App builder

Plan entries and exits with a crypto calculator
that counts every fee.

Describe the math you need and Netiva’s AI builds a web app for multi-buy profit and loss, break-even prices, DCA schedules and position sizes — with public calculator pages and code you own.

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Starter prompt

Build a crypto calculator web app for a crypto education site. Include four public calculators: profit and loss across up to 10 buys, each with a price, amount spent and a fee as a percent or flat value; a break-even sell price that covers buy and sell fees; a dollar-cost averaging planner with amount, frequency, start date and number of buys; and a position size calculator from account size, risk percent, entry and stop. Prefill the current price from a market-data API. Give each calculator its own page with an explainer, a worked example and a disclaimer. Signed-in visitors can save scenarios.

Build it in Netiva Paste the prompt into a new workspace and adjust it to your business.
Overview

Who this crypto calculator is for

Most crypto profit calculators take one buy price and one sell price, then leave the fees out. Real positions are built from several buys at different prices, each with its own trading fee, and selling costs a fee too. Traders rebuild the math in spreadsheets, educators paste screenshots into lessons and crypto publishers rely on widgets they can’t adjust. Build the cryptocurrency profit calculator yourself with Netiva and you own it: multi-buy profit and loss, break-even price, dollar-cost averaging and position size sit on your own pages, with fee rates and explanations kept in collections.

Key features

What your crypto calculator can do

  • Profit and loss across several buys

    Enter each buy with its price, amount and fee, then a sell price or the current price from your market-data provider’s API. The finished app shows the average entry, average cost per coin after fees and the net result.

    • Fees as a percent of trade value or a flat amount per buy
    • Average entry price weighted by the coins each buy added
    • Net profit or loss and return after the sell-side fee
    • Quote currency and decimal places set per coin

  • Break-even price and position size

    Work backward from the result you want: the sell price that covers both fees, or the quantity that loses only your chosen share of the account if the stop is hit. Describe each formula and check it in the live preview.

    • Break-even sell price that covers the buy fee and the sell fee
    • Position size from account size, risk percent, entry and stop
    • Reward-to-risk ratio when you add a target price
    • Long and short setups, with a check that the stop sits on the right side

  • Dollar-cost averaging planner

    Set an amount, a frequency and a start date to get a dated schedule of buys. With a price feed connected, the planner replays the schedule against past closing prices and emails reminders before each buy.

    • Weekly, every-two-weeks or monthly schedules with running totals
    • Coins bought per date and average cost from historical closes
    • The DCA result shown next to a single lump-sum buy on day one
    • Reminder email for signed-in visitors before each planned buy

  • Calculator pages with your own explanations

    Each calculator is a record with its explainer, worked example and disclaimer, bound to its own public page. Editors update the copy in the collection grid, and signed-in visitors save scenarios to their account.

    • One page per calculator, plus coin pages prefilled with that coin’s price
    • Disclaimer text shown under every result
    • Saved scenarios that only their owner can open
    • Default fee rates editors can change when an exchange updates its schedule
Data model

The collections behind it

Netiva keeps your records in built-in collections. Here’s a starting structure — the agent adapts it to your prompt, and you can change it any time.

Calculators

Each public calculator, with the copy and defaults your editors keep up to date.

  • Title (required) Text
  • Calculator type (required) Profit and loss, break-even, DCA or position size Text
  • Explainer (required) How the formula works, shown above the inputs HTML
  • Worked example A step-by-step example with round numbers Paragraph
  • Disclaimer (required) Shown under every result Paragraph
  • Default buy fee Percent, prefilled in the fee inputs Number
  • Default sell fee Percent, prefilled in the fee inputs Number
  • Fees checked on When an editor last compared the defaults with exchange fee pages Date

Coins

The coins your calculators support, with a current price used to prefill the inputs.

  • Coin name (required) Text
  • Symbol (required) BTC, ETH, SOL… Text
  • Provider coin ID (required) The coin’s identifier at your market-data provider Text
  • Quote currency (required) USD, EUR, USDT… Text
  • Current price Refreshed by a scheduled job Number
  • Price checked at Date & time
  • Display decimals (required) 8 for BTC, whose smallest unit is the satoshi Number
  • Coin page intro Shown above the prefilled calculator on the coin’s page Paragraph

Scenarios

A saved calculation that belongs to one signed-in visitor.

  • Label (required) Text
  • Owner (required) Filled in from the signed-in visitor Text
  • Calculator (required) Relation to Calculators
  • Coin (required) Relation to Coins
  • Direction Long or short; decides which side the stop must sit on Text
  • Account size In the coin’s quote currency Number
  • Risk percent Share of the account you accept losing if the stop is hit Number
  • Reminders On or off; sends the email the day before each planned buy Text

Scenario rows

The buys, planned buys, sells and price levels inside a scenario, each with its own fee.

  • Scenario (required) Relation to Scenarios
  • Row type (required) Buy, planned buy, sell, entry, stop or target Text
  • Trade date Required for planned buys, which drive the reminder emails Date
  • Price per coin The entry, stop or target level, or a past close when a DCA plan is backtested Number
  • Quote amount Spent on a buy or received on a sell; blank on price-level rows Number
  • Coin quantity Quote amount divided by price, less any fee taken in coin Number
  • Fee value Number
  • Fee basis Percent of trade value or flat amount Text

Required field. Types are Netiva collection field types.

Screens

Pages and screens to start with

A typical first version. Ask the agent for more, or annotate the preview to change any of them.

  • Calculator hub

    Every calculator with a one-line summary, plus a coin picker that opens that coin’s prefilled calculator page.

    Public

  • Profit and loss

    Add buys one row at a time, enter a sell price or use the current one and see average entry, fees paid, net result and break-even price.

    Public

  • DCA planner

    Amount, frequency, start date and number of buys produce a dated schedule; a backtest tab replays it against past closes.

    Public

  • Position size

    Account size, risk percent, entry and stop give the quantity to buy, its value and the reward-to-risk ratio for an optional target.

    Public

  • Coin calculator page

    One page per coin with its current price, the intro copy for that coin and the profit and loss calculator prefilled.

    Public

  • My scenarios

    A signed-in visitor’s saved calculations, reopened with their inputs, with a switch to turn on reminder emails for any DCA plan.

    Signed-in users
How it works

From prompt to a live crypto calculator

  1. Write down the formulas

    Tell Netiva which calculators you want, how your fees are charged and which currency you quote in. The agent drafts collections for calculators, coins, scenarios and scenario rows, then builds the input forms.

  2. Connect a price feed

    Add your market-data provider’s API key, stored securely, and list the coins you support with their provider IDs. The collection assistant can fill symbols and display decimals across many rows at once.

  3. Test with numbers you know

    Run a trade you already worked out by hand through each calculator in the live preview. If a result is off by one fee, annotate the preview and the agent corrects the formula.

  4. Publish and keep the copy current

    Publish in one click, then let editors update explainers and default fee rates in the collection grid. Every change is checkpointed, so a formula edit can be compared with the last version and rolled back.

Why Netiva

Netiva vs a traditional build

Building a crypto calculator with Netiva compared with a traditional build
Criterion With Netiva Traditional build
Fees in the math Buy and sell fees on every row, included in average entry, net result and break-even A spreadsheet that applies the buy fee but forgets the sell fee, copied from tab to tab
Explaining the formula Explainer, worked example and disclaimer kept in a collection and shown beside the live calculator Spreadsheet screenshots pasted into a lesson or article, out of date after one edit
Getting started Describe what you need in chat and watch it take shape in a live preview Hire developers, or stitch together templates, plugins and a hosting plan
Content and data Built-in collections with nine field types, bound straight to your pages Set up and connect a separate database or CMS
Making changes Ask the agent; every change is checkpointed and reversible File a ticket, wait for a sprint, redeploy
Hosting and domain Global hosting and automatic SSL; connect a custom domain from the Starter plan Buy hosting, then install and renew SSL certificates yourself
Code ownership Clean production code you own and can export Locked into a template, plugin or agency setup
Examples

Ways teams use it

  • A swing trader planning each setup

    Before a trade, the trader enters the account size, the risk percent and the stop from the chart. The app returns the quantity to buy and the break-even price after both fees, and the setup is saved as a scenario to review after the exit.

  • An instructor teaching a crypto basics course

    Students open the DCA planner in class, replay a weekly schedule over a past year and compare it with a lump-sum buy. The worked example under each calculator matches the lesson notes, so the screen and the handout agree.

  • A crypto publisher with coin guides

    Each coin guide links to a calculator page prefilled with that coin’s price. Editors keep explainers and disclaimers current in the collection, and readers who sign in find their saved scenarios on the next visit.

Good to know

Before you build

  • Estimates, not advice or tax figures

    Results depend on the prices and fees entered and aren’t investment advice. They aren’t tax figures either: in the US, selling a coin or swapping it for another must be reported, and the gain follows lot rules this calculator doesn’t apply.

  • Fee structures differ by exchange

    Maker and taker rates change with volume tiers, and some exchanges take the buy fee out of the coins you receive instead of adding it to what you pay. Spreads and network withdrawal fees sit outside the rate, so note when each default was checked.

  • Price data comes with terms

    Choose a market-data provider and read its terms: some require attribution or a paid plan before prices appear on a public page, and rate limits decide how often the app can refresh. Past closes for small tokens may be missing.

  • Promotion and disclosure rules for publishers

    Affiliate links to exchanges need a clear FTC disclosure beside the link. The UK’s FCA treats an invitation to invest in cryptoassets as a promotion, so a scheduled reminder to buy can count: restate the visitor’s own saved plan, repeat the risk warning and let them turn it off.

Compliance note

Netiva builds the calculator web app only. It doesn’t mine, hold or move coins, place trades or give investment or tax advice. Prices come from the market-data provider you choose, and every result is an estimate based on the numbers entered, so say that on each calculator page. If you later add anything that handles customer funds or orders, use your own licensed provider and get legal review in your jurisdiction.

FAQ

Questions about building a crypto calculator

How does a cryptocurrency profit calculator handle several buys?

Each buy is a row with its price, the amount spent and its fee. The app adds up the coins each row bought and the amount paid for them, then divides to get the average entry price. Adding the buy fees to that total gives the average cost per coin, which is what break-even works from. Net profit is the sale value after the sell fee, minus everything you paid. Ask the agent to show each step under the result so readers can follow the math.

What formula does the break-even price use?

Break-even is the sell price at which the sale, after its fee, returns exactly what the position cost. Take the coin quantity, reduce it by the sell fee rate, then divide the total cost including buy fees by that number. For 0.5 BTC that cost $30,150 in total and a 0.1% sell fee, break-even is about $60,360 per coin. Spreads and withdrawal fees come on top of that.

Can the DCA planner show how a past schedule would have done?

Yes, if your market-data provider offers historical prices. The backtest buys a fixed amount on each scheduled date at that day’s close, then totals the coins bought and the average cost. Before fees, a fixed amount per buy gives an average cost equal to the harmonic mean of those prices, which never exceeds their simple average. That is a fact about average cost, not a claim that spreading buys out beats investing the same total on day one — over a rising period a lump sum often ends up ahead.

How does the position size calculator decide how much to buy?

It divides the amount you accept losing by the distance from entry to stop. With a $10,000 account, 1% risk, an entry at $100 and a stop at $95, the risk budget is $100 and each coin risks $5, so the size is 20 coins worth $2,000. You can ask for expected fees to come out of the risk budget and for a warning when the stop is on the wrong side.

Can readers use the calculators without signing in?

Yes. The calculator pages are public, so anyone with the link can run the numbers. Visitors who create an account can save scenarios and see only their own, and a saved DCA plan can send a reminder email the day before each planned buy. Netiva builds web apps that open in the browser on phones and desktops with nothing to install, so a link in an article or lesson is all readers need.

Do I own the code behind my crypto calculator?

Yes. The formulas live in framework-standard code that you can read in the code view, edit directly and export at any time, with no proprietary runtime to depend on. Each edit is checkpointed, so a changed fee rule can be compared with the earlier version and rolled back. You can build on the free plan; publishing on your own domain needs the Starter plan or higher.

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Drafted with AI assistance from Netiva’s product pages and reviewed by the Netiva team. Example data models, screens and prompts are illustrative starting points, not customer projects.

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