Price increase calculator
How much should I raise my price when my costs go up?
Showing for United States
New price
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- Price change
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- Profit per item at the new price
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- Profit per item before
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- Price change (%)
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- Margin kept (% of the price)
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The new price is rounded up to the cent, so you never keep less than before.
Enter the price and costs of one item. If a bill for the whole operation went up, such as feed, divide it by the items it covers first.
New price
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- Price change
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- Profit per item (the same as before)
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- Price change (%)
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- Margin before (% of the price)
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- Margin at the new price (% of the price)
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The new price is rounded up to the cent, so you never keep less than before.
Enter the price and costs of one item. If a bill for the whole operation went up, such as feed, divide it by the items it covers first.
Keeping the same money on each item means your margin, as a percent of the price, gets smaller.
Sales you can lose and earn the same (%; negative means you need more)
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- Items a week you can lose (negative means you need more)
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- Items a week that earn the same profit
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- Profit per item before
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- Profit per item at the new price
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- Profit a week before
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- Profit a week at the new price, if every sale stays
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Enter the price and costs of one item. If a bill for the whole operation went up, such as feed, divide it by the items it covers first.
Profit here is the price less what the item costs you. Costs that stay the same however much you sell, such as a stall rent, are left out.
This shows how many sales you could lose and still be even. It cannot tell you how many customers will stay.
Enter your numbers to see the result.
Planning a farm stand, a CSA or a shop? TallyTill is free to start.
Get started with TallyTill for freeUse this calculator in an AI chat
You can ask Claude, ChatGPT or another AI app to work this out for you, and this calculator opens right inside the chat. You connect TallyTill to your AI app once. It is free, and there is no account and no sign-in.
AI apps call add-ons like this connectors, apps or MCP servers. They all mean the same thing: a way for the AI to use a tool someone else made.
1. Copy this address
2. Add it to your AI app
Claude (claude.ai and the Claude desktop app)
- Open Customize, then Connectors.
- Press + Add, then Add custom connector.
- Name it TallyTill calculators, paste the address and press Continue.
- Under Authentication choose No sign in, then press Add.
- In a new chat, press + at the bottom left, choose Connectors and switch TallyTill calculators on.
On Claude's free plan you can add one custom connector.
ChatGPT
- In Settings, turn on Developer mode. OpenAI moves this switch from time to time; it is usually with the settings for apps and connectors.
- Add a new connector (ChatGPT may call it an app), paste the address and choose No authentication.
- In a new chat, choose TallyTill from the tools menu, or type @ and pick it.
Not every ChatGPT plan lets you add your own connector. If you cannot find the option, your plan may not include it.
Using another AI app? Look in its settings for MCP, add the address as a remote server, and choose no sign-in.
3. Ask your question
Say "use TallyTill", so the AI uses the calculator instead of doing the sum itself. For example:
"Use TallyTill: How much should I raise my price when my costs go up?"
What you will see
- The calculator opens in the chat with the numbers you gave already filled in. Change any number and the answer updates.
- If a number is missing, the box is highlighted, or the AI asks you for it in plain words.
- The answer links back to this page, so you can check the working.
- The first time, your AI app asks if it may use TallyTill. Choose Allow.
The calculators take numbers only. They never ask for your name, your email or a password.
How this is worked out
Your old profit on one item is the old price less the old cost. To keep the same margin percent, the new price is the new cost times the old price divided by the old cost, rounded up to the cent. To keep the same profit per item, the new price is the old price plus the rise in cost, rounded up to the cent. For a new price you choose, the new profit is that price less the new cost, and the share of sales you can lose is the new profit less the old profit, divided by the new profit. The items a week that earn the same are your items a week times the old profit divided by the new profit, rounded up to a whole item.
A worked example
Example numbers only; use your own. You sold a dozen eggs at 5.00 when they cost you 3.00, a margin of 40 percent. Now they cost 3.60. To keep 40 percent, charge 6.00, a rise of 1.00 or 20 percent, and you make 2.40 a dozen. To keep the same 2.00 a dozen, charge 5.60. At 6.00 you could sell 16.67 percent fewer dozens and still earn the same: of 40 a week, 34 earn what 40 did before.
Nothing you type here is saved.