Mortgage Rates Calculators

Can someone please explain to repay loans amounting to me?
Hello. Me and my husband crossed swords over how much of a mortgage we can afford to have. The mortgage calculators favor his viewpoint, but I just can not get math to add up, and I think it's because my understanding of mortgage payments is completely wrong. I thought that if you got a mortgage, for example £ 125,000 over 20 years and you had a 10% interest rate you will actually pay back £ 137,500. In this case the monthly payment over 20 years would be about 573 pounds, which we could afford. But the mortgage calculators say that £ 125,000 over 20 years at 10% monthly payment would be £ 1,206 per month, which we most certainly can not afford. If it was £ 1,206 per month in 20 years we would have paid back a total of 289,440 £ on a mortgage of just £ 125,000. I can not get it … Can someone please enlighten me? My head hurts: (Thanks
The calculators entitled, an amortization schedule showing exactly how it works. You pay interest rate on the balance sheet annually, If you look at the 10% rate and 20 year periods. 1% of the total loan amount is pretty close to what the payments will be.