Frequently Asked Questions
Here you’ll find answers about how DigitalCalculators.net works, how we calculate results, and how to get the most from our finance, health, construction, conversion, date & time, and everyday tools.
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General site questions
Yes. All calculators are free to use with no sign-up, no paywall, and no subscription.
You can open any tool, adjust the inputs, and run as many calculations as you like.
No account is required. Most calculators are designed for quick one-off use.
If you expect to reuse the same tool often, you can simply bookmark pages like the
Mortgage Calculator or
BMI Calculator in your browser.
We currently cover Finance & Money, Health & Fitness,
Construction & DIY, Math & Statistics,
Conversions, Date & Time, and
Other & Everyday tools.
You can see everything on the Calculator Categories page.
Use the search bar on the homepage and start typing the name, for example
“mortgage”, “BMI”, “concrete”, or “time zone”.
You can also browse by category from the main navigation or the
All Calculators overview.
Yes. You may use the results to support your own work, planning, or client projects,
as long as you understand they are for information only and you remain responsible for
any decisions or designs based on those numbers.
No. You can open and refresh calculators as often as you like.
If we ever introduce rate-limiting to protect the service from abuse,
it will not affect normal everyday use.
Yes. If you are missing a specific tool or want a new option added,
send your idea through the Contact Us form.
We prioritise calculators that help many users or extend existing categories.
At the moment we don’t provide official embed codes or iframes.
You may link directly to any calculator page, but copying our code or design
into another site is not allowed without written permission.
DigitalCalculators.net is tested on modern versions of Chrome, Firefox, Edge, and Safari.
Most calculators work well on desktop, tablets, and phones. Very old browsers
or outdated devices may not render some interactive graphics correctly.
We don’t have a dedicated mobile app yet.
However, you can add the website to your home screen on iOS and Android,
which lets you open your favourite calculators like an app icon.
Formulas, data & accuracy
We use standard, widely accepted formulas for each calculator
(for example, Mifflin–St Jeor for calorie estimates and
standard amortisation formulas for loans).
Results are rounded for readability and should be treated as estimates,
not absolute guarantees.
On most calculator pages you’ll find a “How it works”, “Formulas”,
or “Reference” section under the main tool.
These sections outline the equations, assumptions, and links to source material
used for that calculator.
No. Our tools are designed for education and planning only.
Financial calculators do not replace advice from a licensed advisor,
health-related calculators do not replace medical evaluation,
and construction calculators do not replace a qualified engineer.
Professionals may use different assumptions, safety factors, or more detailed data.
For example, a bank might include additional fees, a doctor might adjust
calorie estimates for medical conditions, and a builder may allow extra
materials for waste and offcuts.
We review popular tools regularly and update the logic or content when formulas,
standards, or user feedback suggest improvements.
New calculators and updates are highlighted on the homepage in the
“New & recently updated” section.
Absolutely. If something looks wrong, please send a message via the
Contact Us page and include:
the calculator name, the inputs you used, and the result you expected.
This helps us reproduce and fix the issue quickly.
Finance & money calculators
You can use them to estimate monthly payments, total interest, and payoff timelines.
Always confirm final numbers with your bank or lender because real offers
depend on your credit profile, fees, and local regulations।
By default we typically assume annual compounding, but most compound interest tools
let you change the compounding frequency (annual, monthly, daily, etc.)
to match your bank account or investment product.
Lenders may include extra costs such as insurance, closing fees, or service charges.
They may also round payments differently. Our calculators focus on the core
principal and interest based on the rate and term you enter.
Exchange rates are based on publicly available market data from online providers.
Rates are indicative, not a live trading quote, and your bank or exchange service
may offer slightly different buy/sell rates and fees.
Yes. Any long-term savings goal (house deposit, education fund, etc.) can be tested
by treating it as a “retirement target”.
Just adjust the time horizon, expected returns, and contributions to match your goal.
The salary tools generally focus on gross vs. net salary under common assumptions.
Tax rules and thresholds change by country and over time, so results should be treated
as estimates and double-checked with official calculators or an accountant.
Many finance tools let you quickly re-run scenarios by changing the interest rate,
term, or contribution. For a manual comparison, open the same calculator
in two tabs and enter different values in each tab.
Most financial formulas themselves are currency-agnostic.
As long as you keep all amounts in the same currency, the results hold.
If you need to convert between currencies, use the
Currency Calculator before or after.
Health & fitness calculators
No. These tools use general population formulas and are intended for information only.
They don’t account for all medical conditions, pregnancy, or unique body types.
Always speak to a healthcare professional before making major health or diet changes.
Our calorie-related tools typically include options like Mifflin–St Jeor,
Revised Harris–Benedict, and sometimes Katch–McArdle (if you know your body fat).
You can switch formulas in the calculator and compare the outputs.
Different sites may use different formulas, activity multipliers,
or rounding rules. Even within the same formula, changing your activity level
by one step can create a noticeable difference in daily calorie estimates.
BMI does not differentiate between muscle and fat.
Highly muscular individuals often appear “overweight” on BMI charts even when
their body fat is low. In those cases, the Body Fat Calculator
or professional assessment is more useful.
Read the descriptions beside each activity option and pick the one
that best matches your typical week, not just your most active day.
If you’re unsure, start with a moderate level and adjust based on real-world results.
Some calculators are primarily designed for adults.
Growth patterns in children and teenagers are different, so
parents should consult a paediatrician or dietitian for accurate guidance.
Yes. Most health-related calculators let you switch between kilograms/centimetres
and pounds/feet & inches. Use the unit toggle above the input form
to switch and the tool will convert automatically.
We don’t currently save personal histories.
However, you can record key numbers (BMI, body fat, calories) in a notebook or spreadsheet
and revisit the same calculators weekly or monthly to update your progress.
Construction & DIY calculators
Yes, many contractors use online calculators as a starting point.
However, real-world projects also require professional judgement,
local building codes, and safety margins.
Always double-check quantities and structural assumptions before ordering materials.
Some tools provide a recommended waste percentage, especially for tile, roofing,
and similar materials where offcuts are expected.
You can usually increase the waste margin if your project has many edges, angles,
or complex shapes.
Most construction tools support both metric and imperial units
(for example metres vs. feet, m² vs. ft², cubic metres vs. cubic yards).
The unit selector explains which combination is being used for the calculation.
They are intended as planning aids to estimate spacing, lengths, and quantities.
Structural design must follow local codes and should be reviewed by
a qualified engineer or building professional, especially for safety-critical work.
Calculations are mathematically precise given the dimensions you enter,
but real-world work often involves uneven ground, irregular walls, or cutting losses.
It’s common to round up quantities to the nearest full bag, board, or sheet.
Export buttons are not available yet.
For now, you can print the page, save a PDF from your browser,
or copy the summary into your own spreadsheet or project management software.
Conversion tools
We provide dedicated calculators for area, length, temperature, volume, weight,
speed, and more. You can quickly convert between metric and imperial units
without memorising formulas.
Most tools use fixed, standard conversion factors.
If you need a very specific or unusual conversion (for example, industry-specific units),
you may have to apply your own factor on top of the result.
The Temperature Conversion Calculator uses the standard relationships
between Celsius, Fahrenheit, and Kelvin (for example °F = °C × 9/5 + 32).
You simply enter a temperature and choose the direction of conversion.
Yes. Use the Length, Area, Volume, and Weight Conversion calculators
to move between metres/feet, square metres/square feet, cubic metres/cubic yards,
kilograms/pounds, and more.
Date & time calculators
Use the Date Calculator and select the “Difference” option.
Enter your start and end dates and the tool will show the number of days, weeks,
months, or years between them.
Yes. In the Date Calculator you can choose “Add/Subtract” mode,
pick a starting date, and then add or subtract a number of days, weeks, months, or years.
The result date is calculated for you instantly.
Other & everyday tools
Everyday tools include things like the Tip Calculator,
Dice Roller, Coin Flip,
Random Number Generator, and
Password Generator.
Technical & troubleshooting
First, try refreshing the page or opening it in a different browser.
If it still does not work, please use the Contact Us form
and tell us which calculator, device, and browser you are using so we can investigate.