization to this function, and divide the result by `10 ^ 18` and multiply by the approximate number of seconds in one year and scale up by 100.

```solidity
Seconds Per Year = 60 * 60 * 24 * 365
Utilization = getUtilization()
Supply Rate = getSupplyRate(Utilization)
Supply APR = Supply Rate / (10 ^ 18) * Seconds Per Year * 100
```

* `utilization`: The utilization at which to calculate the rate.
* `RETURNS`: The per second supply rate as the decimal representation of a percentage scaled up by `10 ^ 18`. E.g. `317100000` indicates, roughly, a 1% APR.