Whats the difference between Avg Gas Cost per call (BNB) and Avg Gas price (Gwei) like the screenshot i attached

GraphQL API
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Screenshot 2022-01-26 at 6.01.16 PM
Screenshot 2022-01-26 at 6.01.16 PM2490×1244 228 KB

this screenshot is from Binance Smart Chain Mainnet Gas Cost and usage and other analytics.

whats the difference between the two graphs i circled? i thought the difference was just the units (one in Gwei, one in BNB), but when i tried to convert between the two i dont get the same Avg Gas costs per call

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Transaction Average Cost - Gas Cost/Call BNB - This means the average transaction fee in BNB.

Gas Unit Price By Date, GWei - Avg. Gas Price, GWei - This means the average price of per Gas unit in Gwei.

Transaction fee = Gas unit * Gas price per unit