The same characters, different quantities
1 h 30 min is 90 minutes or 1.5000 decimal hours. Separately, 1.30 decimal hours is 78 minutes, or 01:18.
Time and capacity
Free Hours and Minutes Decimal Converter
Check a time export's representation before using its quantities. One hour thirty minutes is 1.50 decimal hours; a displayed 1.30 in decimal format means one hour eighteen minutes.
What you can do here
Convert whole hours and minutes to decimal hours, and separately convert entered decimal hours to a duration rounded to the nearest minute.
Built for real invoice workflows
Use the confirmed time representation when preparing approved invoice quantities.
Preparing your calculator with today’s date…
Calculation notes
How the result is calculated
Forward decimal hours = whole hours + minutes ÷ 60. Display to four and two decimals, retaining the original whole-minute duration. Reverse duration = entered decimal hours × 60 rounded to the nearest whole minute, with half-minute values rounded up. Reverse input accepts two decimals. Display rounding can lose precision; these are separate inputs and not an exact round trip.
Formulas and examples reviewed October 2, 2026. Illustrative figures; no tax or contractual determination.
One minute has a repeating decimal
0 h 1 min is 0.0167 hours to four decimals and 0.02 to two. Multiplying the two-decimal display back by 60 does not recreate the exact original minute count.
Questions about this calculation
Does this round up to a billable increment?
No. It converts representations and rounds the reverse result to the nearest minute. Use the actual approved billing operation separately.
Can I enter 90 in the minutes field?
Enter it as one hour and thirty additional minutes. The minutes component is restricted to 0–59 to keep the representation explicit.
How to use it
1
Enter whole hours and minutes from 0–59 for the forward conversion.
2
Enter a separate decimal-hours value for the reverse conversion.
3
Retain original minutes and review the precision accepted by your billing workflow.
Why it helps
Avoid reading decimal fractions as clock minutes.
Show both four- and two-decimal display values.
Keep representation conversion separate from a billing-rounding policy.
Next step
From free tool to live invoice workflow.
Use the result when creating your invoice in InvoiceAgent. Planner setup links carry the settings they describe into a draft. Review your dates, amounts, PDF, and reminder settings before scheduling.
Related workflows
Move from the quick answer into the rest of the invoice system.
Record the export representation
Record the export representation
Preserve source units and transformed quantities.
Check the conversion trail
Check the conversion trail
Resolve format and precision before billing.
Invoice templates
Invoice templates
Use the result inside invoice formats that are ready for clients and easier to automate.
Knowledge base
Knowledge base
Review the billing concepts behind the numbers before they go onto a live invoice.
Profession pages
Profession pages
See how freelancers, consultants, and agencies apply the same calculator output in different workflows.