Request a Calculator — GratisRekenmachine

# Request a Calculator

Looking for a calculation tool that you can't find on GratisRekenmachine? Our engineering team builds new calculators weekly based on community requests.

## What Can We Build?

Our team has built over 100 calculators in 8 languages. We can develop:

**Financial Tools:**
- Country/region-specific tax and VAT calculators
- Loan and mortgage calculators
- Investment and savings calculators
- Salary and net income calculators

**Health & Fitness:**
- Nutrition and macro calculations
- Training and fitness calculators
- Medical dosage calculators
- Biological indicators (TDEE, BMR, etc.)

**Science & Engineering:**
- Chemistry formula calculators
- Technical conversions
- Mathematical functions
- Statistical analysis tools

**Everyday Use:**
- Unit and weight conversions
- Date and time calculations
- Currency conversions
- Construction and DIY calculators

## How to Submit a Request

### Step 1: Describe Your Calculation
Email mijnrekenmachine@gmail.com with:
- **Name:** What should the calculator be called?
- **Inputs:** What numbers or values need to be entered?
- **Output:** What should the result show?
- **Formula:** Do you know the formula? (not required)
- **Use case:** Who benefits? (students, professionals, consumers)

### Step 2: Our Evaluation
Our team evaluates your request on:
- **Popularity:** How many users benefit?
- **Feasibility:** Is the formula scientifically applicable?
- **Availability:** Does a similar tool already exist?
- **Complexity:** How long will development take?

### Step 3: Feedback
You receive a response within 5 business days:
- **Approved:** We build it and send you a link
- **Alternative:** We point you to an existing tool
- **Not feasible:** We explain why

### Step 4: Publication
Approved calculators are built in:
- All 8 supported languages (NL, EN, DE, FR, IT, SV, NO, DA)
- Responsive design (desktop + mobile)
- Full SEO optimization
- Integration into existing categories

## Popular Recent Requests (Built)

These tools were built based on community requests:
- Crypto mining calculator
- Daylight calculation (sunrise/sunset)
- Building material calculator
- CO₂ carbon footprint calculator

## Timeline

| Step | Time |
|------|------|
| Submit request | Day 1 |
| Team evaluation | 5 business days |
| Development | 2-6 weeks |
| Testing & publication | 1 week |
| Total | 3-8 weeks |

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**Ready to request?** Email mijnrekenmachine@gmail.com

Or browse our 100+ existing calculators on the homepage.