- 1. BUILT FOR ENGINEERS
- 2. The calculations you need, in the same app you’re filling the certificate
- 3. Gas Rate Calculator
- 4. Gas Pipe Sizing Calculator
- 5. TEST THE CALCULATORS
- 6. Test them online in seconds, then get the GES app
- 7. Gas Rate Calculator
- 8. Gas Pipe Sizing Calculator
- 9. FREE 14-DAY TRIAL
- 10. Get the calculations off your mind
- 11. All-In-One Software For Heating & Plumbing Businesses
- 12. WIN MORE JOBS
- 13. Quotes & Estimates
- 14. GO PAPERLESS
- 15. Records & Certificates
- 16. GET PAID FASTER
- 17. Invoices & Payments
- 18. WORK FASTER ON SITE
- 19. Tools & Calculators
- 20. 2,300+ MANUALS
- 21. Boiler Manuals & AI Assist
- 22. CONNECT YOUR APPS
- 23. Integrations
- 24. STAY ORGANISED
- 25. Scheduling & Calendar
- 26. GET REPEAT BUSINESS
- 27. Automated Reminders
- 28. STREAMLINE WORK
- 29. Job Management
- 30. CRM SOFTWARE
- 31. Customer Management
- 32. EASY ACCESS CONTROL
- 33. User Management
- 34. LOOK PROFESSIONAL
- 35. Custom Workflows
- 36. Frequently asked questions
- 1. BUILT FOR ENGINEERS
- 2. The calculations you need, in the same app you’re filling the certificate
- 3. Gas Rate Calculator
- 4. Gas Pipe Sizing Calculator
- 5. TEST THE CALCULATORS
- 6. Test them online in seconds, then get the GES app
- 7. Gas Rate Calculator
- 8. Gas Pipe Sizing Calculator
- 9. FREE 14-DAY TRIAL
- 10. Get the calculations off your mind
- 11. All-In-One Software For Heating & Plumbing Businesses
- 12. WIN MORE JOBS
- 13. Quotes & Estimates
- 14. GO PAPERLESS
- 15. Records & Certificates
- 16. GET PAID FASTER
- 17. Invoices & Payments
- 18. WORK FASTER ON SITE
- 19. Tools & Calculators
- 20. 2,300+ MANUALS
- 21. Boiler Manuals & AI Assist
- 22. CONNECT YOUR APPS
- 23. Integrations
- 24. STAY ORGANISED
- 25. Scheduling & Calendar
- 26. GET REPEAT BUSINESS
- 27. Automated Reminders
- 28. STREAMLINE WORK
- 29. Job Management
- 30. CRM SOFTWARE
- 31. Customer Management
- 32. EASY ACCESS CONTROL
- 33. User Management
- 34. LOOK PROFESSIONAL
- 35. Custom Workflows
- 36. Frequently asked questions
TOOLS & CALCULATORS FOR GAS ENGINEERS
Speed up your calculations & create certs all in one app
Stop reaching for a separate app or scribbling down your notes. GES has the everyday calculations built right in, so you get the answer where you’re already working.
Speed up your work on the tools:
BUILT FOR ENGINEERS
The calculations you need, in the same app you’re filling the certificate
A gas rate calculator, pipe sizing calculator, and over 2,300 boiler manuals, all only a few taps away.
Gas Rate Calculator
Check an appliance is running at its rated heat input without manual calculations. Punch in the meter reading over your test period and the app returns the gas rate and heat input to add to your certificates.
- Natural gas or LPG, metric or imperial
- 1 or 2 minute test options, or a full dial revolution
- Copy across readings directly into your certificate
- History of all recent results
Gas Rate Calculator
Pipe Sizing Calculator
the 1 mbar limit 0.00 mbar
Gas Pipe Sizing Calculator
Size the optimal piping for a system quickly and easily. Enter the pipe material, length, fittings and the gas rate you need to carry, and the app works out the minimum diameter that keeps you inside the permissible pressure drop.
- Steel and copper pipework, natural gas or LPG
- Automatically accounts for length and fittings
- Section-by-section calculations, with individual and combined results
- Returns a pressure drop for your selected pipe type & checks if its within limits
"I just love that I can access my customer data base from the app. Keeping customer details, boiler info, and work history at my finger tips is so useful."
TEST THE CALCULATORS
Test them online in seconds, then get the GES app
The free versions on our website are perfect in a pinch or to test them out. You’ll find the same calculators integrated in the full GES app to suit your workflow.
FREE 14-DAY TRIAL
Get the calculations off your mind
Focus on getting the job done, with numbers you can trust.
- Gas rate calculator
- Gas pipe sizing calculator
- All gas certificates
- All-in-one heating business platform
TRUSTED BY 7,000+ UK HEATING BUSINESSES
★★★★★
Based on 1500+ reviews
ALL FEATURES
All-In-One Software For Heating & Plumbing Businesses
WIN MORE JOBS
Quotes & Estimates
Create winning quotes in minutes with template line items. Then, convert them to invoices in one click.
GO PAPERLESS
Records & Certificates
All gas industry certificates. In your pocket, for every job.
GET PAID FASTER
Invoices & Payments
Convert quotesto invoices. Complete with easy & low-fee digital payments.
WORK FASTER ON SITE
Tools & Calculators
Gas rate, pipe sizing and more — built into the app, working offline and feeding straight into your certificates.
2,300+ MANUALS
Boiler Manuals & AI Assist
Get any information you need about a boiler in seconds with the GES app.
CONNECT YOUR APPS
Integrations
Save time by sending data to your accounting software and connecting to your analyser.
STAY ORGANISED
Scheduling & Calendar
Manage your jobs & team in one place.
GET REPEAT BUSINESS
Automated Reminders
Send service reminders & chase late payers — without lifting a finger.
STREAMLINE WORK
Job Management
Keep everything together with an activity history for all customers.
CRM SOFTWARE
Customer Management
Keep all of your customer details tidy & in one place.
EASY ACCESS CONTROL
User Management
Give users access to what they need.
LOOK PROFESSIONAL
Custom Workflows
Add your logo to your records, create custom job statuses, and more.
TOOLS & CALCULATORS
Frequently asked questions
Got a question we haven't covered? Talk to our team.
Do the calculators cost extra?
No. They're part of Gas Engineer Software and included on every plan, with full access during your 14-day free trial.
Do I need signal to use them?
No. The calculators run on your device, so they work in remote areas or properties where the mobile signal gives up.
How do you access the calculator in the app?
Tools and calculators are accessible in a couple taps from the main menu. The gas rate calculator can also be accessed while creating a certificate from the quick calculator icon shortcut.
Will my results be automatically added to my certificate?
Yes. If you access the gas rate calculator from the shortcut while creating a certificate, the results will automatically be added for you.
Does the app keep a history of results?
The gas rate calculator will keep a history of your recent results, just in case you want to go back and reference them.
What other tools & calculators does GES have?
Gas Engineer Software also comes with an extensive library of over 2,300 boiler manuals, together with an AI assist feature that helps you pull information you need from them fast. More on boiler manuals and AI Assist.