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Create Dynamic WordPress Forms with Real-Time Calculations

Bit Form’s advanced calculation feature lets you build smart, interactive forms with real-time math. Automatically calculate totals, quotes, scores, or estimates based on user input. Ideal for pricing forms, invoices, loan calculators, and more.
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advance calculation in Bit Form

Powerful Smart Tags

Explore Powerful Smart Tags: Pre-built Functions for Easy Data Operations and Advanced Customization,
Including DateTime Difference, Math (Repeater), and More.

DateTime_Difference

The DateTime_Difference smart tag in Bit Form allows you to easily calculate the difference between a start and end date, in terms of years, months, or days. This is perfect for tracking project timelines, subscription periods, or any other date-related data.
Formula:
Datetime_difference(start_date, end_date, "years/months/days")
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Example: 01-01-2024 - 31-12-2024 = 365 days
List your product price. Click + to add more

Math(Repeater)

Need to calculate totals across repeating items like invoices or
orders? Bit Form supports math inside repeater fields, letting you dynamically calculate row-wise and grand totals as users add entries.
Formula:
Math(Repeater)(Product, sum/avg/mul/div/sub)}
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Example: SUM (100, 200, 300) = 600

Add Or subtract_DateTime

The Add or Subtract_DateTime smart tag in Bit Form allows you to dynamically modify date and time values. Whether you're setting due dates, adjusting time zones, or calculating deadlines, this tool makes it easy to add or subtract from any given date or time.
Formula:
${_bf_add_subtract_datetime(Select Date-Time,4,days)}
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Example:${_bf_add_subtract_datetime(09/17/2025,4,days)}
= 09 / 21 /2025

Calculation

Bit Form’s intuitive visual builder lets you set up complex math operations. Simply choose the form fields, apply operators like
+, -, ×, or ÷, and define your formula using a clean, drag and drop interface. Instantly preview results as you build.
Formula:
${_bf_calc(Number A+Number B)}
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Example: ${_bf_calc( 10 + 10)} = 20

Length

The Length smart tag in Bit Form allows you to easily count the number of letters, digits, or symbols entered by a user. This is particularly useful for validating user input, like ensuring a password meets a minimum character count, or counting the length of a message.
Formula:
${_bf_length(Text)}
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Example: ${_bf_length(Bit Form)} = 7
Calculate string and text field lengths

Count

The Count smart tag enables you to track and count the total number of words typed in a text area. This is great for use cases like character limits, counting descriptions, or monitoring how much content a user has provided in forms such as feedback or surveys.
Formula:
${_bf_count(Multi-Line Text)}
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Example: ${_bf_count( Bit Form - The Most Lightweight WordPress Form Builder )} = 8

Real-World Applications

See how advanced calculations solve complex business problems. From simple price totals to complex financial estimates, Bit Form’s
calculation engine lets you automate number crunching directly in your forms, no extra plugins or code required.

Scientific Calculations

Users can create Scientific calculators to simplify complex formulas for engineering, research, and data analysis, helping professionals solve intricate problems with accuracy and efficiency.
Law of Cosines Formula Example :
(Math.sqrt(Math.pow(Length Value(a), 2) + Math.pow(Length Value(b), 2) - 2 * Length Value(a) * Length Value(b) * Math.cos(angle * Math.PI / 180))).toFixed(2)
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JavaScript
Number
Calculation

E-commerce Pricing Calculator

Users can create E-commerce pricing calculators to simplify dynamic pricing calculations, including taxes, discounts, and shipping costs, helping businesses optimize product pricing and maximize profits.
Formula Example :
(Product Price ($)*(1-Discount Percentage (%)/100))*(1+Tax Rate (%)/100)+Shipping Cost ($)
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Number
Calculation

Financial Calculators

Users can create Financial calculators to simplify complex calculations for mortgages, loans, investments, and ROI, helping users make better financial decisions.
Annualized ROI Formula Example :
((Math.pow(Ratio,1/Investment Duration (years)) -1) * 100) .toFixed(2)
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JavaScript
Number
Calculation
Basic ROI Calculator
Annualized ROI Calculator

BMI Calculator Form

Health & Fitness Calculators

Users can create Health & Fitness calculators to simplify complex calculations for BMI, body measurements, calorie intake, and fitness progress, helping users achieve their health and fitness goals.
BMI Formula Example :
((Weight (lbs)/(feet to inch*feet to inch))*703).toFixed(2)
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JavaScript
Number
Calculation

Measurement & Conversion Calculator

Users can create Measurement & Conversion calculators to simplify complex unit conversions for various measurements, helping professionals quickly convert between units with accuracy and ease.
Milimeter to Mile Formula Example :
${_bf_calc(Value/1609344)}
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Number
Calculation

Length Conversion

Electrical Engineering Calculator

Users can create complex electrical calculators for circuits and power systems, including Ohm’s law, impedance, reactance, power factor, and resonance.
Impedance Magnitude Formula Example :
Math.sqrt(Math.pow(resistance, 2) + Math.pow (inductive Reactance - capacitiveReactance, 2));
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JavaScript
Number
Calculation
View All Calculators

More Features to Build Smarter Forms

Unlock the full potential of your WordPress forms with advanced features, responsive design, 50+ integrations, flexible styling, and 45+ smart form fields. Explore all features and functionalities of Bit Form, and see how powerful Bit Form is!
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Frequently Ask Questions

Bit Form's calculations are "advanced" because it goes beyond basic arithmetic, supporting full JavaScript equations, and  complex math functions with conditional logic. This enables you to create sophisticated calculators and dynamic business logic based on user input.

 

Yes! Bit Form supports full JavaScript syntax including Math library functions (Math.pow, Math.sqrt, Math.sin, etc.), conditional statements, and custom functions. You can write complex algorithms directly in your form calculations.

Bit Form includes specialized date/time calculation tags that can calculate differences between dates, add or subtract time periods, calculate ages, project deadlines, and more. Perfect for booking systems, project management forms, and scheduling applications.

Math(repeater) and Concat(repeater) tags allow you to perform operations across multiple rows of data. For example, you can sum all quantities in a repeater, calculate averages, or concatenate text from multiple entries.

No limits! You can create calculations as complex as needed. Our system handles multi-step formulas, nested conditions, array operations, and scientific computations.

We provide a library of common calculation templates, including mortgage calculators, BMI calculators, Pay Raise Calculators, and more. You can use these as starting points and customize them for your specific needs.

Please use our live chat support or email us at [email protected]. You can also join our facebook group and ask any questions.

Bit Form's current plan is now recurring but not mandatory to renew the subscription. If you don't update the subscription after 1 year you can still use the plugin but won't get any future updates.

You will get a refund within 14 days of your purchase time.

Yes, we have affiliate/reseller program where you can earn a 30% commission from every sale. The commission will be for lifetime which means whenever the client upgrades the subscription you will earn a commission. Any developer, blogger, youtuber & freelancer can apply.